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  Subjects -> PHYSICS (Total: 798 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
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PHYSICS (581 journals)            First | 1 2 3 | Last

Showing 401 - 600 of 741 Journals sorted alphabetically
Nanoscale Research Letters     Open Access   (Followers: 3)
Nanospectroscopy     Open Access  
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 32)
Natural Science     Open Access   (Followers: 10)
Nature Communications     Open Access   (Followers: 125)
Nature Materials     Full-text available via subscription   (Followers: 56)
Nature Physics     Full-text available via subscription   (Followers: 37)
NDT & E International     Hybrid Journal   (Followers: 47)
Neutron News     Hybrid Journal  
New Journal of Physics     Open Access   (Followers: 19)
Noise & Vibration Worldwide     Full-text available via subscription   (Followers: 3)
Noise Notes     Full-text available via subscription   (Followers: 2)
Nondestructive Testing And Evaluation     Hybrid Journal   (Followers: 15)
Nonlinear Dynamics     Hybrid Journal   (Followers: 5)
Novel Superconducting Materials     Open Access  
npj Computational Materials     Open Access  
npj Microgravity     Open Access  
npj Quantum Information     Open Access  
NTM Zeitschrift für Geschichte der Wissenschaften, Technik und Medizin     Hybrid Journal   (Followers: 3)
Nuclear Engineering and Design     Hybrid Journal   (Followers: 10)
Nuclear Medicine and Biology     Hybrid Journal   (Followers: 3)
Open Journal of Biophysics     Open Access   (Followers: 1)
Open Journal of Fluid Dynamics     Open Access   (Followers: 11)
Open Journal of Microphysics     Open Access  
Open Physics     Open Access   (Followers: 3)
Optical Communications and Networking, IEEE/OSA Journal of     Full-text available via subscription   (Followers: 12)
Optofluidics, Microfluidics and Nanofluidics     Open Access   (Followers: 1)
Organic Electronics     Hybrid Journal   (Followers: 4)
Organic Photonics and Photovoltaics     Open Access   (Followers: 1)
PAJ: A Journal of Performance and Art     Hybrid Journal   (Followers: 12)
Particuology     Hybrid Journal  
Pattern Recognition in Physics     Open Access   (Followers: 1)
Pergamon Materials Series     Full-text available via subscription  
Phase Transitions and Critical Phenomena     Full-text available via subscription  
Philosophical Magazine     Hybrid Journal   (Followers: 3)
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences     Full-text available via subscription   (Followers: 8)
Philosophy and Foundations of Physics     Full-text available via subscription   (Followers: 1)
Physica B: Condensed Matter     Hybrid Journal   (Followers: 6)
physica status solidi (a)     Hybrid Journal   (Followers: 1)
physica status solidi (b)     Hybrid Journal   (Followers: 2)
physica status solidi (c)     Hybrid Journal   (Followers: 1)
Physica Status Solidi - Rapid Research Letters     Hybrid Journal   (Followers: 1)
Physical Communication     Hybrid Journal   (Followers: 1)
Physical Review C     Full-text available via subscription   (Followers: 14)
Physical Review Special Topics - Physics Education Research     Open Access   (Followers: 4)
Physical Review X     Open Access   (Followers: 9)
Physical Sciences Data     Full-text available via subscription   (Followers: 1)
Physical Sciences Reviews     Full-text available via subscription  
Physics - spotlighting exceptional research     Full-text available via subscription   (Followers: 1)
Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B     Full-text available via subscription   (Followers: 3)
Physics and Chemistry of Liquids: An International Journal     Hybrid Journal   (Followers: 1)
Physics and Chemistry of the Earth, Parts A/B/C     Hybrid Journal   (Followers: 6)
Physics and Materials Chemistry     Open Access   (Followers: 1)
Physics Essays     Full-text available via subscription   (Followers: 1)
Physics in Medicine & Biology     Full-text available via subscription   (Followers: 14)
Physics in Perspective     Hybrid Journal   (Followers: 2)
Physics International     Open Access   (Followers: 3)
Physics Letters A     Hybrid Journal   (Followers: 15)
Physics Letters B     Open Access   (Followers: 5)
Physics of Fluids     Hybrid Journal   (Followers: 32)
Physics of Life Reviews     Hybrid Journal   (Followers: 1)
Physics of Plasmas     Hybrid Journal   (Followers: 7)
Physics of the Dark Universe     Open Access   (Followers: 3)
Physics of the Solid State     Hybrid Journal   (Followers: 1)
Physics of Wave Phenomena     Hybrid Journal  
Physics Procedia     Open Access   (Followers: 1)
Physics Reports     Full-text available via subscription   (Followers: 3)
Physics Research International     Open Access   (Followers: 2)
Physics Today     Hybrid Journal   (Followers: 72)
Physics World     Full-text available via subscription   (Followers: 17)
Physics-Uspekhi     Full-text available via subscription  
Physik in unserer Zeit     Hybrid Journal   (Followers: 9)
Physik Journal     Hybrid Journal  
Plasma Physics and Controlled Fusion     Hybrid Journal   (Followers: 3)
Plasma Physics Reports     Hybrid Journal   (Followers: 2)
Pramana     Open Access   (Followers: 15)
Preview     Hybrid Journal  
Proceedings of the National Academy of Sciences     Full-text available via subscription   (Followers: 646)
Proceedings of the National Academy of Sciences, India Section A     Hybrid Journal   (Followers: 3)
Progress in Materials Science     Hybrid Journal   (Followers: 23)
Progress in Planning     Hybrid Journal  
Progress of Theoretical and Experimental Physics     Open Access  
Quantum Electronics     Full-text available via subscription   (Followers: 2)
Quantum Measurements and Quantum Metrology     Open Access  
Quantum Studies : Mathematics and Foundations     Hybrid Journal   (Followers: 3)
Quarterly Journal of Mechanics and Applied Mathematics     Hybrid Journal   (Followers: 3)
Radiation Effects and Defects in Solids     Hybrid Journal  
Radiation Measurements     Hybrid Journal   (Followers: 2)
Radiation Physics and Chemistry     Hybrid Journal   (Followers: 1)
Radiation Protection Dosimetry     Hybrid Journal   (Followers: 3)
Radiation Research     Full-text available via subscription   (Followers: 3)
Radiatsionnaya Gygiena = Radiation Hygiene     Open Access  
Radio Science     Full-text available via subscription   (Followers: 36)
Radiological Physics and Technology     Hybrid Journal  
Reflets de la physique     Full-text available via subscription  
Reports on Mathematical Physics     Full-text available via subscription   (Followers: 1)
Reports on Progress in Physics     Full-text available via subscription   (Followers: 3)
Research & Reviews : Journal of Physics     Full-text available via subscription   (Followers: 1)
Research in Drama Education     Hybrid Journal   (Followers: 10)
Research Journal of Physics     Open Access   (Followers: 14)
Results in Physics     Open Access   (Followers: 1)
Reviews in Mathematical Physics     Hybrid Journal  
Reviews in Physics     Open Access   (Followers: 1)
Reviews of Accelerator Science and Technology     Hybrid Journal   (Followers: 1)
Reviews of Geophysics     Full-text available via subscription   (Followers: 33)
Reviews of Modern Physics     Full-text available via subscription   (Followers: 28)
Revista Colombiana de Física     Open Access  
Revista de Física     Open Access  
Revista Mexicana de Astronomía y Astrofísica     Open Access  
Revista Mexicana de Física     Open Access  
Revista mexicana de física E     Open Access  
Rheologica Acta     Hybrid Journal   (Followers: 1)
Russian Journal of Mathematical Physics     Hybrid Journal  
Russian Journal of Nondestructive Testing     Hybrid Journal   (Followers: 4)
Russian Physics Journal     Hybrid Journal   (Followers: 1)
Samuel Beckett Today/Aujourd'hui     Full-text available via subscription   (Followers: 2)
Science and Technology of Nuclear Installations     Open Access   (Followers: 1)
Science China Physics, Mechanics & Astronomy     Hybrid Journal   (Followers: 2)
Scientific Reports     Open Access   (Followers: 37)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 46)
Sensor Letters     Full-text available via subscription   (Followers: 2)
Sensors and Actuators A: Physical     Hybrid Journal   (Followers: 124)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 4)
Shock and Vibration     Hybrid Journal   (Followers: 8)
Shock Waves     Hybrid Journal   (Followers: 5)
Small     Hybrid Journal   (Followers: 11)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 53)
Solid State Physics     Full-text available via subscription   (Followers: 1)
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 9)
Space Research Journal     Open Access   (Followers: 4)
Space Weather     Full-text available via subscription   (Followers: 16)
Spectral Analysis Review     Open Access  
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy     Hybrid Journal   (Followers: 17)
Spectrochimica Acta Part B: Atomic Spectroscopy     Hybrid Journal   (Followers: 17)
Spectroscopy and Spectral Analysis     Full-text available via subscription  
Spectroscopy Letters: An International Journal for Rapid Communication     Hybrid Journal   (Followers: 4)
Sri Lankan Journal of Physics     Open Access  
St. Petersburg Polytechnic University Journal : Physics and Mathematics     Open Access  
Strain     Hybrid Journal   (Followers: 2)
Strength of Materials     Hybrid Journal   (Followers: 6)
Structural Dynamics     Open Access   (Followers: 4)
Studies In Applied Mathematics     Hybrid Journal   (Followers: 1)
Superconductor Science and Technology     Hybrid Journal   (Followers: 2)
Surface Engineering     Hybrid Journal   (Followers: 3)
Surface Review and Letters     Hybrid Journal   (Followers: 1)
Surface Science Reports     Full-text available via subscription   (Followers: 15)
Surface Science Spectra     Hybrid Journal   (Followers: 1)
Surface Topography : Metrology and Properties     Full-text available via subscription  
Synchrotron Radiation News     Hybrid Journal   (Followers: 3)
Synthetic Metals     Hybrid Journal   (Followers: 4)
Technical Physics     Hybrid Journal  
Technical Physics Letters     Hybrid Journal  
Tectonics     Full-text available via subscription   (Followers: 12)
The European Physical Journal H     Hybrid Journal   (Followers: 2)
The European Physical Journal Plus     Open Access  
The International Journal of Multiphysics     Full-text available via subscription   (Followers: 1)
The Physics of Metals and Metallography     Hybrid Journal   (Followers: 16)
The Physics Teacher     Full-text available via subscription   (Followers: 103)
Theoretical and Computational Fluid Dynamics     Hybrid Journal   (Followers: 12)
Theoretical and Mathematical Physics     Hybrid Journal   (Followers: 6)
Topological Quantum Matter     Open Access  
Transport Phenomena in Nano and Micro Scales     Open Access  
Transport Theory and Statistical Physics     Hybrid Journal   (Followers: 4)
Tribology International     Hybrid Journal   (Followers: 41)
Tribology Letters     Hybrid Journal   (Followers: 5)
Tribotest     Hybrid Journal  
Turkish Journal of Physics     Open Access  
Ultrasonics     Hybrid Journal   (Followers: 5)
Ultrasonics Sonochemistry     Hybrid Journal   (Followers: 3)
Ultrasound in Medicine & Biology     Full-text available via subscription   (Followers: 8)
Universal Journal of Physics and Application     Open Access   (Followers: 1)
Unnes Physics Education Journal     Open Access   (Followers: 2)
Unnes Physics Journal     Open Access  
Waves, Wavelets and Fractals     Open Access  
Western Journal of Communication     Hybrid Journal   (Followers: 5)
Women & Performance: a journal of feminist theory     Hybrid Journal   (Followers: 5)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 11)
World Journal of Condensed Matter Physics     Open Access  
X-Acoustics: Imaging and Sensing : Photoacoustics, Thermoacoustics, Magnetoacoustics     Open Access  
Zeitschrift für angewandte Mathematik und Physik     Hybrid Journal   (Followers: 1)
Zeitschrift für Naturforschung A : A Journal of Physical Sciences     Open Access  

  First | 1 2 3 | Last

Journal Cover International Journal of Quantum Information
  [SJR: 0.304]   [H-I: 27]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0219-7499 - ISSN (Online) 1793-6918
   Published by World Scientific Homepage  [118 journals]
  • Fluxon-controlled quantum computer
    • Authors: Toshiyuki Fujii, Shigemasa Matsuo, Noriyuki Hatakenaka
      Abstract: International Journal of Quantum Information, Volume 14, Issue 07, October 2016.
      We propose a fluxon-controlled quantum computer incorporated with three-qubit quantum error correction using special gate operations, i.e. joint-phase and SWAP gate operations, inherent in capacitively coupled superconducting flux qubits. The proposed quantum computer acts exactly like a knitting machine at home.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-08T09:26:51Z
      DOI: 10.1142/S0219749916500404
       
  • JRSP of three-particle state via three tripartite GHZ class in quantum
           noisy channels
    • Authors: Babatunde James Falaye, Guo-Hua Sun, Oscar Camacho-Nieto, Shi-Hai Dong
      Abstract: International Journal of Quantum Information, Volume 14, Issue 07, October 2016.
      We present a scheme for joint remote state preparation (JRSP) of three-particle state via three tripartite Greenberger–Horne–Zeilinger (GHZ) entangled states as the quantum channel linking the parties. We use eight-qubit mutually orthogonal basis vector as measurement point of departure. The likelihood of success for this scheme has been found to be [math]. However, by putting some special cases into consideration, the chances can be ameliorated to [math] and 1. The effects of amplitude-damping noise, phase-damping noise and depolarizing noise on this scheme have been scrutinized and the analytical derivations of fidelities for the quantum noisy channels have been presented. We found that for [math], the states conveyed through depolarizing channel lose more information than phase-damping channel while the information loss through amplitude damping channel is most minimal.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-08T09:26:49Z
      DOI: 10.1142/S0219749916500349
       
  • Restoring genuine tripartite entanglement under local amplitude damping
    • Authors: Mazhar Ali
      Abstract: International Journal of Quantum Information, Volume 14, Issue 07, October 2016.
      We investigate the possibility to restore genuine tripartite entanglement under local amplitude damping. We show that it is possible to protect genuine entanglement using CNOT and Hadamard gates. We analyze several ordering of such recovery operations. We find that for recovery operations applied after exposing qubits to decoherence, there is no enhancement in lifetime of genuine entanglement. Actual retrieval of entanglement is only possible when reversal scheme is applied before and after the decoherence process. We find that retrieval of entanglement for mixture of [math] state with white noise is more evident than the respective mixture of [math] state. We also find the retrieval of entanglement for similar mixture of [math] state as well.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-08T09:26:46Z
      DOI: 10.1142/S0219749916500398
       
  • Revival of Bell nonlocality across a quantum spin chain
    • Authors: J. Batle, M. Abutalib, S. Abdalla, Ahmed Farouk
      Abstract: International Journal of Quantum Information, Volume 14, Issue 07, October 2016.
      The transmission of pure and mixed states along a quantum spin chain is investigated. Nonlocality between two qubits will evolve as it is transmitted through the quantum channel in a way that may violate or not the Clauser–Horne–Shimony–Holt (CHSH) Bell inequality at different times. This violation of local realism is analogue to the so-called sudden death and sudden birth features of entanglement. In the quantum channel, which will turn to be a damping one, some (mixed) states will be preferred according to the nature of the quantum correlations that are preserved during the evolution along the spin chain.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-08T09:26:44Z
      DOI: 10.1142/S0219749916500374
       
  • Finding structural anomalies in complete graphs using scattering quantum
           walks
    • Authors: Xiling Xue, Hanwu Chen, Zhihao Liu
      Abstract: International Journal of Quantum Information, Volume 14, Issue 07, October 2016.
      The search for structural anomalies in a complete graph, [math], using scattering quantum walks (SQWs) is investigated in this study. A complete graph with a second graph, [math], attached to one of its vertices is referred to as external structural anomaly. The structural change within a complete graph is called internal structural anomaly. First, an example with [math] being a triangle is presented to illustrate the problem. Then, a general proof is provided to show that the vertex to which [math] is attached can be found in [math] time steps as long as the connectivity between [math] and [math] is far less than [math]. Finally, two types of internal structural anomalies, namely, a complete graph with a missing edge and that with an extra loop, are considered. These two anomalies can be solved in a similar manner as external anomalies in [math] time steps. These examples demonstrate that Cottrell’s formalism in star graphs can be applied more generally.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-08T09:26:35Z
      DOI: 10.1142/S0219749916500350
       
  • Entanglement acquirement from continuous variable system
    • Authors: Ying Shi, Li Zheng, Yu-Jie Liu, Chong Li
      Abstract: International Journal of Quantum Information, Volume 14, Issue 07, October 2016.
      We investigate a remote establishment of entanglement sharing resource through entanglement transferred from continuous variables to discrete variables. The analysis of generation of entanglement for two initially unentangled atoms with different fields are performed and simultaneous observations of the max entanglement acquirement is given. Based on our result, we suppose that the max and stable entanglement acquirement can be obtained with appropriate field parameters.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-08T09:26:33Z
      DOI: 10.1142/S0219749916500386
       
  • Improved quantum dilation and erosion operations
    • Authors: Suzhen Yuan, Xia Mao, Lijiang Chen, Xiaofa Wang
      Abstract: International Journal of Quantum Information, Volume 14, Issue 07, October 2016.
      To reduce the time complexity of quantum morphology operations, two kinds of improved quantum dilation and erosion operations are proposed. Quantum parallelism is well used in the design of these operations. Consequently, the time complexity is greatly reduced compared with the previous quantum dilation and erosion operations. The neighborhood information of each pixel is needed in the process of designing quantum dilation and erosion operations. In order to get the neighborhood information, quantum position shifting transformation is utilized, which can make the neighborhood information store in a quantum image set. In this image set, the neighborhood information of pixel at location ([math], [math]) is stored at the same location ([math], [math]) of other images in the image set. All the pixels will be processed simultaneously, which is the performance of quantum parallelism. The time complexity analysis shows that these quantum operations have polynomial-time complexity which is much lower than the exponential-time complexity of the previous version.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-08T09:26:27Z
      DOI: 10.1142/S0219749916500362
       
  • Scheme for quantum state manipulation in coupled cavities
    • Authors: Jin-Zhong Lin
      Abstract: International Journal of Quantum Information, Ahead of Print.
      By controlling the parameters of the system, the effective interaction between different atoms is achieved in different cavities. Based on the interaction, scheme to generate three-atom Greenberger–Horne–Zeilinger (GHZ) is proposed in coupled cavities. Spontaneous emission of excited states and decay of cavity modes can be suppressed efficiently. In addition, the scheme is robust against the variation of hopping rate between cavities.
      Citation: International Journal of Quantum Information
      PubDate: 2016-12-05T07:17:13Z
      DOI: 10.1142/S0219749917500046
       
  • Optimal pumping strength for BBM92 key distribution protocol
    • Authors: Janusz Czub, Ryszard Veynar, Wiesław Laskowski, Marcin Pawłowski
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In a typical, entanglement-based quantum key distribution (QKD) protocols the maximally entangled, singlet states are used. The standard way to generate them is to use parametric down conversion with low intensity laser beams. This way the probability to produce two or more entangled pairs is negligible. However, one obtains it at a cost of a large likelihood of producing no particles at all. In this work, we ask the question if this approach is the optimal one from the point of view of key generation rate. For a case study, we take BBM 92 protocol and find the optimal intensity of the beam. We show optimal intensities are much higher than the ones typically used. Our results can be generalized to other protocols based on singlet states.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-25T09:09:34Z
      DOI: 10.1142/S0219749916500490
       
  • Electrically tunable quantum interfaces between photons and spin qubits in
           carbon nanotube quantum dots
    • Authors: Ze-Song Shen, Fang-Yu Hong
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We present a new scheme for quantum interfaces (QIs) to accomplish the interconversion of photonic qubits and spin qubits based on optomechanical resonators and the spin–orbit-induced interactions in suspended carbon nanotube quantum dots (CNTQDs). This interface implements quantum spin transducers and further enables electrical manipulation of local electron spin qubits, which lays the foundation for all-electrical control of state transfer protocols between two distant quantum nodes in a quantum network. We numerically evaluate the state transfer processes and proceed to estimate the effect of each coupling strength on the operation fidelities. The simulation suggests that high operation fidelities are obtainable under realistic experimental conditions.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-23T06:04:38Z
      DOI: 10.1142/S0219749916500477
       
  • Influences of signal processing methods on photon number resolving
           capability of multi-pixel photon counter
    • Authors: Guoqing Zhang, Xiuxiu Gao, Lina Liu
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Influences of signal processing methods on photon number resolving capability of multi-pixel photon counter (MPPC) were studied in this work. Results show that the photon number resolving (PNR) capability of MPPC can be greatly improved by waveform integration of the avalanche pulses of MPPC, relative to the histograms of the output pulse amplitudes. Up to 47 photon-equivalent peaks can be distinguished in the PNR spectrum with pulsed light repetition frequency of 80[math]MHz and 5[math]ns time gate. The analog to digital converter (ADC) in oscilloscope with more bit resolution may be beneficial for the PNR of MPPC.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-23T06:04:36Z
      DOI: 10.1142/S0219749916500465
       
  • Biseparability of 3-qubits density matrices using Hilbert–Schmidt
           decompositions: Sufficient conditions and explicit expressions
    • Authors: Y. Ben-Aryeh, A. Mann
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Hilbert–Schmidt (HS) decompositions and Frobenius norms are used to analyze biseparability of 3-qubit systems, with particular emphasis on density matrices with maximally disordered subsystems (MDS) and on the [math] state mixed with white noise. The biseparable form of a MDS density matrix is obtained by using the Bell states of a 2-qubit subsystem, multiplied by density matrices of the third qubit, which include the relevant HS parameters. Using our methods, a sufficient condition and explicit biseparability of the [math] state mixed with white noise are given. They are compared with the sufficient condition for explicit full separability given in a previous work.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-23T06:04:33Z
      DOI: 10.1142/S0219749916500441
       
  • Convex decomposition of dimension-altering quantum channels
    • Authors: Dong-Sheng Wang
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Quantum channels, which are completely positive and trace preserving mappings, can alter the dimension of a system, e.g. a quantum channel from a qubit to a qutrit. We study the convex set properties of dimension-altering quantum channels, and particularly the channel decomposition problem in terms of convex sum of extreme channels. We provide various quantum circuit representations of extreme and generalized extreme channels, which can be employed in an optimization to approximately decompose an arbitrary channel. Numerical simulations of low-dimensional channels are performed to demonstrate our channel decomposition scheme.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-17T08:43:38Z
      DOI: 10.1142/S0219749916500453
       
  • Two-qubit separability probabilities as joint functions of the Bloch radii
           of the qubit subsystems
    • Authors: Paul B. Slater
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We detect a certain pattern of behavior of separability probabilities [math] for two-qubit systems endowed with Hilbert–Schmidt (HS), and more generally, random induced measures, where [math] and [math] are the Bloch radii ([math]) of the qubit reduced states ([math]). We observe a relative repulsion of radii effect, that is [math], except for rather narrow “crossover” intervals [math]. Among the seven specific cases we study are, firstly, the “toy” seven-dimensional [math]-states model and, then, the fifteen-dimensional two-qubit states obtained by tracing over the pure states in [math]-dimensions, for [math], with [math] corresponding to HS (flat/Euclidean) measure. We also examine the real (two-rebit) [math], the [math]-states [math], and Bures (minimal monotone)–for which no nontrivial crossover behavior is observed–instances. In the two [math]-states cases, we derive analytical results; for [math], we propose formulas that well-fit our numerical results; and for the other scenarios, rely presently upon large numerical analyses. The separability probability crossover regions found expand in length (lower [math]) as [math] increases. This report continues our efforts [P. B. Slater, arXiv:1506.08739] to extend the recent work of [S. Milz and W. T. Strunz, J. Phys. A 48 (2015) 035306.] from a univariate ([math]) framework — in which they found separability probabilities to hold constant with [math] — to a bivariate ([math]) one. We also analyze the two-qutrit and qubit–qutrit counterparts reported in Quantum Inform. Process. 15 (2016) 3745 in this context, and study two-qubit separability probabilities of the form [math]. A physics.stack.exchange link to a contribution by Mark Fischler addressing, in considerable detail, the construction of suitable bivariate distributions is indicated at the end of the paper.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-15T06:19:31Z
      DOI: 10.1142/S0219749916500428
       
  • High-capacity quantum secure direct communication using hyper-entanglement
           of photonic qubits
    • Authors: Jiarui Cai, Ziwen Pan, Tie-Jun Wang, Sihai Wang, Chuan Wang
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Hyper-entanglement is a system constituted by photons entangled in multiple degrees of freedom (DOF), being considered as a promising way of increasing channel capacity and guaranteeing powerful eavesdropping safeguard. In this work, we propose a coding scheme based on a 3-particle hyper-entanglement of polarization and orbital angular momentum (OAM) system and its application as a quantum secure direct communication (QSDC) protocol. The OAM values are specially encoded by Fibonacci sequence and the polarization carries information by defined unitary operations. The internal relations of the secret message enhances security due to principle of quantum mechanics and Fibonacci sequence. We also discuss the coding capacity and security property along with some simulation results to show its superiority and extensibility.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-15T06:19:29Z
      DOI: 10.1142/S021974991650043X
       
  • Quantum group signature scheme based on controlled quantum teleportation
    • Authors: F. L. Chen, Z.  F. Han
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Group signature scheme is a method of allowing a member of a group to sign a message anonymously on behalf of the group. The group administrator is in charge of adding group members and has the ability to reveal the original signer in the event of disputes. Based on controlled quantum teleportation with three-particle entangled W states, we propose a new quantum group signature scheme with designated receiver. Security analysis proves that the proposed scheme possesses the characteristics of group signature and resists the usual attacks. Compared with previous proposed schemes, this scheme follows security definition of group signature fully and meets its basic requirements.
      Citation: International Journal of Quantum Information
      PubDate: 2016-11-04T03:15:41Z
      DOI: 10.1142/S0219749916500416
       
  • Noise effects on conflicting interest quantum games with incomplete
           information
    • Authors: Haozhen Situ, Zhiming Huang, Cai Zhang
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Noise effects can be harmful to quantum information systems. In the present paper, we study noise effects in the context of quantum games with incomplete information, which have more complicated structure than quantum games with complete information. The effects of several paradigmatic noises on three newly proposed conflicting interest quantum games with incomplete information are studied using numerical optimization method. Intuitively noises will bring down the payoffs. However, we find that in some situations the outcome of the games under the influence of noise effects are counter-intuitive. Sometimes stronger noise may lead to higher payoffs. Some properties of the game, like quantum advantage, fairness and equilibrium, are invulnerable to some kinds of noises.
      Citation: International Journal of Quantum Information
      PubDate: 2016-09-21T07:49:12Z
      DOI: 10.1142/S0219749916500337
       
  • Relations between entanglement and purity in non-Markovian dynamics
    • Authors: Carlos A. González-Gutiérrez, Ricardo Román-Ancheyta, Diego Espitia, Rosario Lo Franco
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Knowledge of the relationships among different features of quantumness, like entanglement and state purity, is important from both fundamental and practical viewpoints. Yet, this issue remains little explored in dynamical contexts for open quantum systems. We address this problem by studying the dynamics of entanglement and purity for two-qubit systems using paradigmatic models of radiation-matter interaction, with a qubit being isolated from the environment (spectator configuration). We show the effects of the corresponding local quantum channels on an initial two-qubit pure entangled state in the concurrence–purity diagram and find the conditions which enable dynamical closed formulas of concurrence, used to quantify entanglement, as a function of purity. We finally discuss the usefulness of these relations in assessing entanglement and purity thresholds which allow noisy quantum teleportation. Our results provide new insights about how different properties of composite open quantum systems behave and relate each other during quantum evolutions.
      Citation: International Journal of Quantum Information
      PubDate: 2016-09-19T07:36:41Z
      DOI: 10.1142/S0219749916500313
       
  • Optimization of quantum Hamiltonian evolution: from two projection
           operators to local Hamiltonians
    • Authors: Apoorva Patel, Anjani Priyadarsini
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Given a quantum Hamiltonian and its evolution time, the corresponding unitary evolution operator can be constructed in many different ways, corresponding to different trajectories between the desired end-points and different series expansions. A choice among these possibilities can then be made to obtain the best computational complexity and control over errors. It is shown how a construction based on Grover’s algorithm scales linearly in time and logarithmically in the error bound, and is exponentially superior in error complexity to the scheme based on the straightforward application of the Lie–Trotter formula. The strategy is then extended first to simulation of any Hamiltonian that is a linear combination of two projection operators, and then to any local efficiently computable Hamiltonian. The key feature is to construct an evolution in terms of the largest possible steps instead of taking small time steps. Reflection operations and Chebyshev expansions are used to efficiently control the total error on the overall evolution, without worrying about discretization errors for individual steps. We also use a digital implementation of quantum states that makes linear algebra operations rather simple to perform.
      Citation: International Journal of Quantum Information
      PubDate: 2016-09-14T01:52:34Z
      DOI: 10.1142/S0219749916500271
       
  • Quantum backflow effect and nonclassicality
    • Authors: Francesco Albarelli, Tommaso Guaita, Matteo G. A. Paris
      Abstract: International Journal of Quantum Information, Ahead of Print.
      The quantum backflow effect is a counterintuitive behavior of the probability current of a free particle, which may be negative even for states with vanishing negative momentum component. Here, we address the notion of nonclassicality arising from the backflow effect, i.e. from the negativity of the probability current, and analyze its relationships with the notion of nonclassicality based on the negativity of the Wigner function. Our results show that backflow is linked to a different, and in fact more restrictive, notion of nonclassicality, the negativity of the Wigner function being only a necessary prerequisite for its occurrence. This hierarchical structure may be confirmed by looking at the addition of thermal noise, which more easily destroys the negativity of the probability current than the negativity of the Wigner function itself.
      Citation: International Journal of Quantum Information
      PubDate: 2016-09-14T01:52:10Z
      DOI: 10.1142/S0219749916500325
       
 
 
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