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On the classical complexity of sampling from quantum interference of indistinguishable bosons Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201125
V. S. ShchesnovichExperimental demonstration of the quantum advantage over classical simulations with Boson Sampling is currently under intensive investigation. There seems to be a scalability issue to the necessary number of bosons on the linear optical platforms and the experiments, such as the recent Boson Sampling with 20 photons on 60port interferometer by H. Wang et al., Phys. Rev. Lett.123 (2019) 250503, are

Introduction, generation and entanglement of entangled displaced even and odd squeezed states Int. J. Quantum Inf. (IF 1.176) Pub Date : 20210118
Amir KarimiIn this paper, first, we introduce special types of entangled quantum states named “entangled displaced even and odd squeezed states” by using displaced even and odd squeezed states which are constructed via the action of displacement operator on the even and odd squeezed states, respectively. Next, we present a theoretical scheme to generate the introduced entangled states. This scheme is based on

Steadystate quantum correlation measurement in hybrid optomechanical systems Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201229
Tesfay Gebremariam Tesfahannes; Merkebu Dereje GetahuneIn this paper, we investigate the steadystate of quantum correlation measurement of hybrid optomechanical systems. The first system consists of a single optomechanical system simultaneously coupled to a mechanical oscillator. While the second system is a hybrid optomechanical system consisting of an atomic ensemble placed in between the optical cavity and mirror. For both optomechanical systems, we

Highdimensional quantum state manipulation and tracking Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201221
Mevludin LicinaDynamical highdimensional quantum states can be tracked and manipulated in many cases. Using a new theoretical framework approach of manipulating quantum systems, we will show how one can manipulate and introduce parameters that allow tracking and descriptive insight in the dynamics of states. Using quantum topology and other novel mathematical representations, we will show how quantum states behave

Distinguishing environmentinduced nonMarkovianity from subsystem dynamics Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201123
Subhashish Banerjee; Javid Naikoo; R. SrikanthQuantum nonMarkovianity modifies the environmental decoherence of a system. This situation is enriched in complex systems owing to interactions among subsystems. We consider the problem of distinguishing the multiple sources of nonMarkovianity using a simple power spectrum technique, applied to a qubit interacting with another qubit via a Jaynes–Cummingstype Hamiltonian and simultaneously subjected

The chaotic dynamics of a quantum Cournot duopoly game with bounded rationality Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200916
Xinli Zhang; Deshan Sun; Wei JiangThis paper analyzes the chaotic dynamics of a quantum Cournot duopoly game with bounded rational players by applying quantum game theory. We investigate the impact of quantum entanglement on the stability of the quantum Nash equilibrium points and chaotic dynamics behaviors of the system. The result shows that the stability region decreases with the quantum entanglement increasing. The adjustment speeds

Effects of entanglement on vortex dynamics in the hydrodynamic representation of quantum mechanics Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201001
Satoya ImaiThe hydrodynamic representation of quantum mechanics describes virtual flow as if a quantum system were fluid in motion. This formulation illustrates pointlike vortices when the phase of a wavefunction becomes nonintegrable at nodal points. We study the dynamics of such pointlike vortices in the hydrodynamic representation for a twoparticle wavefunction. In particular, we discuss how quantum entanglement

Highdimensional quantum key distribution using polarizationphase encoding: security analysis Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201023
Ali MehriToonabi; Mahdi Davoudi Darareh; Shahrooz JanbazIn this work, we introduce a highdimensional polarizationphase (PoP)based quantum key distribution protocol, briefly named PoP(d,M), where d is the dimension of a hybrid quantum state including polarization and phase degrees of freedom of the same photon, and M is the number of mutually unbiased bases. We present a detailed description of the PoP(4,2) protocol as a special case, and evaluate its

Design of quantum dot cellular automata based fault tolerant convolution encoders for secure nanocomputing Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200922
Suhaib Ahmed; Syed Farah NazThe issues faced by Complementary metal oxide semiconductor (CMOS) technology in the nanoregime have led to the research of other possible technologies which can operate with same functionalities however, with higher speed and lower power dissipation. One such technology is Quantumdot Cellular Automata (QCA). At present, logic circuit designs using QCA have been comprehensively researched and one

Analysis of achievable distances of BB84 and KMB09 QKD protocols Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200929
Muhammad Mubashir Khan; Asad Arfeen; Usama Ahsan; Saneeha Ahmed; Tahreem MumtazQuantum key distribution (QKD) is a proven secured way to transmit shared secret keys using quantum particles. Any adversarial attempt to intercept and eavesdrop secret key results in generating errors alerting the legitimate users. Since QKD is constrained by quantum mechanics principles, the practical transmission of the key at a greater distance is an issue. In this paper, we discover and analyze

Quantum simulation dynamics and circuit synthesis of FMO complex on an NMR quantum computer Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201005
M. Mahdian; H. Davoodi Yeganeh; A. DehghaniRecently, the dynamics simulation of lightharvesting complexes as an open quantum system, in the weak and strong coupling regimes, has received much attention. In this paper, we investigate a digital quantum simulation approach of the Fenna–Matthews–Olson (FMO) photosynthetic pigmentprotein complex surrounded with a Markovian bath, i.e. memoryless, based on a nuclear magnetic resonance (NMR) quantum

Quantum arithmetic operations based on quantum fourier transform on signed integers Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201007
Engin ŞahinThe quantum Fourier transform (QFT) brings efficiency in many respects, especially usage of resource, for most operations on quantum computers. In this study, the existing QFTbased and nonQFTbased quantum arithmetic operations are examined. The capabilities of QFTbased addition and multiplication are improved with some modifications. The proposed operations are compared with the nearest quantum

Digital quantum simulation of hadronization in Yang–Mills theory Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201106
DeSheng Li; ChunWang Wu; Ming Zhong; Wei Wu; PingXing ChenA quantum algorithm of SU(N) Yang–Mills theory is formulated in terms of quantum circuits. It can nonperturbatively calculate the Dyson series and scattering amplitudes with polynomial complexity. The gauge fields in the interaction picture are discretized on the same footing with the lattice fermions in momentum space to avoid the fermion doubling and the gauge symmetry breaking problems. Applying

Triggering parametricdown conversionbased quantum key distribution via radiation field Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201021
Tchoffo Martin; Tene Alain Giresse; Djebayole Mimbe III YannickWe discuss the influence of radiation field on the secure key size and the maximum safety distance during QKD by using a set of photons produced via a spontaneous parametricdown conversion (SPDC) photon source. Four implementations that use multiplephotons and decoy states are discussed, these include nondecoy state, infinite active decoy state, passive decoy state with threshold detector and passive

A complex nonlinear approach for understanding quantum physics Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201120
J. R. CrocaTo understand quantum phenomena, namely, the particlewave duality, in a causal relational way, a complex nonlinear process, in which a minor action may, under adequate conditions, give rise to a huge reaction, was proposed by de Broglie. The nonlinear process is mediated by the guiding or pilot wave principle, or as is now named by the principle of eurhythmy. This process rejects the ontic status

Two efficient measurement device independent quantum dialogue protocols Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201113
Nayana Das; Goutam PaulQuantum dialogue is a process of twoway secure and simultaneous communication using a single channel. Recently, a Measurement Device Independent Quantum Dialogue (MDIQD) protocol has been proposed [A. Maitra, Measurement device independent quantum dialogue,Quantum Inf. Process. 16(12) (2017) 305]. To make the protocol secure against information leakage, the authors have discarded almost half of the

Online quantum state tomography of Nqubit via continuous weak measurement and compressed sensing Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201030
Sajede Harraz; Shuang Cong; Kezhi LiIn this paper, we propose an online state tomography method for Nqubit quantum system based on the continuous weak measurement and compressed sensing (CS). The quantum system is described by stochastic master equation. The continuous weak measurement operators for the Nqubit quantum system, which are indirectly acted on the quantum system, are derived according to the measurement operator results

NonMarkovianity leading to coherence revivals in an open quantum system Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201030
Y. Yugra; F. De ZelaCoherence and quantum correlations have been identified as fundamental resources for quantum information tasks. As recently shown, these resources can be interconverted. In multipartite systems, entanglement represents a prominent case among quantum correlations, one which can be activated from coherence. All this makes coherence a key resource for securing the operational advantage of quantum technologies

Cryptanalysis and improvement of Wu–Cai–Wu–Zhang’s quantum private comparison protocol Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201030
Guang Ping HeIn a recent paper [Int. J. Quantum Inf.17 (2019) 1950026], the authors discussed the shortcomings in the security of a quantum private comparison protocol that we previously proposed [Int. J. Quantum Inf.15 (2017) 1750014]. They also proposed a new protocol aimed to avoid these problems. Here, we analyze the information leaked in their protocol, and find that it is even less secure than our protocol

The varieties of minimal tomographically complete measurements Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201027
John B. DeBrota; Christopher A. Fuchs; Blake C. StaceyMinimal Informationally Complete quantum measurements, or MICs, illuminate the structure of quantum theory and how it departs from the classical. Central to this capacity is their role as tomographically complete measurements with the fewest possible number of outcomes for a given finite dimension. Despite their advantages, little is known about them. We establish general properties of MICs, explore

Comment on “Quantum key agreement protocol” Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201027
Nayana Das; Ritajit MajumdarThe first twoparty Quantum Key Agreement (QKA) protocol, based on quantum teleportation, was proposed by Zhou et al. (Electron. Lett. 40(18) (2004) 1149). In this protocol, to obtain the key bit string, one of the parties uses a device to obtain the inner product of two quantum states, one being unknown, and the other one performs Bell measurement. However, in this paper, we show that it is not possible

Experimental demonstration of optimized quantum process tomography on the IBM quantum experience Int. J. Quantum Inf. (IF 1.176) Pub Date : 20201007
Akshay Gaikwad; Krishna Shende; Kavita DoraiWe experimentally performed complete and optimized quantum process tomography of quantum gates implemented on superconducting qubitbased IBM QX2 quantum processor via two constrained convex optimization (CCO) techniques: least squares optimization and compressed sensing optimization. We studied the performance of these methods by comparing the experimental complexity involved and the experimental

A factorization property of positive maps on C*algebras Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200805
B. V. Rajarama Bhat; Hiroyuki OsakaThe purpose of this short paper is to clarify and present a general version of an interesting observation by [Piani and Mora, Phys. Rev. A 75 (2007) 012305], linking complete positivity of linear maps on matrix algebras to decomposability of their ampliations. Let Ai, Ci be unital C*algebras and let αi be positive linear maps from Ai to Ci,i=1,2. We obtain conditions under which any positive map β

Efficient designs of reversible BCD to EX3 Converter with low quantum cost in nanoscale Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200806
Mojtaba Noorallahzadeh; Mohammad MoslehAs an interesting and significant research domain, reversible logic is massively utilized in technologies, including optical computing, cryptography, quantum computing, nanotechnology, and so on. The realization of quantum computing is not possible without the implementation of reversible logic, and reversible designs are presented mainly to minimize the thermal loss because of the data input bits

On the time–energy uncertainty relation of Kieu applied to quantum evolutions of Grover’s search Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200806
Jie Sun; Songfeng LuRecently, Kieu derived a new class of time–energy uncertainty relations, which is not only formal but also suitable for evaluating the speed limit of quantum dynamics. However, when this time–energy uncertainty relation was applied to study the quantum adiabatic Grover’s search, some approximation had been done for reaching the right conclusion. That is, the final state being orthogonal to the initial

Quantum image encryption based on Lorenz hyperchaotic system Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200813
RiGui Zhou; YingBin LiAccording to the higher security of higherdimensional chaotic system, a new scheme of quantum image encryption and decryption based on Lorenz hyperchaotic system is proposed. The encryption process is mainly divided into two parts: the location information scrambling process and the color information replacement process. In the location information scrambling process, the pseudorandom sequence obtained

Equivalence between entanglement of channel and measurement in quantum teleportation Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200813
S. Govind; S. BalakrishnanIn this work, we analyze the concept of quantum bridge using NonMaximally Entangled (NME) states. We propose two schemes for the quantum teleportation of an unknown qubit using an NME channel as a bridge between the sender and the receiver. We show that quantum channels and the measurements are equivalent in achieving the quantum teleportation only when the degree of entanglement is the maximum.

Implementation of a quantum transfer learning approach to image splicing detection Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200824
Angelina Gokhale; Mandaar B. Pande; Dhanya PramodIn this paper, we present an implementation of quantum transfer learning to blind and passive detection of image splicing forgeries. Though deep learning models are becoming increasingly popular for various computer vision use cases, they depend on powerful classical machines and GPUs for dealing with complex problem solving and also to reduce the time taken for computation. The quantum computing research

Arbitration quantum signature protocol based on XOR encryption Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200821
XiaoYi Zheng; Chang KuangQuantum signature is a branch of quantum cryptography that draws on the design ideas of classic digital signatures, and uses the basic principles of quantum mechanics to achieve the integrity, authenticity and nonrepudiation of quantum information. Among them, arbitration quantum signature (AQS) plays a very important role. In this paper, we proposed an AQS protocol based on XOR encryption. Unlike

Entanglement distribution between quantum repeater nodes with an absorptive type memory Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200818
Daisuke Yoshida; Kazuya Niizeki; Shuhei Tamura; Tomoyuki HorikiriQuantum repeaters, which are indispensable for longdistance quantum communication, are necessary for extending the entanglement from short distance to long distance; however, highrate entanglement distribution, even between adjacent repeater nodes, has not been realized. In a recent work by [C. Jones et al., New J. Phys. 18 (2016) 083015], the entanglement distribution rate between adjacent repeater

Theoretical design of quantum memory unit for under water quantum communication using electromagnetically induced transparency protocol in ultracold 87Rb atoms Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200815
Vikas Singh Chauhan; Dixith Manchaiah; Sumit Bhushan; Rohit Kumar; Raghavan K. EaswaranIn this paper, we present a theoretical proposal to realize Quantum Memory (QM) for storage of blue light pulses (420 nm) using Electromagnetically Induced Transparency (EIT). Threelevel lambdatype EIT configuration system is solved in a fully quantum mechanical approach. Storing blue light has the potential application in the field of underwater quantum communication as it experiences less attenuation

Effect of noise on deterministic remote preparation of an arbitrary twoqudit state by using a fourqudit χtype state as the quantum channel Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200813
Li Lv; Ping ZhouWe present a protocol for remote preparation of an arbitrary twoqudit state by using a fourqudit χtype state as the quantum channel via positive operatorvalued measurement. We first propose the protocol for remote preparation of an arbitrary twoqudit state via positive operatorvalued measurement in noiseless environment and then discuss the protocol in noisy environments. Four important quantum

Twodimensional atom localization via a combination of the standingwave and Gaussian fields Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200704
Somia AbdElNabiThe localization of atom is studied in twodimensional (2D) in a fourlevel Vtype atomic system by using the Gaussian field. The atom localization is investigated through the absorption spectrum of the weak probe field inside two orthogonal standingwave fields. We consider three hypotheses for the interaction between the atom and fields (standingwave and Gaussian fields), each hypothesis is considered

Maxindependent set and the quantum alternating operator ansatz Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200716
Zain Hamid SaleemThe maximumindependent set (MIS) problem of graph theory using the quantum alternating operator ansatz is studied. We perform simulations on the Rigetti Forest simulator for the square ring, K2,3, and K3,3 graphs and analyze the dependence of the algorithm on the depth of the circuit and initial states. The probability distribution of observation of the feasible states representing maximumindependent

Cyclic and cyclic controlled quantum teleportation in a highdimension system Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200706
Fan Wu; MingQiang Bai; YuChun Zhang; RenJu Liu; ZhiWen MoIn this paper, two schemes for cyclic quantum teleportation (CQT) and cyclic controlled quantum teleportation (CCQT) in a highdimension system are proposed. In the first scheme, three distant agents, Alice, Bob and Charlie, are not only the senders but also the receivers, and via the sixqutrit entangled state as the quantum channel, Alice can transfer her quantum information to Bob, at the same time

Singlestate semiquantum key distribution protocol and its security proof Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200710
Wei Zhang; Daowen Qiu; Paulo MateusSemiquantum key distribution (SQKD) can share secret keys by using less quantum resource than its fully quantum counterparts, and this likely makes SQKD become more practical and realizable. In this paper, we present a new SQKD protocol by introducing the idea of B92 protocol in fully quantum cryptography into SQKD. In this protocol, the sender Alice just sends one quantum state to the classical Bob

Unambiguous discrimination between linearly dependent symmetric states with multiple copies Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200718
ShiJun Zhang; WenHai ZhangWe investigate the unambiguous discrimination (UD) among three linearly dependent (LD) symmetric states with N copies. The optimal discrimination probability is derived. Our result shows that a set of linearly dependent symmetric states can be perfectly discriminated as the number of copies goes to infinity.

Local quantum Fisher information and oneway quantum deficit in spin1/2 XX Heisenberg chain with threespin interaction Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200630
BiaoLiang Ye; Bo Li; XiaoBin Liang; ShaoMing FeiWe explore quantum phase transitions in the spin1/2 XX chain with threespin interaction in terms of local quantum Fisher information and oneway quantum deficit, together with the demonstration of quantum fluctuations. Analytical results are derived and analyzed in detail.

Cohering and decohering power of Gaussian channels Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200710
Huazhen Yao; Jianwen Zhang; Yangyang WangIn this paper, we generalized the concepts of the cohering power and decohering power to Gaussian channels for continuousvariable systems with respect to coherence measures based on the relative entropy and obtained some basic properties. In addition, the cohering power and decohering power of classical noise channels, thermal noise channels and amplifier channels are calculated.

Fisher and skew information for twoqubit Bell states under decoherence effects Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200725
R. Laghmach; H. El Hadfi; B. Maroufi; M. DaoudWe give the explicit expressions of quantum Fisher information and skew information for a twoqubit Bell states. We investigate their dynamics under the decoherence effects: phasedamping channel, depolarizing channel and amplitudedamping channel. We also discuss the thermal entanglement quantified by Wootters concurrence for these three decoherence channels and we compare its dynamical behavior with

Quasirandom estimations of twoqubit operatormonotonebased separability probabilities Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200710
Paul B. SlaterWe conduct a pair of quasirandom estimations of the separability probabilities with respect to 10 measures on the 15dimensional convex set of twoqubit states, using its Eulerangle parametrization. The measures include the (nonmonotone) Hilbert–Schmidt one, plus nine others based on operator monotone functions. Our results are supportive of previous assertions that the Hilbert–Schmidt and Bures (minimal

Selfconsistent tomography and measurementdevice independent cryptography Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200704
I. D. Moore; S. J. van EnkA recurring problem in quantum mechanics is to estimate either the state of a quantum system or the measurement operator applied to it. If we wish to estimate both, then the difficulty is that the state and the measurement always appear together: to estimate the state, we must use a measurement; to estimate the measurement operator, we must use a state. The data of such quantum estimation experiments

Adiabatic quantum estimation: A numerical study of the Heisenberg XX model with antisymmetric exchange Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200604
L. Fathi Shadehi; H. Rangani Jahromi; M. GhanaatianIn this paper, we address the adiabatic technique for quantum estimation of the azimuthal orientation of a magnetic field. Exactly solving a model consisting of a twoqubit system, where one of which is driven by a static magnetic field while the other is coupled with the magnetic field rotating adiabatically, we obtain the analytical expression of the quantum Fisher information (QFI). We investigate

Quantum enhanced metrology of Hamiltonian parameters beyond the Cramèr–Rao bound Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200520
Luigi Seveso; Matteo G. A. ParisThis is a tutorial aimed at illustrating some recent developments in quantum parameter estimation beyond the Cramèr–Rao bound, as well as their applications in quantum metrology. Our starting point is the observation that there are situations in classical and quantum metrology where the unknown parameter of interest, besides determining the state of the probe, is also influencing the operation of the

A new design of a lowpower reversible Vedic multiplier Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200520
Meysam Rashno; Majid Haghparast; Mohammad MoslehIn recent years, there has been an increasing tendency towards designing circuits based on reversible logic, and has received much attention because of preventing internal power dissipation. In digital computing systems, multiplier circuits are one of the most fundamental and practical circuits used in the development of a wide range of hardware such as arithmetic circuits and Arithmetic Logic Unit

Gaussian kernel in quantum learning Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200522
Arit Kumar Bishwas; Ashish Mani; Vasile PaladeThe Gaussian kernel is a very popular kernel function used in many machine learning algorithms, especially in support vector machines (SVMs). It is more often used than polynomial kernels when learning from nonlinear datasets and is usually employed in formulating the classical SVM for nonlinear problems. Rebentrost et al. discussed an elegant quantum version of a least square support vector machine

Operations with elements of transferred density matrix via unitary transformations on extended receiver Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200528
A. I. ZenchukWe combine the longdistance quantum state transfer and simple operations with the elements of the transferred (nor perfectly) density matrix. These operations are turning some matrix elements to zero, rearranging the matrix elements and preparing their linear combinations with required coefficients. The basic tool performing these operations is the unitary transformation on the extended receiver.

Quantum limit of genuine tripartite correlations by bipartite extremality Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200528
Hiroyuki Ozeki; Satoshi IshizakaThe characterization of the extremal points of the set of quantum correlations has attracted wide interest. In the simplest bipartite Bell scenario, a necessary and sufficient criterion for identifying extremal correlations has recently been conjectured, but extremality of tripartite correlations is not well known. In this study, we analyze tripartite extremal correlations in terms of the conjectured

An asymmetric dynamic multiparty quantum secret sharing against active attacks Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200513
MingMing Wang; XingYu KongWe propose a dynamic quantum secret sharing (DQSS) protocol based on traveling singlequbits where any number of players can join or leave the protocol according to the dealer’s and players’ will. The protocol can resist collusion attacks of dishonest players by using an honesty test based on some unambiguous unitary operations. Specifically, the proposed protocol is secure against active attacks from

Quantum synchronization and correlations of two qutrits in a nonMarkovian bath Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200511
JianSong ZhangWe investigate quantum synchronization and correlations of two qutrits in one nonMarkovian environment using the hierarchy equation method. There is no direct interaction between two qutrits and each qutrit interacts with the same nonMarkovian environment. The influence of the temperature of the bath, correlation time and coupling strength between qutrits and bath on the quantum synchronization and

Dynamics of a nonlinear timedependent two twolevel atoms in a twomode cavity Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200507
S. T. Korashy; T. M. ElShahat; N. Habiballah; H. ElSheikh; M. AbdelAtyIn this paper, we present some properties through two twolevel atoms interacting with a twomode quantized cavity field. We study this system in the presence of detuning parameter, Kerr nonlinearity, Stark shift, relative phase and intensitydependent atomsfield coupling. Also, the coupling parameter is modulated to be time dependent. The exact solution of this model is given by using the Schrődinger

Quantum image sharpness estimation based on the Laplacian operator Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200506
SheXiang Jiang; RiGui Zhou; WenWen HuIn order to solve the high complexity of classical image processing, a quantum scheme for image sharpness estimation based on the Laplacian operator is proposed. The mean of grayscale gradients of all pixels is regarded as the sharpness estimation metric. A new quantum image representation model is presented by extending the Novel Enhanced Quantum Representation (NEQR) model, which is greatly useful

Clifford 3qubit states Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200401
Oscar PerdomoLet us denote by 𝒞n the Clifford group (the circuit or operations generated by Hadamard, π∕4 phase and the controlledNOT gates) and by 𝒬𝒞n the set of qubit states that can be prepared by circuits ...

Analysis of singleparticle nonlocality through the prism of weak measurements Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200228
Danko Georgiev; Eliahu CohenAlthough regarded today as an important resource in quantum information, nonlocality has yielded over the years many conceptual conundrums. Among the latter are nonlocal aspects of single particles which have been of major interest. In this paper, the nonlocality of single quanta is studied in a square nested Mach–Zehnder interferometer with spatially separated detectors using a delayed choice modification

The fundamental connections between classical Hamiltonian mechanics, quantum mechanics and information entropy Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200226
Gabriele Carcassi; Christine A. AidalaWe show that the main difference between classical and quantum systems can be understood in terms of information entropy. Classical systems can be considered the ones where the internal dynamics can be known with arbitrary precision while quantum systems can be considered the ones where the internal dynamics cannot be accessed at all. As information entropy can be used to characterize how much the

Continuous variable quantum perceptron Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200220
F. Benatti; S. Mancini; S. ManginiWe present a model of Continuous Variable Quantum Perceptron (CVQP), also referred to as neuron in the following, whose architecture implements a classical perceptron. The necessary nonlinearity is obtained via measuring the output qubit and using the measurement outcome as input to an activation function. The latter is chosen to be the socalled Rectified linear unit (ReLu) activation function by

Role of the filter functions in noise spectroscopy Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200219
Nicola Dalla Pozza; Stefano Gherardini; Matthias M. Müller; Filippo CarusoThe success of quantum noise sensing methods depends on the optimal interplay between properly designed control pulses and statistically informative measurement data on a specific quantumprobe observable. To enhance the information content of the data and reduce as much as possible the number of measurements on the probe, the filter orthogonalization method has been recently introduced. The latter

Evolution of quantum coherence induced by band gaps and initialstate preparation measurements Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200213
Filippo GiraldiThe evolution of quantum coherence in a qubit is analyzed, over short and long times, in case the qubit interacts with a bosonic environment. The distribution of the frequency modes exhibits a low...

New quantum constacyclic codes with length n=2(qm+1) Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200211
Junli Wang; Ruihu Li; Yang Liu; Hao SongBy studying the properties of q2cyclotomic cosets, the maximum designed distances of Hermitian dualcontaining constacyclic Bose–Chaudhuri–Hocquenghem (BCH) codes with length n=2(qm+1) are determined, where q is an odd prime power and m≥3 is an integer. Further, their dimensions are calculated precisely for the given designed distance. Consequently, via Hermitian Construction, many new quantum codes

Quantum frequency estimation with conditional states of continuously monitored independent dephasing channels Int. J. Quantum Inf. (IF 1.176) Pub Date : 20200207
Francesco Albarelli; Matteo A. C. Rossi; Marco G. GenoniWe discuss the problem of estimating a frequency via Nqubit probes undergoing independent dephasing channels that can be continuously monitored via homodyne or photodetection. We derive the corresponding analytical solutions for the conditional states, for generic initial states and for arbitrary efficiency of the continuous monitoring. For the detection strategies considered, we show that: (i) in