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Simulating \(Z_{2}\) lattice gauge theory with the variational quantum thermalizer EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-03-15 Michael Fromm, Owe Philipsen, Michael Spannowsky, Christopher Winterowd
The properties of strongly-coupled lattice gauge theories at finite density as well as in real time have largely eluded first-principles studies on the lattice. This is due to the failure of importance sampling for systems with a complex action. An alternative to evade the sign problem is quantum simulation. Although still in its infancy, a lot of progress has been made in devising algorithms to address
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On the optimality of quantum circuit initial mapping using reinforcement learning EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-03-13 Norhan Elsayed Amer, Walid Gomaa, Keiji Kimura, Kazunori Ueda, Ahmed El-Mahdy
Quantum circuit optimization is an inevitable task with the current noisy quantum backends. This task is considered non-trivial due to the varying circuits’ complexities in addition to hardware-specific noise, topology, and limited connectivity. The currently available methods either rely on heuristics for circuit optimization tasks or reinforcement learning with complex unscalable neural networks
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Coherent interface between optical and microwave photons on an integrated superconducting atom chip EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-03-13 David Petrosyan, József Fortágh, Gershon Kurizki
Sub-wavelength arrays of atoms exhibit remarkable optical properties, analogous to those of phased array antennas, such as collimated directional emission or nearly perfect reflection of light near the collective resonance frequency. We propose to use a single-sheet sub-wavelength array of atoms as a switchable mirror to achieve a coherent interface between propagating optical photons and microwave
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Hybrid protocols for multi-party semiquantum private comparison, multiplication and summation without a pre-shared key based on d-dimensional single-particle states EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-03-13 Jiang-Yuan Lian, Tian-Yu Ye
In this paper, by utilizing d-dimensional single-particle states, three semiquantum cryptography protocols, i.e., the multi-party semiquantum private comparison (MSQPC) protocol, the multi-party semiquantum multiplication (MSQM) protocol and the multi-party semiquantum summation (MSQS) protocol, can be achieved simultaneously under the assistance of two semi-honest quantum third parties (TPs). Here
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Introductory quantum information science coursework at US institutions: content coverage EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-03-07 Josephine C. Meyer, Gina Passante, Steven J. Pollock, Bethany R. Wilcox
Despite rapid growth of quantum information science (QIS) workforce development initiatives, perceived lack of agreement among faculty on core content has made prior research-based curriculum and assessment development initiatives difficult to scale. To identify areas of consensus on content coverage, we report findings from a survey of N=63 instructors teaching introductory QIS courses at US institutions
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Generalized time-bin quantum random number generator with uncharacterized devices EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-03-05 Hamid Tebyanian, Mujtaba Zahidy, Ronny Müller, Søren Forchhammer, Davide Bacco, Leif. K. Oxenløwe
Random number generators (RNG) based on quantum mechanics are captivating due to their security and unpredictability compared to conventional generators, such as pseudo-random number generators and hardware-random number generators. This work analyzes evolutions in the extractable amount of randomness with increasing the Hilbert space dimension, state preparation subspace, or measurement subspace in
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Digital simulation of convex mixtures of Markovian and non-Markovian single qubit Pauli channels on NISQ devices EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-02-27 I. J. David, I. Sinayskiy, F. Petruccione
Quantum algorithms for simulating quantum systems provide a clear and provable advantage over classical algorithms in fault-tolerant settings. There is also interest in quantum algorithms and their implementation in Noisy Intermediate Scale Quantum (NISQ) settings. In these settings, various noise sources and errors must be accounted for when executing any experiments. Recently, NISQ devices have been
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Designs of the divider and special multiplier optimizing T and CNOT gates EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-02-23 Ping Fan, Hai-Sheng Li
Quantum circuits for multiplication and division are necessary for scientific computing on quantum computers. Clifford + T circuits are widely used in fault-tolerant realizations. T gates are more expensive than other gates in Clifford + T circuits. But neglecting the cost of CNOT gates may lead to a significant underestimation. Moreover, the small number of qubits available in existing quantum devices
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Application of the QDST algorithm for the Schrödinger particle simulation in the infinite potential well EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-02-22 Marcin Ostrowski
This paper examines whether a quantum computer can efficiently simulate the time evolution of the Schrödinger particle in a one-dimensional infinite potential well. In order to solve the Schrödinger equation in the quantum register, an algorithm based on the Quantum Discrete Sine Transform (QDST) is applied. The paper compares the results obtained in this way with the results given by the previous
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Mbit/s-range alkali vapour spin noise quantum random number generators EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-02-19 Matija Koterle, Samo Beguš, Jure Pirman, Tadej Mežnaršič, Katja Gosar, Erik Zupanič, Rok Žitko, Peter Jeglič
Spin noise based quantum random number generators first appeared in 2008 and have since then garnered little further interest, in part because their bit rate is limited by the transverse relaxation time $T_{2}$ which for coated alkali vapour cells is typically in the kbit/s range. Here we present two advances. The first is an improved bit generation protocol that allows generating bits at rates exceeding
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CIRCUS: an autonomous control system for antimatter, atomic and quantum physics experiments EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-02-15 M. Volponi, S. Huck, R. Caravita, J. Zielinski, G. Kornakov, G. Kasprowicz, D. Nowicka, T. Rauschendorfer, B. Rienäcker, F. Prelz, M. Auzins, B. Bergmann, P. Burian, R. S. Brusa, A. Camper, F. Castelli, R. Ciuryło, G. Consolati, M. Doser, L. T. Glöggler, Ł. Graczykowski, M. Grosbart, F. Guatieri, N. Gusakova, F. Gustafsson, S. Haider, M. Janik, G. Khatri, Ł. Kłosowski, V. Krumins, L. Lappo, A. Linek
A powerful and robust control system is a crucial, often neglected, pillar of any modern, complex physics experiment that requires the management of a multitude of different devices and their precise time synchronisation. The AEḡIS collaboration presents CIRCUS, a novel, autonomous control system optimised for time-critical experiments such as those at CERN’s Antiproton Decelerator and, more broadly
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The long mean-life-time-controlled and potentially scalable qubits composed of electric dipolar molecules based on graphene EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-02-12 Yong-Yi Huang
We propose a new kind of qubits composed of electric dipolar molecules. The electric dipolar molecules in an external electric field will take simple harmonic oscillations, whose quantum states belonging to the two lowest energy levels act as the states $|0\rangle$ , $|1\rangle$ of a qubit. The qubits’ excited states have a very long controlled mean life time about several seconds. We can perform quantum
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Nonreciprocal macroscopic tripartite entanglement in atom-optomagnomechanical system EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-01-29 Qianjun Zheng, Wenxue Zhong, Guangling Cheng, Aixi Chen
We investigate how to generate the nonreciprocal macroscopic tripartite entanglement among the atomic ensemble, ferrimagnetic magnon and mechanical oscillator in a hybrid atom-optomagnomechanical system, where an ensemble of two-level atoms and a yttrium iron garnet micro-bridge supporting the magnon and mechanical modes are placed in a spinning optical resonator driven by a laser field. The phonon
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The Quantum Technology Open Master: widening access to the quantum industry EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-01-24 Simon Goorney, Matoula Sarantinou, Jacob Sherson
In this article we conceive of the Open Master, a new form of Transnational Education, as a means of enhancing accessibility to specialist expertise in Quantum Technology. Through participatory action research conducted during the setup and operation of a pan-European pilot project, the QTEdu Open Master (QTOM), we examine the viability of this educational model to offer flexible learning opportunities
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Reinforcement learning assisted recursive QAOA EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-01-17 Yash J. Patel, Sofiene Jerbi, Thomas Bäck, Vedran Dunjko
In recent years, variational quantum algorithms such as the Quantum Approximation Optimization Algorithm (QAOA) have gained popularity as they provide the hope of using NISQ devices to tackle hard combinatorial optimization problems. It is, however, known that at low depth, certain locality constraints of QAOA limit its performance. To go beyond these limitations, a non-local variant of QAOA, namely
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Improved parameter targeting in 3D-integrated superconducting circuits through a polymer spacer process EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-01-11 Graham J. Norris, Laurent Michaud, David Pahl, Michael Kerschbaum, Christopher Eichler, Jean-Claude Besse, Andreas Wallraff
Three-dimensional device integration facilitates the construction of superconducting quantum information processors with more than several tens of qubits by distributing elements such as control wires, qubits, and resonators between multiple layers. The frequencies of resonators and qubits in flip-chip-bonded multi-chip modules depend on the details of their electromagnetic environment defined by the
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ResQNets: a residual approach for mitigating barren plateaus in quantum neural networks EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-01-10 Muhammad Kashif, Saif Al-Kuwari
The barren plateau problem in quantum neural networks (QNNs) is a significant challenge that hinders the practical success of QNNs. In this paper, we introduce residual quantum neural networks (ResQNets) as a solution to address this problem. ResQNets are inspired by classical residual neural networks and involve splitting the conventional QNN architecture into multiple quantum nodes, each containing
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The deterministic pattern matching based on the parameterized quantum circuit EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-01-09 Lu Liu, Xing-Yu Wu, Chu-Yao Xu, Lu-Fan Zhang, Chuan Wang
Grover quantum algorithm is an unstructured search algorithm that can run on a quantum computer with the complexity of O $\sqrt{N}$ , and is one of the typical algorithms of quantum computing. Recently, it has served as a routine for pattern-matching tasks. However, the original Grover search algorithm is probabilistic, which is not negligible for problems involving determinism. Besides that, efficient
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A Rydberg atom-based amplitude-modulated receiver using the dual-tone microwave field EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-01-02 Jinpeng Yuan, Ting Jin, Yang Yan, Liantuan Xiao, Suotang Jia, Lirong Wang
We propose a Rydberg atom-based receiver for amplitude-modulation (AM) reception utilizing a dual-tone microwave field. The pseudo-random binary sequence (PRBS) signal is encoded in the basic microwave field (B-MW) at the frequency of 14.23 GHz. The signal can be decoded by the atomic receiver itself but more obvious with the introduction of an auxiliary microwave (A-MW) field. The receiver’s amplitude
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Soft-controlled quantum gate with enhanced robustness and undegraded dynamics in Rydberg atoms EPJ Quantum Technol. (IF 5.3) Pub Date : 2024-01-02 Qiaolin Wu, Jun Xing, Hongda Yin
Rydberg atoms have exhibited excellent potentials to become a competent platform of implementing quantum computation, which demands to execute various quantum gates fast and faithfully. We propose a dynamic mechanism of two interacting Rydberg atoms for implementing a high-fidelity SWAP gate on ground-state manifolds, where the amplitude modulation and soft quantum control of lasers driving ground-Rydberg
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Secret key rate bounds for quantum key distribution with faulty active phase randomization EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-12-15 Xoel Sixto, Guillermo Currás-Lorenzo, Kiyoshi Tamaki, Marcos Curty
Decoy-state quantum key distribution (QKD) is undoubtedly the most efficient solution to handle multi-photon signals emitted by laser sources, and provides the same secret key rate scaling as ideal single-photon sources. It requires, however, that the phase of each emitted pulse is uniformly random. This might be difficult to guarantee in practice, due to inevitable device imperfections and/or the
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Improvement of response bandwidth and sensitivity of Rydberg receiver using multi-channel excitations EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-11-28 Jinlian Hu, Yuechun Jiao, Yunhui He, Hao Zhang, Linjie Zhang, Jianming Zhao, Suotang Jia
We investigate the response bandwidth of a superheterodyne Rydberg receiver at a room-temperature vapor cell, and present an architecture of multi-channel lasers excitation to increase the response bandwidth and keep sensitivity, simultaneously. Two microwave fields, denoted as a local oscillator (LO) $E_{\text{LO}}$ and a signal field $E_{\text{SIG}}$ , couple two Rydberg states transition of $|52D_{5/2}\rangle
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Vector—towards quantum key distribution with small satellites EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-11-28 Alexander V. Miller, Liubov V. Pismeniuk, Alexey V. Duplinsky, Vitaly E. Merzlinkin, Aleksandr A. Plukchi, Kseniia A. Tikhonova, Ivan S. Nesterov, Dmitry O. Sevryukov, Sergey D. Levashov, Vladimir V. Fetisov, Sergei V. Krasnopejev, Ruslan M. Bakhshaliev
A satellite-constellation based global quantum network could allow secure quantum communication between remote users worldwide. Such a constellation could be formed of micro- or even nanosatellites, which have the advantage of being more cost-effective than larger expensive spacecrafts. At the same time, the features of quantum communication impose a number of technical requirements that are more difficult
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Demonstration of 75 km-fiber quantum clock synchronization in quantum entanglement distribution network EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-11-22 Bang-Ying Tang, Ming Tian, Huan Chen, Hui Han, Han Zhou, Si-Chen Li, Bo Xu, Rui-Fang Dong, Bo Liu, Wan-Rong Yu
The quantum entanglement distribution network, serviced as the communication infrastructure which distributes quantum information among remote users, enables many applications beyond the reach of classical networks. Recently, the applications such as quantum key distribution and quantum secure direct communication, have been successfully demonstrated in the quantum entanglement distribution network
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Effect of external magnetic fields on practical quantum random number generator EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-11-20 Yuan-Hao Li, Yang-Yang Fei, Wei-Long Wang, Xiang-Dong Meng, Hong Wang, Qian-Heng Duan, Yu Han, Zhi Ma
Quantum random number generator (QRNG) based on the inherent randomness of fundamental quantum processes can provide provable true random numbers which play an important role in many fields. However, the security of practical QRNGs is linked to the performance of realistic devices. In particular, devices based on the Faraday effect in a QRNG system may be affected by external magnetic fields, which
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Mutual entity authentication of quantum key distribution network system using authentication qubits EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-11-15 Hojoong Park, Byung Kwon Park, Min Ki Woo, Min-Sung Kang, Ji-Woong Choi, Ju-Sung Kang, Yongjin Yeom, Sang-Wook Han
Entity authentication is crucial for ensuring secure quantum communication as it helps confirm the identity of participants before transmitting any confidential information. We propose a practical entity authentication protocol for quantum key distribution (QKD) network systems that utilizes authentication qubits. In this protocol, authentication qubits that are encoded with pre-shared information
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Determination of the number of shots for Grover’s search algorithm EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-11-08 Mathieu Kessler, Diego Alonso, Pedro Sánchez
This paper focuses on Grover’s quantum search algorithm, which is of paramount importance as a masterpiece of Quantum Computing software. Given the inherent probabilistic nature of quantum computers, quantum programs based on Grover’s algorithm need to be run a number of times in order to generate a histogram of candidate values for solutions, which are then checked to identify the valid ones. In this
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Multiple electron pumping EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-10-31 Mark D. Blumenthal, Declan Mahony, Salahuddeen Ahmad, Dominique Gouveia, Hume Howe, Harvey E. Beere, Thomas Mitchel, Dave A. Ritchie, Michael Pepper
The need to pump single electrons with a high degree of accuracy and fidelity has led to the development of a range of different pump and turnstile designs. Previous pumping mechanisms have all demonstrated that pumping more than one electron per cycle degrades the quantisation of the measured current. This unreliable delivery of multiple electrons per cycle has limited the use of on-demand single
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Soft syndrome iterative decoding of quantum LDPC codes and hardware architectures EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-10-19 Nithin Raveendran, Javier Valls, Asit Kumar Pradhan, Narayanan Rengaswamy, Francisco Garcia-Herrero, Bane Vasić
In practical quantum error correction implementations, the measurement of syndrome information is an unreliable step—typically modeled as a binary measurement outcome flipped with some probability. However, the measured syndrome is in fact a discretized value of the continuous voltage or current values obtained in the physical implementation of the syndrome extraction. In this paper, we use this “soft”
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Improving quantum annealing by engineering the coupling to the environment EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-10-16 Mojdeh S. Najafabadi, Daniel Schumayer, Chee-Kong Lee, Dieter Jaksch, David A. W. Hutchinson
A large class of optimisation problems can be mapped to the Ising model where all details are encoded in the coupling of spins. The task of the original mathematical optimisation is then equivalent to finding the ground state of the corresponding spin system which can be achieved via quantum annealing relying on the adiabatic theorem. Some of the inherent disadvantages of this procedure can be alleviated
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Multi-bit quantum random number generator from path-entangled single photons EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-10-13 K. Muhammed Shafi, Prateek Chawla, Abhaya S. Hegde, R. S. Gayatri, A. Padhye, C. M. Chandrashekar
Measurement outcomes on quantum systems exhibit inherent randomness and are fundamentally nondeterministic. This has enabled quantum physics to set new standards for the generation of true randomness with significant applications in the fields of cryptography, statistical simulations, and modeling of the nondeterministic behavior in various other fields. In this work, we present a scheme for the generation
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Correction: Optimising the quantum/classical interface for efficiency and portability with a multi-level hardware abstraction layer for quantum computers EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-10-11 Kenton M. Barnes, Anton Buyskikh, Nicholas Y. Chen, Gabriel Gallardo, Marco Ghibaudi, Matthew J. A. Ruszala, Daniel S. Underwood, Abhishek Agarwal, Deep Lall, Ivan Rungger, Nikolaos Schoinas
Correction: EPJ Quantum Technol. 10, 36 (2023) https://doi.org/10.1140/epjqt/s40507-023-00192-z Following publication of the original article [1], it was noticed that the author name Ivan Rungger was incorrectly written as Ivan Runggar. The author group has been updated above and the original article has been corrected. Barnes KM, Buyskikh A, Chen NY et al.. Optimising the quantum/classical interface
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Performance of high impedance resonators in dirty dielectric environments EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-10-06 J. H. Ungerer, D. Sarmah, A. Kononov, J. Ridderbos, R. Haller, L. Y. Cheung, C. Schönenberger
High-impedance resonators are a promising contender for realizing long-distance entangling gates between spin qubits. Often, the fabrication of spin qubits relies on the use of gate dielectrics which are detrimental to the quality of the resonator. Here, we investigate loss mechanisms of high-impedance NbTiN resonators in the vicinity of thermally grown SiO2 and Al2O3 fabricated by atomic layer deposition
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Information reconciliation of continuous-variables quantum key distribution: principles, implementations and applications EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-10-06 Shenshen Yang, Zhilei Yan, Hongzhao Yang, Qing Lu, Zhenguo Lu, Liuyong Cheng, Xiangyang Miao, Yongmin Li
Quantum key distribution (QKD) can provide information-theoretically secure keys for two parties of legitimate communication, and information reconciliation, as an indispensable component of QKD systems, can correct errors present in raw keys based on error-correcting codes. In this paper, we first describe the basic knowledge of information reconciliation and its impact on continuous variable QKD
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Quantum scaling atomic superheterodyne receiver EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-10-03 Peng Zhang, Mingyong Jing, Zheng Wang, Yan Peng, Shaoxin Yuan, Hao Zhang, Liantuan Xiao, Suotang Jia, Linjie Zhang
Measurement sensitivity is one of the critical indicators for Rydberg atomic radio receivers. This work quantitatively studies the relationship between the atomic superheterodyne receiver’s sensitivity and the number of atoms involved in the measurement. The atom number is changed by adjusting the length of the interaction area. The results show that for the ideal case where only interaction noise
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Demonstration of a switched CV-QKD network EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-09-21 Hans H. Brunner, Chi-Hang Fred Fung, Momtchil Peev, Rubén B. Méndez, Laura Ortiz, Juan P. Brito, Vicente Martín, José M. Rivas-Moscoso, Felipe Jiménez, Antonio A. Pastor, Diego R. López
A quantum channel is a physical media able to carry quantum signals. Quantum key distribution (QKD) requires direct quantum channels between every pair of prepare-and-measure modules. This requirement heavily compromises the scalability of networks of directly connected QKD modules. A way to avoid this problem is to introduce switches that can dynamically reconfigure the set of connections. The reconfiguration
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A stochastic evaluation of quantum Fisher information matrix with generic Hamiltonians EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-09-19 Le Bin Ho
Quantum Fisher information matrix (QFIM) is a fundamental quantity in quantum physics, which closely links to diverse fields such as quantum metrology, phase transitions, entanglement witness, and quantum speed limit. It is crucial in quantum parameter estimation, central to the ultimate Cramér-Rao bound. Recently, the evaluation of QFIM using quantum circuit algorithms has been proposed for systems
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Optimising the quantum/classical interface for efficiency and portability with a multi-level hardware abstraction layer for quantum computers EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-09-13 Kenton M. Barnes, Anton Buyskikh, Nicholas Y. Chen, Gabriel Gallardo, Marco Ghibaudi, Matthew J. A. Ruszala, Daniel S. Underwood, Abhishek Agarwal, Deep Lall, Ivan Runggar, Nikolaos Schoinas
Steady progress is being made in the development of quantum computing platforms based on different types of qubit technologies. Each platform requires bespoke strategies to maximise the efficiency of the quantum/classical interface when operating close to the qubits. At a higher level, however, a shared interface allowing portability of quantum algorithms across all the available quantum platforms
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Quantum authentication method based on key-controlled maximally mixed quantum state encryption EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-09-13 Na-Hee Lim, Ji-Woong Choi, Min-Sung Kang, Hyung-Jin Yang, Sang-Wook Han
Quantum authentication is a fundamental first step that ensures secure quantum communication. Although various quantum authentication methods have been proposed recently, their implementation efficiency is limited. This paper proposes a key-controlled maximally mixed quantum state encryption (MMQSE) method using only a single qubit, unitary operation, minimized quantum transmissions, and a single qubit
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Simultaneous cooling and synchronization of the mechanical and the radio-frequency resonators via voltage modulation EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-09-11 Liang Wang, Wei Zhang, Shutian Liu, Shou Zhang, Hong-Fu Wang
We explore the ground state cooling and quantum synchronization of the mechanical and low-frequency inductor-capacitor (LC) resonators in a hybrid three-mode optoelectromechanical system, in which the mechanical resonator is optically and capacitively coupled to the optical cavity and the LC circuit, respectively. We find that when the bias voltage modulation switch is incorporated into the direct
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Arbitrary bias control of LiNbO3 based Mach-Zehnder intensity modulators for QKD system EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-09-07 Jun Teng, Shuang Wang, Zhen-Qiang Yin, Wei Chen, Guan-Jie Fan-Yuan, Guang-Can Guo, Zheng-Fu Han
Quantum key distribution (QKD) can help distant agents to share unconditional secret keys, and the achievable secret key rate can be enhanced with the help of decoy-state protocol. To implement QKD experimentally, the agents are supposed to accurately transmit a number of different intensity pulses with the LiNbO3 based Mach-Zehnder (LNMZ) intensity modulator. However, the bias drift of LNMZ intensity
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Neutral atom quantum computing hardware: performance and end-user perspective EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-08-28 Karen Wintersperger, Florian Dommert, Thomas Ehmer, Andrey Hoursanov, Johannes Klepsch, Wolfgang Mauerer, Georg Reuber, Thomas Strohm, Ming Yin, Sebastian Luber
We present an industrial end-user perspective on the current state of quantum computing hardware for one specific technological approach, the neutral atom platform. Our aim is to assist developers in understanding the impact of the specific properties of these devices on the effectiveness of algorithm execution. Based on discussions with different vendors and recent literature, we discuss the performance
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Dihedral lattice gauge theories on a quantum annealer EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-08-25 Michael Fromm, Owe Philipsen, Christopher Winterowd
We study lattice gauge theory with discrete, non-Abelian gauge groups. We extend the formalism of previous studies on D-Wave’s quantum annealer as a computing platform to finite, simply reducible gauge groups. As an example, we use the dihedral group $D_{n}$ with $n=3,4$ on a two plaquette ladder for which we provide proof-of-principle calculations of the ground-state and employ the known time evolution
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A study of polarization compensation for quantum networks EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-08-17 Matej Peranić, Marcus Clark, Rui Wang, Sima Bahrani, Obada Alia, Sören Wengerowsky, Anton Radman, Martin Lončarić, Mario Stipčević, John Rarity, Reza Nejabati, Siddarth Koduru Joshi
The information-theoretic unconditional security offered by quantum key distribution has spurred the development of larger quantum communication networks. However, as these networks grow so does the strong need to reduce complexity and overheads. Polarization-based entanglement distribution networks are a promising approach due to their scalability and no need for trusted nodes. Nevertheless, they
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Efficient multiparty quantum secret sharing based on a novel structure and single qubits EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-08-01 Shu-Yu Kuo, Kuo-Chun Tseng, Chia-Ching Yang, Yao-Hsin Chou
Quantum secret sharing (QSS) is a significant branch of quantum cryptography and can be widely used in various applications. Quantum secret sharing schemes can be developed by utilizing different features of quantum mechanics, and quantum secure direct communication (QSDC) is an effective way to achieve secret sharing using single qubits. The utilization of QSDC offers certain benefits, such as low
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Microwave electrometry with bichromatic electromagnetically induced transparency in Rydberg atoms EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-07-14 Mingzhi Han, He Hao, Xiaoyun Song, Zheng Yin, Michal Parniak, Zhengmao Jia, Yandong Peng
A scheme for measuring microwave (MW) electric (E) fields is proposed based on bichromatic electromagnetically induced transparency (EIT) in Rydberg atoms. A bichromatic control field drives the excited state transition, whose absorption shows three EIT windows. When a MW field drives the Rydberg transition, the EIT windows split and six transmission peaks appear. It is interesting to find that the
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Modular source for near-infrared quantum communication EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-07-12 Federico Berra, Costantino Agnesi, Andrea Stanco, Marco Avesani, Sebastiano Cocchi, Paolo Villoresi, Giuseppe Vallone
We present a source of states for Quantum Key Distribution (QKD) based on a modular design exploiting the iPOGNAC, a stable, low-error, and calibration-free polarization modulation scheme, for both intensity and polarization encoding. This source is immune to the security vulnerabilities of other state sources such as side channels and some quantum hacking attacks. Remarkably, our intensity modulation
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Quantum encryption in phase space with displacement operators EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-06-29 Randy Kuang, Adrian Chan
In photonic computing, the quantum systems consist of coherent states and squeezed coherent states. Common quantum gates found in these systems are: phase shift, displacement, and squeezing gates. These gates are all unitary and reversible. Outside of quantum systems, coherent states also plays a significant role in coherent optical communications with speeds of hundreds of gigabits per second. Secure
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Optimal quantum state tomography with noisy gates EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-06-28 Violeta N. Ivanova-Rohling, Niklas Rohling, Guido Burkard
Quantum state tomography (QST) represents an essential tool for the characterization, verification, and validation (QCVV) of quantum processors. Only for a few idealized scenarios, there are analytic results for the optimal measurement set for QST. E.g., in a setting of non-degenerate measurements, an optimal minimal set of measurement operators for QST has eigenbases which are mutually unbiased. However
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Quantum adversarial metric learning model based on triplet loss function EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-06-27 Yan-Yan Hou, Jian Li, Xiu-Bo Chen, Chong-Qiang Ye
Metric learning plays an essential role in image analysis and classification, and it has attracted more and more attention. In this paper, we propose a quantum adversarial metric learning (QAML) model based on the triplet loss function, where samples are embedded into the high-dimensional Hilbert space and the optimal metric is obtained by minimizing the triplet loss function. The QAML model employs
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Local oscillator port embedded field enhancement resonator for Rydberg atomic heterodyne technique EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-06-26 Kai Yang, Ruiqi Mao, Li He, Jiawei Yao, Jianbing Li, Zhanshan Sun, Yunqi Fu
Rydberg atom-based sensors using the atomic heterodyne technique demonstrate prominent performance on sensing sensitivity and thus have significant potential for radar, electronic reconnaissance, and communication applications. Here, we propose a local oscillator (LO) embedded field enhancement resonator to improve the sensitivity and integration of Rydberg atomic heterodyne sensors. In this approach
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Automated verification of countermeasure against detector-control attack in quantum key distribution EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-06-26 Polina Acheva, Konstantin Zaitsev, Vladimir Zavodilenko, Anton Losev, Anqi Huang, Vadim Makarov
Attacks that control single-photon detectors in quantum key distribution using tailored bright illumination are capable of eavesdropping the secret key. Here we report an automated testbench that checks the detector’s vulnerabilities against these attacks. We illustrate its performance by testing a free-running detector that includes a rudimentary countermeasure measuring an average photocurrent. While
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Security and application of semi-quantum key distribution protocol for users with different quantum capabilities EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-06-20 Chong-Qiang Ye, Jian Li, Xiu-Bo Chen, Yanyan Hou, Zhuo Wang
Semi-quantum protocols serve as a bridge between quantum users and “classical” users with limited quantum capabilities, providing support for application scenarios that cannot afford the excessively high cost of quantum resources. In this paper, we present a semi-quantum key distribution (SQKD) protocol based on Bell states and single particles, which is designed for key distribution between different
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Impact of transmitter imbalances on the security of continuous variables quantum key distribution EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-06-14 Daniel Pereira, Margarida Almeida, Armando N. Pinto, Nuno A. Silva
Continuous-variable quantum key distribution (CV-QKD) provides a theoretical unconditionally secure solution to distribute symmetric keys among users in a communication network. However, the practical devices used to implement these systems are intrinsically imperfect, and, as a result, open the door to eavesdropper attacks. In this work, we study the impact of transmitter stage imperfections on the
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Dissipative generation of significant amount of photon-phonon asymmetric steering in magnomechanical interfaces EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-06-08 Tian-Ang Zheng, Ye Zheng, Lei Wang, Chang-Geng Liao
A theoretical scheme is proposed to generate significant amount of photon-phonon entanglement and asymmetric steering in a cavity magnomechanical system, which is constituted by trapping a yttrium iron garnet sphere in a microwave cavity. By applying a blue-detuned microwave driving field, we obtain an effective Hamiltonian where the magnon mode acting as an engineered resevoir cools the Bogoliubov
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Decoy state semi-quantum key distribution EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-05-31 Shuang Dong, Shang Mi, Qingcheng Hou, Yutao Huang, Jindong Wang, Yafei Yu, Zhengjun Wei, Zhiming Zhang, Junbin Fang
Semi-quantum key distribution describes a system in which a fully quantum user and classical user perform key distribution. The main advantage of key distribution is its security. Owing to the bottlenecks of existing technology, highly attenuated lasers and threshold detectors are required for semi-quantum key distribution; however, these components make semi-quantum key distribution susceptible to
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A quantum circuit to generate random numbers within a specific interval EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-05-25 Francisco Orts, Ernestas Filatovas, Ester M. Garzón, Gloria Ortega
Random numbers are of vital importance in fields such as cyptography and scientific simulations. However, it is well known how difficult it is for classical computers to generate random numbers. This is not the case for quantum computers, which are able to genuinely generate random numbers thanks to the property of superposition and their counter-intuitive concept of measurement. However, despite the
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Ancilla-driven blind quantum computation for clients with different quantum capabilities EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-05-23 Qunfeng Dai, Junyu Quan, Xiaoping Lou, Qin Li
Blind quantum computation (BQC) allows a client with limited quantum power to delegate his quantum computational task to a powerful server and still keep his input, output, and algorithm private. There are mainly two kinds of models about BQC, namely circuit-based and measurement-based models. In addition, a hybrid model called ancilla-driven universal blind quantum computation (ADBQC) was proposed
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Parametric controllable one-way quantum steering induced by four-wave mixing in cavity magnonics EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-05-19 Nan Wang, Zhi-Bo Yang, Shi-Yan Li, Ting-Ting Dong, Ai-Dong Zhu
Quantum steering plays a crucial role in quantum communication and one-way quantum computation. Here, we study quantum steering between two magnon modes in a cavity-magnonics system by applying a two-photon drive field to the microwave cavity. The two magnon modes are entangled and the one-way steering can be implemented when the four-wave mixing is triggered. Different from most schemes that use the
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Non-ambiguous and simplified quantum teleportation protocol EPJ Quantum Technol. (IF 5.3) Pub Date : 2023-05-11 Mario Mastriani
In this study, a new version of the quantum teleportation protocol is presented, which does not require a Bell state measurement (BSM) module on the sender side (Alice), a unitary transform to reconstruct the teleported state on the receiver side (Bob), neither a disambiguation process through two classic bits that travel through a classic disambiguation channel located between sender and receiver