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  • Benchmarking near-term devices with quantum error correction
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-08-02
    James R Wootton

    Now that ever more sophisticated devices for quantum computing are being developed, we require ever more sophisticated benchmarks. This includes a need to determine how well these devices support the techniques required for quantum error correction. In this paper we introduce the topological_codes module of Qiskit-Ignis, which is designed to provide the tools necessary to perform such tests. Specifically

    更新日期:2020-08-03
  • Constant depth fault-tolerant Clifford circuits for multi-qubit large block codes
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-07-29
    Yi-Cong Zheng, Ching-Yi Lai, Todd A Brun and Leong-Chuan Kwek

    Fault-tolerant quantum computation (FTQC) schemes using large block codes that encode k > 1 qubits in n physical qubits can potentially reduce the resource overhead to a great extent because of their high encoding rate. However, the fault-tolerant (FT) logical operations for the encoded qubits are difficult to find and implement, which usually takes not only a very large resource overhead but also

    更新日期:2020-07-30
  • Experimental control of the degree of non-classicality via quantum coherence
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-07-22
    A Smirne, T Nitsche, D Egloff, S Barkhofen, S De, I Dhand, C Silberhorn, S F Huelga and M B Plenio

    The origin of non-classicality in physical systems and its connection to distinctly quantum features such as entanglement and coherence is a central question in quantum physics. This work analyses this question theoretically and experimentally, linking quantitatively non-classicality with quantum coherence. On the theoretical front, we show when the coherence of an observable is linearly related to

    更新日期:2020-07-23
  • Finding semi-optimal measurements for entanglement detection using autoencoder neural networks
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-07-20
    Mohammad Yosefpor, Mohammad Reza Mostaan and Sadegh Raeisi

    Entanglement is one of the key resources of quantum information science which makes identification of entangled states essential to a wide range of quantum technologies and phenomena. This problem is however both computationally and experimentally challenging. Here we use autoencoder neural networks to find semi-optimal set of incomplete measurements that are most informative for the detection of entangled

    更新日期:2020-07-21
  • A quantum deep convolutional neural network for image recognition
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-07-19
    YaoChong Li, Ri-Gui Zhou, RuQing Xu, Jia Luo and WenWen Hu

    Deep learning achieves unprecedented success involves many fields, whereas the high requirement of memory and time efficiency tolerance have been the intractable challenges for a long time. On the other hand, quantum computing shows its superiorities in some computation problems owing to its intrinsic properties of superposition and entanglement, which may provide a new path to settle these issues

    更新日期:2020-07-20
  • OAM tomography with Heisenberg–Weyl observables
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-07-13
    Alexandra Maria Pălici, Tudor-Alexandru Isdrailă, Stefan Ataman and Radu Ionicioiu

    Photons carrying orbital angular momentum (OAM) are excellent qudits and are widely used in several applications, such as long distance quantum communication, d -dimensional teleportation and high-resolution imaging and metrology. All these protocols rely on quantum tomography to characterise the OAM state, which currently requires complex measurements involving spatial light modulators and mode filters

    更新日期:2020-07-14
  • Validating multi-photon quantum interference with finite data
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-07-13
    Fulvio Flamini, Mattia Walschaers, Nicolò Spagnolo, Nathan Wiebe, Andreas Buchleitner and Fabio Sciarrino

    Multi-particle interference is a key resource for quantum information processing, as exemplified by Boson Sampling. Hence, given its fragile nature, an essential desideratum is a solid and reliable framework for its validation. However, while several protocols have been introduced to this end, the approach is still fragmented and fails to build a big picture for future developments. In this work, we

    更新日期:2020-07-14
  • Corrigendum: Long-lived state in a four-spin system hyperpolarized at room temperature
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-07-08
    Koichiro Miyanishi, Naoki Ichijo, Makoto Motoyama, Akinori Kagawa, Makoto Negoro and Masahiro Kitagawa

    Description unavailable

    更新日期:2020-07-09
  • Probing quantum processor performance with pyGSTi
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-07-08
    Erik Nielsen, Kenneth Rudinger, Timothy Proctor, Antonio Russo, Kevin Young and Robin Blume-Kohout

    PyGSTi is a Python software package for assessing and characterizing the performance of quantum computing processors. It can be used as a standalone application, or as a library, to perform a wide variety of quantum characterization, verification, and validation (QCVV) protocols on as-built quantum processors. We outline pyGSTi’s structure, and what it can do, using multiple examples. We cover its

    更新日期:2020-07-09
  • Towards scalable bosonic quantum error correction
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-07-08
    B M Terhal, J Conrad and C Vuillot

    We review some of the recent efforts in devising and engineering bosonic qubits for superconducting devices, with emphasis on the Gottesman–Kitaev–Preskill (GKP) qubit. We present some new results on decoding repeated GKP error correction using finitely-squeezed GKP ancilla qubits, exhibiting differences with previously studied stochastic error models. We discuss circuit-QED ways to realize CZ gates

    更新日期:2020-07-09
  • An open-source, industrial-strength optimizing compiler for quantum programs
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-07-06
    R S Smith, E C Peterson, M G Skilbeck and E J Davis

    Quilc is an open-source, optimizing compiler for gate-based quantum programs written in Quil or QASM, two popular quantum programming languages. The compiler was designed with attention toward NISQ-era quantum computers, specifically recognizing that each quantum gate has a non-negligible and often irrecoverable cost toward a program’s successful execution. Quilc ’s primary goal is to make authoring

    更新日期:2020-07-07
  • Phase-tunable quantum router
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-29
    Guo-An Yan, Wen-Qing Cheng and Hua Lu

    We propose and analyze an efficient scheme for realizing the high transfer rate for quantum router composed of two coupled-resonator waveguides (CRWs) channels coupled with N sequential cavities with embedded N four-level atoms. In this paper, we focus on the effect of the phase difference between different coupling constants which has been ignored in the previous works. In this scheme, we demonstrate

    更新日期:2020-06-30
  • Noisy distributed sensing in the Bayesian regime
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-29
    S Wölk, P Sekatski and W Dür

    We consider non-local sensing of scalar signals with specific spatial dependence in the Bayesian regime. We design schemes that allow one to achieve optimal scaling and are immune to noise sources with a different spatial dependence than the signal. This is achieved by using a sensor array of spatially separated sensors and constructing a multi-dimensional decoherence free subspace. While in the Fisher

    更新日期:2020-06-30
  • Generating microwave photon Fock states in a circuit QED via invariant-based shortcuts to adiabaticity
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-29
    Run-Ying Yan and Zhi-Bo Feng

    Optimal generation of photon Fock states is of significance to quantum science and technology. Here we develop a theoretical scheme for fast generating microwave photon Fock states in a circuit quantum electrodynamics (QED) via invariant-based shortcuts to adiabaticity. A superconducting transmon qubit is dispersively coupled to a cavity field of transmission line resonator. Two classical drivings

    更新日期:2020-06-30
  • staq —A full-stack quantum processing toolkit
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-25
    Matthew Amy and Vlad Gheorghiu

    We describe staq , a full-stack quantum processing toolkit written in standard C++. staq is a quantum compiler toolkit, comprising of tools that range from quantum optimizers and translators to physical mappers for quantum devices with restricted connectives. The design of staq is inspired from the UNIX philosophy of ‘less is more’, i.e. staq achieves complex functionality via combining (piping) small

    更新日期:2020-06-26
  • Corrigendum: Randomized benchmarking in the analogue setting (2020 Quantum Sci. Technol. 5 034001 [http://doi.org/10.1088/2058-9565/ab7eec] )
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-23
    E Derbyshire, J Yago Malo, A J Daley, E Kashefi and P Wallden

    Description unavailable

    更新日期:2020-06-24
  • Thermodynamics of a quantum annealer
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-17
    Lorenzo Buffoni and Michele Campisi

    The D-wave processor is a partially controllable open quantum system that exchanges energy with its surrounding environment (in the form of heat) and with the external time dependent control fields (in the form of work). Despite being rarely thought as such, it is a thermodynamic machine. Here we investigate the properties of the D-Wave quantum annealers from a thermodynamical perspective. We performed

    更新日期:2020-06-18
  • Minimum hardware requirements for hybrid quantum–classical DMFT
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-17
    B Jaderberg, A Agarwal, K Leonhardt, M Kiffner and D Jaksch

    We numerically emulate noisy intermediate-scale quantum (NISQ) devices and determine the minimal hardware requirements for two-site hybrid quantum–classical dynamical mean-field theory (DMFT). We develop a circuit recompilation algorithm which significantly reduces the number of quantum gates of the DMFT algorithm and find that the quantum–classical algorithm converges if the two-qubit gate fidelities

    更新日期:2020-06-18
  • Entanglement of truncated quantum states
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-17
    Giacomo Sorelli, Vyacheslav N Shatokhin, Filippus S Roux and Andreas Buchleitner

    We investigate the impact of Hilbert-space truncation upon the entanglement of an initially maximally entangled m × m bipartite quantum state, after propagation under an entanglement-preserving n × n ( n ⩾ m ) unitary. Truncation—physically enforced, e.g., by a detector’s finite cross section—projects the state onto an s × s -dimensional subspace (3 ⩽ s ⩽ n ). For a random local unitary evolution,

    更新日期:2020-06-18
  • OpenFermion: the electronic structure package for quantum computers
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-14
    JarrodR McClean, Nicholas C Rubin, Kevin J Sung, Ian D Kivlichan, Xavier Bonet-Monroig, Yudong Cao, Chengyu Dai, E Schuyler Fried, Craig Gidney, Brendan Gimby, Pranav Gokhale, Thomas Häner, Tarini Hardikar, Vojtěch Havlíček, Oscar Higgott, Cupjin Huang, Josh Izaac, Zhang Jiang, Xinle Liu, Sam McArdle, Matthew Neeley, Thomas O’Brien, Bryan O’Gorman, Isil Ozfidan, Maxwell D Radin, Jhonathan Romero, Nicolas

    Quantum simulation of chemistry and materials is predicted to be an important application for both near-term and fault-tolerant quantum devices. However, at present, developing and studying algorithms for these problems can be difficult due to the prohibitive amount of domain knowledge required in both the area of chemistry and quantum algorithms. To help bridge this gap and open the field to more

    更新日期:2020-06-14
  • Rigorous measurement error correction
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-08
    Michael R Geller

    We review an experimental technique used to correct state preparation and measurement errors on gate-based quantum computers, and discuss its rigorous justification. Within a specific biased quantum measurement model, we prove that nonideal measurement of an arbitrary n -qubit state is equivalent to ideal projective measurement followed by a classical Markov process Γ acting on the output probability

    更新日期:2020-06-08
  • Quantum computation of an interacting fermionic model
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-07
    Chinmay Mishra, Shane Thompson, Raphael Pooser and George Siopsis

    Relativistic fermionic field theories constitute the fundamental description of all observable matter. The simplest of the models provide a useful, classically verifiable benchmark for noisy intermediate scale quantum computers. We calculate the energy levels of a model of Dirac fermions with four-fermion interactions, on a lattice in 1 + 1 space-time dimensions. We employ a hybrid classical-quantum

    更新日期:2020-06-07
  • Two-body quantum absorption refrigerators with optomechanical-like interactions
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-03
    M Tahir Naseem, Avijit Misra and Özgür E Müstecaplıoğlu

    Quantum absorption refrigerator (QAR) autonomously extracts heat from a cold bath and dumps into a hot bath by exploiting the input heat from a higher temperature reservoir. QARs typically require three-body interactions. We propose and examine a two-body QAR model based upon optomechanical-like coupling in the working medium composed of either two two-level systems or two harmonic oscillators or one

    更新日期:2020-06-03
  • Inhomogeneous driving in quantum annealers can result in orders-of-magnitude improvements in performance
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-03
    Juan I Adame and Peter L McMahon

    Quantum annealers are special-purpose quantum computers that primarily target solving Ising optimization problems. Theoretical work has predicted that the probability of a quantum annealer ending in a ground state can be dramatically improved if the spin driving terms, which play a crucial role in the functioning of a quantum annealer, have different strengths for different spins; that is, they are

    更新日期:2020-06-03
  • Efficient microwave frequency conversion mediated by a photonics compatible silicon nitride nanobeam oscillator
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-06-01
    J M Fink, M Kalaee, R Norte, A Pitanti and O Painter

    Microelectromechanical systems and integrated photonics provide the basis for many reliable and compact circuit elements in modern communication systems. Electro-opto-mechanical devices are currently one of the leading approaches to realize ultra-sensitive, low-loss transducers for an emerging quantum information technology. Here we present an on-chip microwave frequency converter based on a planar

    更新日期:2020-06-01
  • Lower bounds on the non-Clifford resources for quantum computations
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-31
    Michael Beverland, Earl Campbell, Mark Howard and Vadym Kliuchnikov

    Treating stabilizer operations as free, we establish lower bounds on the number of resource states, also known as magic states, needed to perform various quantum computing tasks. Our bounds apply to adaptive computations using measurements with an arbitrary number of stabilizer ancillas. We consider (1) resource state conversion, (2) single-qubit unitary synthesis, and (3) computational subroutines

    更新日期:2020-05-31
  • Certification of a functionality in a quantum network stage
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-31
    Victoria Lipinska, Lê Phuc Thinh, Jérémy Ribeiro and Stephanie Wehner

    We consider testing the ability of quantum network nodes to execute multi-round quantum protocols. Specifically, we examine protocols in which the nodes are capable of performing quantum gates, storing qubits and exchanging said qubits over the network a certain number of times. We propose a simple ping-pong test, which provides a certificate for the capability of the nodes to run certain multi-round

    更新日期:2020-05-31
  • Witnessing entanglement in experiments with correlated noise
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-31
    Bas Dirkse, Matteo Pompili, Ronald Hanson, Michael Walter and Stephanie Wehner

    The purpose of an entanglement witness experiment is to certify the creation of an entangled state from a finite number of trials. The statistical confidence of such an experiment is typically expressed as the number of observed standard deviations of witness violations. This method implicitly assumes that the noise is well-behaved so that the central limit theorem applies. In this work, we propose

    更新日期:2020-05-31
  • An updated LLVM-based quantum research compiler with further OpenQASM support
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-27
    Andrew Litteken, Yung-Ching Fan, Devina Singh, Margaret Martonosi and Frederic T Chong

    Quantum computing is a rapidly growing field with the potential to change how we solve previously intractable problems. Emerging hardware is approaching a complexity that requires increasingly sophisticated programming and control. Scaffold is an older quantum programming language that was originally designed for resource estimation for far-future, large quantum machines, and ScaffCC is the corresponding

    更新日期:2020-05-27
  • QuESTlink—Mathematica embiggened by a hardware-optimised quantum emulator
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-27
    Tyson Jones and Simon Benjamin

    We introduce QuESTlink,pronounced ‘quest link’, an open-source Mathematicapackage which efficiently emulates quantum computers. By integratingwith the Quantum Exact Simulation Toolkit (QuEST), QuESTlink offers ahigh-level, expressive and usable interface to a high-performance, hardware-accelerated emulator. Requiring no installation, QuESTlink streamlines the powerful analysis capabilities of Mathematica

    更新日期:2020-05-27
  • Quantum scrambling and the growth of mutual information
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-25
    Akram Touil and Sebastian Deffner

    Quantum information scrambling refers to the loss of local recoverability of quantum information, which has found widespread attention from high energy physics to quantum computing. In the present analysis we propose a possible starting point for the development of a comprehensive framework for the thermodynamics of scrambling. To this end, we prove that the growth of entanglement as quantified by

    更新日期:2020-05-25
  • Applications of near-term photonic quantum computers: software and algorithms
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-20
    Thomas R Bromley, Juan Miguel Arrazola, Soran Jahangiri, Josh Izaac, Nicolás Quesada, Alain Delgado Gran, Maria Schuld, Jeremy Swinarton, Zeid Zabaneh and Nathan Killoran

    Gaussian boson sampling (GBS) is a near-term platform for photonic quantum computing. Recent efforts have led to the discovery of GBS algorithms with applications to graph-based problems, point processes, and molecular vibronic spectra in chemistry. The development of dedicated quantum software is a key enabler in permitting users to program devices and implement algorithms. In this work, we introduce

    更新日期:2020-05-20
  • Figures of merit for quantum transducers
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-18
    Emil Zeuthen, Albert Schliesser, Anders S Sørensen and Jacob M Taylor

    Recent technical advances have sparked renewed interest in physical systems that couple simultaneously to different parts of the electromagnetic spectrum, thus enabling transduction of signals between vastly different frequencies at the level of single quanta. Such hybrid systems have demonstrated frequency conversion of classical signals and have the potential of enabling quantum state transfer, e

    更新日期:2020-05-18
  • Training the quantum approximate optimization algorithm without access to a quantum processing unit
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-11
    Michael Streif and Martin Leib

    In this paper, we eliminate the classical outer learning loop of the quantum approximate optimization algorithm (QAOA) and present a strategy to find good parameters for QAOA based on topological arguments of the problem graph and tensor network techniques. Starting from the observation of the concentration of control parameters of QAOA, we find a way to classically infer parameters which scales polynomially

    更新日期:2020-05-11
  • A quantum algorithm to efficiently sample from interfering binary trees
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-10
    Davide Provasoli, Benjamin Nachman, Christian Bauer and Wibe A de Jong

    Quantum computers provide an opportunity to efficiently sample from probability distributions that include non-trivial interference effects between amplitudes. Using a simple process wherein all possible state histories can be specified by a binary tree, we construct an explicit quantum algorithm for an important three-dimensional subspace of the parameter space that runs in polynomial time to sample

    更新日期:2020-05-10
  • Quantum electronics and optics at the interface of solid neon and superfluid helium
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-10
    Dafei Jin

    We predict a new quantum electronic structure at the interface between two condensed phases of noble-gas elements: solid neon and superfluid helium. An excess electron injected onto this interface self-confines its wavefunction into a nanometric dome structure. Its size varies with pressure and optical transitions cover a broad mid-infrared spectrum. A collection of such electrons can form a classical

    更新日期:2020-05-10
  • Intel Quantum Simulator: a cloud-ready high-performance simulator of quantum circuits
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-10
    Gian Giacomo Guerreschi, Justin Hogaboam, Fabio Baruffa and Nicolas P D Sawaya

    Classical simulation of quantum computers will continue to play an essential role in the progress of quantum information science, both for numerical studies of quantum algorithms and for modeling noise and errors. Here we introduce the latest release of Intel Quantum Simulator (IQS), formerly known as qHiPSTER. The high-performance computing (HPC) capability of the software allows users to leverage

    更新日期:2020-05-10
  • Engineering electro-optics in SiGe/Si waveguides for quantum transduction
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-06
    Jason Orcutt, Hanhee Paik, Lev Bishop, Chi Xiong, Ryan Schilling and Abram Falk

    High efficiency microwave-optical transduction for quantum-state transfer remains an outstanding technical challenge. Resonant electro-optic transduction via three-wave mixing is an attractive solution, with a simple operating principle that does not rely on intermediate quantum states. However, the intrinsic optical and microwave losses of electro-optic materials with large Pockels coefficients have

    更新日期:2020-05-06
  • Resonant exchange operation in triple-quantum-dot qubits for spin–photon transduction
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-05-06
    Andrew Pan, Tyler E Keating, Mark F Gyure, Emily J Pritchett, Samuel Quinn, Richard S Ross, Thaddeus D Ladd and Joseph Kerckhoff

    Triple quantum dots (TQDs) are promising semiconductor spin qubits because of their all-electrical control via fast, tunable exchange interactions and immunity to global magnetic fluctuations. These qubits can experience strong transverse interaction with photons in the resonant exchange (RX) regime, when exchange is simultaneously active on both qubit axes. However, most theoretical work has been

    更新日期:2020-05-06
  • Randomized benchmarking in the analogue setting
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-04-29
    E Derbyshire, J Yago Malo, A J Daley, E Kashefi and P Wallden

    Current development in programmable analogue quantum simulators (AQS), whose physical implementation can be realised in the near-term compared to those of large-scale digital quantum computers, highlights the need for robust testing techniques in analogue platforms. Methods to properly certify or benchmark AQS should be efficiently scalable, and also provide a way to deal with errors from state preparation

    更新日期:2020-04-29
  • A silicon‐organic hybrid platform for quantum microwave-to-optical transduction
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-04-29
    Jeremy D Witmer, Timothy P McKenna, Patricio Arrangoiz-Arriola, Raphaël Van Laer, E Alex Wollack, Francis Lin, Alex K-Y Jen, Jingdong Luo and Amir H Safavi-Naeini

    Low-loss fiber optic links have the potential to connect superconducting quantum processors together over long distances to form large scale quantum networks. A key component of these future networks is a quantum transducer that coherently and bidirectionally converts photons from microwave frequencies to optical frequencies. We present a platform for electro-optic photon conversion based on silicon‐organic

    更新日期:2020-04-29
  • Inter-qubit interaction mediated by collective modes in a linear array of three-dimensional cavities
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-04-27
    Dmytro Dubyna and Watson Kuo

    A design of LEGO-like construction set that allows assembling of different linear arrays of three-dimensional (3D) cavities and qubits for circuit quantum electrodynamics experiments has been developed. A study of electromagnetic properties of qubit-3D cavity arrays has been done by using high frequency structure simulator (HFSS). A technique for estimation of inter-qubit coupling strength between

    更新日期:2020-04-27
  • Quantum-classical simulation of two-site dynamical mean-field theory on noisy quantum hardware
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-04-27
    Trevor Keen, Thomas Maier, Steven Johnston and Pavel Lougovski

    We report on a quantum–classical simulation of the single-band Hubbard model using two-site dynamical mean-field theory (DMFT). Our approach uses IBM’s superconducting qubit chip to compute the zero-temperature impurity Green’s function in the time domain and a classical computer to fit the measured Green’s functions and extract their frequency domain parameters. We find that the quantum circuit synthesis

    更新日期:2020-04-27
  • Logical performance of 9 qubit compass codes in ion traps with crosstalk errors
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-04-27
    Dripto M Debroy, Muyuan Li, Shilin Huang and Kenneth R Brown

    We simulate four quantum error correcting codes under error models inspired by realistic noise sources in near-term ion trap quantum computers: T 2 dephasing, gate overrotation, and crosstalk. We use this data to find preferred codes for given error parameters along with logical error biases and a pseudothreshold which compares the physical and logical gate failure rates for a CNOT gate. Using these

    更新日期:2020-04-27
  • Establishing the quantum supremacy frontier with a 281 Pflop/s simulation
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-04-27
    Benjamin Villalonga, Dmitry Lyakh, Sergio Boixo, Hartmut Neven, Travis S Humble, Rupak Biswas, Eleanor G Rieffel, Alan Ho and Salvatore Mandrà

    Noisy intermediate-scale quantum (NISQ) computers are entering an era in which they can perform computational tasks beyond the capabilities of the most powerful classical computers, thereby achieving ‘quantum supremacy’, a major milestone in quantum computing. NISQ supremacy requires comparison with a state-of-the-art classical simulator. We report HPC simulations of hard random quantum circuits (RQC)

    更新日期:2020-04-27
  • A quantum-classical cloud platform optimized for variational hybrid algorithms
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-04-20
    Peter J Karalekas, Nikolas A Tezak, Eric C Peterson, Colm A Ryan, Marcus P da Silva and Robert S Smith

    In order to support near-term applications of quantum computing, a new compute paradigm has emerged—the quantum-classical cloud—in which quantum computers (QPUs) work in tandem with classical computers (CPUs) via a shared cloud infrastructure. In this work, we enumerate the architectural requirements of a quantum-classical cloud platform, and present a framework for benchmarking its runtime performance

    更新日期:2020-04-22
  • MCTDH-X : The multiconfigurational time-dependent Hartree method for indistinguishable particles software
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-04-20
    Rui Lin, Paolo Molignini, Luca Papariello, Marios C Tsatsos, Camille Lévêque, Storm E Weiner, Elke Fasshauer, R Chitra and Axel U J Lode

    We introduce and describe the multiconfigurational time-depenent Hartree for indistinguishable particles (MCTDH-X) software, which is hosted, documented, and distributedat http://ultracold.org [http://ultracold.org] . This powerful tool allows the investigation of ground state properties and dynamics of interacting quantum many-body systems in different spatial dimensions. The MCTDH-X software is a

    更新日期:2020-04-22
  • Quantum circuit optimizations for NISQ architectures
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-03-30
    Beatrice Nash, Vlad Gheorghiu and Michele Mosca

    Currently available quantum computing hardware platforms have limited 2-qubit connectivity among their addressable qubits. In order to run a generic quantum algorithm on such a platform, one has to transform the initial logical quantum circuit describing the algorithm into an equivalent one that obeys the connectivity restrictions. In this work we construct a circuit synthesis scheme that takes as

    更新日期:2020-04-22
  • Impact of qubit connectivity on quantum algorithm performance
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-03-30
    Adam Holmes, Sonika Johri, Gian Giacomo Guerreschi, James S Clarke and A Y Matsuura

    Quantum computing hardware is undergoing rapid development from proof-of-principle devices to scalable machines that could eventually challenge classical supercomputers on specific tasks. On platforms with local connectivity, the transition from one- to two-dimensional arrays of qubits is seen as a natural technological step to increase the density of computing power and to reduce the routing cost

    更新日期:2020-04-22
  • Anomalous values, Fisher information, and contextuality, in generalized quantum measurements
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-03-17
    Valeria Cimini, Ilaria Gianani, Fabrizio Piacentini, Ivo Pietro Degiovanni and Marco Barbieri

    Postselection following weak measurements has long been investigated for its peculiar manifestation of quantum signatures. In particular, the postselected events can give rise to anomalous values lying outside the spectrum of the measured quantity, and may provide enhanced Fisher information. Furthermore, the Pusey inequality highlights that, for extremely weak measurements, non-contextual models cannot

    更新日期:2020-04-22
  • Long-lived state in a four-spin system hyperpolarized at room temperature
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-03-17
    Koichiro Miyanishi, Naoki Ichijo, Makoto Motoyama, Akinori Kagawa, Makoto Negoro and Masahiro Kitagawa

    A solution with hyperpolarized nuclear spins encoded into a long-lived state has been utilized for sensing chemical phenomena. In a conventional way, nuclear spins are hyperpolarized at very low temperatures. In this work, we demonstrate the encoding of a four-nuclear-spin system hyperpolarized at room temperature into a long-lived state in a solution. We apply the solution with the long-lived state

    更新日期:2020-04-22
  • Saturating the quantum Cramér–Rao bound using LOCC
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-03-17
    Sisi Zhou, Chang-Ling Zou and Liang Jiang

    The quantum Cramér–Rao bound (QCRB) provides an ultimate precision limit allowed by quantum mechanics in parameter estimation. Given any quantum state dependent on a single parameter, there is always a positive-operator valued measurement (POVM) saturating the QCRB. However, the QCRB-saturating POVM cannot always be implemented efficiently, especially in multipartite systems. In this paper, we show

    更新日期:2020-04-22
  • Levitated cavity optomechanics in high vacuum
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-03-17
    Uroš Delić, David Grass, Manuel Reisenbauer, Tobias Damm, Martin Weitz, Nikolai Kiesel and Markus Aspelmeyer

    We report dispersive coupling of an optically trapped nanoparticle to the field of a Fabry–Perot cavity in high vacuum. We demonstrate nanometer-level control in positioning the particle with respect to the cavity field, which allows access to linear, quadratic, and tertiary optomechanical interactions in the resolved sideband regime. We determine all relevant coupling rates of the system, i.e. mechanical

    更新日期:2020-04-22
  • Perspectives on quantum transduction
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-03-17
    Nikolai Lauk, Neil Sinclair, Shabir Barzanjeh, Jacob P Covey, Mark Saffman, Maria Spiropulu and Christoph Simon

    Quantum transduction, the process of converting quantum signals from one form of energy to another, is an important area of quantum science and technology. The present perspective article reviews quantum transduction between microwave and optical photons, an area that has recently seen a lot of activity and progress because of its relevance for connecting superconducting quantum processors over long

    更新日期:2020-04-22
  • Multimode Fock states with large photon number: effective descriptions and applications in quantum metrology
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-02-18
    M Perarnau-Llobet, A González-Tudela and J I Cirac

    We develop general tools to characterise and efficiently compute relevant observables of multimode N -photon states generated in nonlinear decays in one-dimensional waveguides. We then consider optical interferometry in a Mach–Zender interferometer where a d -mode photonic state enters in each arm of the interferometer. We derive a simple expression for the quantum Fisher information in terms of the

    更新日期:2020-04-22
  • XACC: a system-level software infrastructure for heterogeneous quantum–classical computing
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-02-04
    Alexander J McCaskey, Dmitry I Lyakh, Eugene F Dumitrescu, Sarah S Powers and Travis S Humble

    Quantum programming techniques and software have advanced significantly over the past five years, with a majority focusing on high-level language frameworks targeting remote REST library APIs. As quantum computing architectures advance and become more widely available, lower-level, system software infrastructures will be needed to enable tighter, co-processor programming and access models. Here we

    更新日期:2020-03-30
  • Generation of hybrid maximally entangled states in a one-dimensional quantum walk
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-02-04
    Aikaterini Gratsea, Maciej Lewenstein and Alexandre Dauphin

    We study the generation of hybrid entanglement in a one-dimensional quantum walk. In particular, we explore the preparation of maximally entangled states between position and spin degrees of freedom. We address it as an optimization problem, where the cost function is the Schmidt norm. We then benchmark the algorithm and compare the generation of entanglement between the Hadamard quantum walk, the

    更新日期:2020-03-30
  • Machine learning design of a trapped-ion quantum spin simulator
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-01-16
    Yi Hong Teoh, Marina Drygala, Roger G Melko and Rajibul Islam

    Trapped ions have emerged as one of the highest quality platforms for the quantum simulation of interacting spin models of interest to various fields of physics. In such simulators, two effective spins can be made to interact with arbitrary strengths by coupling to the collective vibrational or phonon states of ions, controlled by precisely tuned laser beams. However, the task of determining laser

    更新日期:2020-03-30
  • Modeling and control of a reconfigurable photonic circuit using deep learning
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2020-01-16
    Akram Youssry, Robert J Chapman, Alberto Peruzzo, Christopher Ferrie and Marco Tomamichel

    The complexity of experimental quantum information processing devices is increasing rapidly, requiring new approaches to control them. In this paper, we address the problems of practically modeling and controlling an integrated optical waveguide array chip—a technology expected to have many applications in telecommunications and optical quantum information processing. This photonic circuit can be electrically

    更新日期:2020-03-30
  • High coherence plane breaking packaging for superconducting qubits.
    Quantum Sci. Technol. (IF 4.041) Pub Date : 2018-05-05
    Nicholas T Bronn,Vivekananda P Adiga,Salvatore B Olivadese,Xian Wu,Jerry M Chow,David P Pappas

    We demonstrate a pogo pin package for a superconducting quantum processor specifically designed with a nontrivial layout topology (e.g., a center qubit that cannot be accessed from the sides of the chip). Two experiments on two nominally identical superconducting quantum processors in pogo packages, which use commercially available parts and require modest machining tolerances, are performed at low

    更新日期:2019-11-01
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