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  Subjects -> PHYSICS (Total: 798 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   (Followers: 1)
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 32)
Natural Science     Open Access   (Followers: 10)
Nature Communications     Open Access   (Followers: 130)
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: 4)
Optical Communications and Networking, IEEE/OSA Journal of     Full-text available via subscription   (Followers: 13)
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: 4)
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: 73)
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: 668)
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   (Followers: 1)
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: 29)
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: 118)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 5)
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: 54)
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: 13)
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: 99)
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: 2)
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]
  • Entanglement of two-electron spin states in a double quantum dot
    • Authors: V. G. Bagrov, D. M. Gitman, A. D. Levin, M. S. Meireles
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Recently, an implementation of a universal set of one- and two-quantum-bit gates for quantum computation using spin states of coupled single-electron quantum dots was proposed. It was demonstrated that it is possible to execute a coherent control of a quantum system based on two-electron spin states in a double quantum dot, allowing state preparation, coherent manipulation, and projective readout. This possibility is based on rapid electrical control of the spin exchange interaction. These results motivated us to develop a formal theoretical study of the corresponding model of two coupled spins placed in a magnetic field and subjected to a time-dependent mutual Heisenberg interaction. Using possible exact solutions of the corresponding quantum problem, we study entangling of different separable initial states in this model. It is demonstrated that the entanglement due to a time-dependent Heisenberg interaction is dominating in comparison with the entanglement due to the action of an external magnetic field.
      Citation: International Journal of Quantum Information
      PubDate: 2017-01-05T06:02:50Z
      DOI: 10.1142/S021974991750006X
       
  • Erratum:" On the existence of a local quasi hidden variable (LqHV) model
           for each N-qudit state and the maximal quantum violation of Bell
           inequalities"
    • Authors: Elena R. Loubenets
      Abstract: International Journal of Quantum Information, Volume 14, Issue 08, December 2016.

      Citation: International Journal of Quantum Information
      PubDate: 2016-12-27T08:18:02Z
      DOI: 10.1142/S0219749916920027
       
  • Solutions to the mean king’s problem: Higher-dimensional quantum
           error-correcting codes
    • Authors: Masakazu Yoshida, Toru Kuriyama, Jun Cheng
      Abstract: International Journal of Quantum Information, Volume 14, Issue 08, December 2016.
      Mean king’s problem is a kind of quantum state discrimination problems. In the problem, we try to discriminate eigenstates of noncommutative observables with the help of classical delayed information. The problem has been investigated from the viewpoint of error detection and correction. We construct higher-dimensional quantum error-correcting codes against error corresponding to the noncommutative observables. Any code state of the codes provides a way to discriminate the eigenstates correctly with the classical delayed information.
      Citation: International Journal of Quantum Information
      PubDate: 2016-12-27T08:17:52Z
      DOI: 10.1142/S0219749916500489
       
  • Author Index Volume 14 (2016)
    • Abstract: International Journal of Quantum Information, Volume 14, Issue 08, December 2016.

      Citation: International Journal of Quantum Information
      PubDate: 2016-12-27T08:17:51Z
      DOI: 10.1142/S021974991699001X
       
  • Construction of new quantum MDS codes derived from constacyclic codes
    • Authors: Divya Taneja, Manish Gupta, Rajesh Narula, Jaskaran Bhullar
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Obtaining quantum maximum distance separable (MDS) codes from dual containing classical constacyclic codes using Hermitian construction have paved a path to undertake the challenges related to such constructions. Using the same technique, some new parameters of quantum MDS codes have been constructed here. One set of parameters obtained in this paper has achieved much larger distance than work done earlier. The remaining constructed parameters of quantum MDS codes have large minimum distance and were not explored yet.
      Citation: International Journal of Quantum Information
      PubDate: 2016-12-29T08:32:51Z
      DOI: 10.1142/S0219749917500083
       
  • An efficient controlled quantum secure direct communication and
           authentication by using four particle cluster states
    • Authors: Milad Nanvakenari, Monireh Houshmand
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In this paper, a three-party controlled quantum secure direct communication and authentication (QSDCA) protocol is proposed by using four particle cluster states via a quantum one-time pad and local unitary operations. In the present scheme, only under the permission of the controller, the sender and the receiver can implement secure direct communication successfully. But under any circumstances, Charlie cannot obtain the secret message. Eavesdropping detection and identity authentication are achieved with the help of the previously shared reusable base identity strings of users. This protocol is unconditionally secure in both ideal and practical noisy cases. In one transmission, a qubit of each four particle cluster state is used as controller’s permission and the same qubit with another qubit are used to recover two classical bits of information. In the proposed scheme, the efficiency is improved compared with the previous works.
      Citation: International Journal of Quantum Information
      PubDate: 2016-12-29T08:32:48Z
      DOI: 10.1142/S0219749917500022
       
  • Quantum mutual information matrices
    • Authors: Feng Liu
      Abstract: International Journal of Quantum Information, Ahead of Print.
      For any [math]-partite state [math], we define its quantum mutual information matrix as an [math][math][math][math][math] matrix whose [math]-entry is given by quantum mutual information [math]. Although each entry of quantum mutual information matrix, like its classical counterpart, is also used to measure bipartite correlations, the similarity ends here: quantum mutual information matrices are not always positive semidefinite even for collections of up to 3-partite states. In this work, we define the genuine n-partite mutual information which can be easily calculated. This definition is symmetric, nonnegative, bounded and more accurate for measuring multipartite states.
      Citation: International Journal of Quantum Information
      PubDate: 2016-12-16T07:37:54Z
      DOI: 10.1142/S0219749917500058
       
  • Protocols for quantum binary voting
    • Authors: Kishore Thapliyal, Rishi Dutt Sharma, Anirban Pathak
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Two new protocols for quantum binary voting are proposed. One of the proposed protocols is designed using a standard scheme for controlled deterministic secure quantum communication (CDSQC), and the other one is designed using the idea of quantum cryptographic switch, which uses a technique known as permutation of particles. A few possible alternative approaches to accomplish the same task (quantum binary voting) have also been discussed. Security of the proposed protocols is analyzed. Further, the efficiencies of the proposed protocols are computed, and are compared with that of the existing protocols. The comparison has established that the proposed protocols are more efficient than the existing protocols.
      Citation: International Journal of Quantum Information
      PubDate: 2016-12-16T07:37:54Z
      DOI: 10.1142/S0219749917500071
       
  • Local quantum uncertainty for a class of two-qubit [math] states and
           quantum correlations dynamics under decoherence
    • Authors: L. Jebli, B. Benzimoune, M. Daoud
      Abstract: International Journal of Quantum Information, Ahead of Print.
      A special emphasis is devoted to the concept of local quantum uncertainty as an indicator of quantum correlations. We study quantum discord for a class of two-qubit states parametrized by two parameters. Quantum discord based on local quantum uncertainty, von Neumann entropy and trace distance (Schatten 1-norm) are explicitly derived and compared. The behavior of quantum correlations, quantified via local quantum uncertainty, under decoherence effects is investigated. We show that the discordlike local quantum uncertainty exhibits the possibility of freezing behavior during its evolution.
      Citation: International Journal of Quantum Information
      PubDate: 2016-12-16T07:37:52Z
      DOI: 10.1142/S0219749917500010
       
  • A construction of quantum turbo product codes based on CSS-type quantum
           convolutional codes
    • Authors: Hailin Xiao, Ju Ni, Wu Xie, Shan Ouyang
      Abstract: International Journal of Quantum Information, Ahead of Print.
      As in classical coding theory, turbo product codes (TPCs) through serially concatenated block codes can achieve approximatively Shannon capacity limit and have low decoding complexity. However, special requirements in the quantum setting severely limit the structures of turbo product codes (QTPCs). To design a good structure for QTPCs, we present a new construction of QTPCs with the interleaved serial concatenation of [math]-type quantum convolutional codes (QCCs). First, [math]-type QCCs are proposed by exploiting the theory of CSS-type quantum stabilizer codes and QCCs, and the description and the analysis of encoder circuit are greatly simplified in the form of Hadamard gates and C-NOT gates. Second, the interleaved coded matrix of QTPCs is derived by quantum permutation SWAP gate definition. Finally, we prove the corresponding relation on the minimum Hamming distance of QTPCs associated with classical TPCs, and describe the state diagram of encoder and decoder of QTPCs that have a highly regular structure and simple design idea.
      Citation: International Journal of Quantum Information
      PubDate: 2016-12-16T07:37:52Z
      DOI: 10.1142/S0219749917500034
       
  • 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
       
  • 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
       
 
 
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