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  Subjects -> PHYSICS (Total: 784 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (19 journals)
    - NUCLEAR PHYSICS (48 journals)
    - OPTICS (90 journals)
    - PHYSICS (569 journals)
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    - THERMODYNAMICS (29 journals)

PHYSICS (569 journals)            First | 1 2 3 4 5 6 | Last

International Journal of Modern Physics A     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics B     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics C     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics D     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics E     Hybrid Journal   (Followers: 3)
International Journal of Nanomanufacturing     Hybrid Journal   (Followers: 1)
International Journal of Nanoscience     Hybrid Journal   (Followers: 1)
International Journal of Nanotechnology     Hybrid Journal   (Followers: 5)
International Journal of Non-Linear Mechanics     Hybrid Journal   (Followers: 4)
International Journal of Physical Sciences     Open Access  
International Journal of Physics     Open Access  
International Journal of PIXE     Hybrid Journal   (Followers: 1)
International Journal of Plasticity     Hybrid Journal   (Followers: 6)
International Journal of Quantum Information     Hybrid Journal  
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal   (Followers: 2)
International Journal of Solids and Structures     Hybrid Journal   (Followers: 10)
International Journal of Superconductivity     Open Access  
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 8)
International Journal of Theoretical and Applied Multiscale Mechanics     Hybrid Journal   (Followers: 2)
International Journal of Theoretical and Mathematical Physics     Open Access   (Followers: 1)
International Journal of Theoretical Physics     Hybrid Journal   (Followers: 2)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 7)
International Materials Reviews     Hybrid Journal   (Followers: 12)
Inverse Problems     Hybrid Journal   (Followers: 5)
IOP Conference Series: Materials Science and Engineering     Open Access   (Followers: 3)
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 2)
Izvestiya Atmospheric and Oceanic Physics     Hybrid Journal   (Followers: 3)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 3)
Japanese Journal of Applied Physics     Full-text available via subscription   (Followers: 4)
JCP : BioChemical Physics     Hybrid Journal   (Followers: 1)
JETP Letters     Hybrid Journal   (Followers: 3)
Journal of Adhesion Science and Technology     Hybrid Journal   (Followers: 7)
Journal of Advanced Physics     Full-text available via subscription  
Journal of Advances in Physics     Open Access   (Followers: 3)
Journal of Applied Mathematics and Mechanics     Full-text available via subscription   (Followers: 5)
Journal of Applied Mathematics and Physics     Open Access  
Journal of Applied Mechanics and Technical Physics     Hybrid Journal   (Followers: 3)
Journal of Applied Physics     Hybrid Journal   (Followers: 79)
Journal of Applied Remote Sensing     Full-text available via subscription   (Followers: 11)
Journal of Applied Spectroscopy     Hybrid Journal   (Followers: 7)
Journal of Astrophysics     Open Access  
Journal of Astrophysics and Astronomy     Open Access   (Followers: 11)
Journal of Basic and Applied Physics     Open Access   (Followers: 1)
Journal of Building Physics     Hybrid Journal   (Followers: 1)
Journal of Chromatographic Science     Hybrid Journal   (Followers: 20)
Journal of Complex Networks     Hybrid Journal   (Followers: 1)
Journal of Composite Materials     Hybrid Journal   (Followers: 85)
Journal of Computational Methods in Physics     Open Access  
Journal of Computational Physics     Hybrid Journal   (Followers: 62)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 1)
Journal of Dynamic Systems, Measurement, and Control     Full-text available via subscription   (Followers: 12)
Journal of Elasticity     Hybrid Journal   (Followers: 2)
Journal of Electrical Bioimpedance     Full-text available via subscription   (Followers: 2)
Journal of Electron Spectroscopy and Related Phenomena     Hybrid Journal   (Followers: 2)
Journal of Electronic Materials     Hybrid Journal   (Followers: 5)
Journal of Electronics Cooling and Thermal Control     Open Access   (Followers: 1)
Journal of Engineering Materials and Technology     Full-text available via subscription   (Followers: 15)
Journal of Engineering Physics and Thermophysics     Hybrid Journal  
Journal of Experimental and Theoretical Physics     Hybrid Journal   (Followers: 3)
Journal of Fire Sciences     Hybrid Journal   (Followers: 3)
Journal of Geometry and Physics     Full-text available via subscription  
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 15)
Journal of Gravity     Open Access  
Journal of High Energy Astrophysics     Full-text available via subscription  
Journal of High Energy Physics     Hybrid Journal   (Followers: 2)
Journal of Hydrogels     Full-text available via subscription  
Journal of Hyperspectral Remote Sensing     Open Access   (Followers: 1)
Journal of Imaging     Open Access  
Journal of Information Display     Hybrid Journal  
Journal of Intelligent Material Systems and Structures     Hybrid Journal   (Followers: 3)
Journal of Lightwave Technology     Hybrid Journal   (Followers: 6)
Journal of Low Frequency Noise, Vibration and Active Control     Full-text available via subscription   (Followers: 6)
Journal of Luminescence     Hybrid Journal   (Followers: 2)
Journal of Magnetic Resonance     Hybrid Journal   (Followers: 4)
Journal of Materials Engineering and Performance     Hybrid Journal   (Followers: 9)
Journal of Materials Physics and Chemistry     Open Access  
Journal of Materials Science     Hybrid Journal   (Followers: 17)
Journal of Materials Science : Materials in Electronics     Hybrid Journal   (Followers: 4)
Journal of Materials Science : Materials in Medicine     Hybrid Journal   (Followers: 6)
Journal of Mathematical Fluid Mechanics     Hybrid Journal   (Followers: 4)
Journal of Mathematical Physics     Hybrid Journal   (Followers: 3)
Journal of Medical Imaging and Health Informatics     Full-text available via subscription  
Journal of Medical Ultrasonics     Hybrid Journal   (Followers: 2)
Journal of Micro/Nanolithography MEMS and MOEMS     Hybrid Journal   (Followers: 3)
Journal of Modern Physics     Open Access   (Followers: 2)
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 6)
Journal of Motor Behavior     Hybrid Journal   (Followers: 9)
Journal of Multiscale Modeling     Hybrid Journal  
Journal of Nanophotonics     Full-text available via subscription   (Followers: 4)
Journal of Neutron Research     Hybrid Journal  
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 4)
Journal of Nonlinear Dynamics     Open Access  
Journal of Nonlinear Mathematical Physics     Hybrid Journal   (Followers: 1)
Journal of Nuclear Physics, Material Sciences, Radiation and Applications     Open Access  
Journal of Optics     Hybrid Journal   (Followers: 2)
Journal of Physical and Chemical Reference Data     Hybrid Journal   (Followers: 3)
Journal of Physical Chemistry B     Full-text available via subscription   (Followers: 30)
Journal of Physical Chemistry C     Full-text available via subscription   (Followers: 24)
Journal of Physical Oceanography     Full-text available via subscription   (Followers: 10)
Journal of Physical Organic Chemistry     Hybrid Journal   (Followers: 7)

  First | 1 2 3 4 5 6 | Last

Journal Cover   International Journal of Quantum Information
  [SJR: 0.595]   [H-I: 22]   Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0219-7499 - ISSN (Online) 1793-6918
   Published by World Scientific Homepage  [120 journals]
  • Fidelity, sub-fidelity, super-fidelity and their preservers
    • Authors: Li Wang, Jinchuan Hou, Kan He
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Sub- and super-fidelity describe respectively the lower and super bound of fidelity of quantum states. In this paper, we obtain several properties of sub- and super-fidelity for both finite- and infinite-dimensional quantum systems. Furthermore, let H be a separable complex Hilbert space and ϕ : 𝒮(H) → 𝒮(H) a map, where 𝒮(H) denotes the convex set of all states on H. We show that, if dimH < ∞, or, if dimH = ∞ and ϕ is surjective, then the following statements are equivalent: (1) ϕ preserves the super-fidelity; (2) ϕ preserves the fidelity; (3) ϕ preserves the sub-fidelity; (4) there exists a unitary or an anti-unitary operator U on H such that ϕ(ρ) = U ρU† for all ρ ∈ 𝒮(H).
      Citation: International Journal of Quantum Information
      PubDate: Tue, 19 May 2015 02:37:48 GMT
      DOI: 10.1142/S0219749915500276
       
  • Three-slit ghost interference and non-local duality
    • Authors: Mohd Asad Siddiqui
      Abstract: International Journal of Quantum Information, Ahead of Print.
      A three-slit ghost interference experiment with entangled photons is theoretically analyzed using wave-packet dynamics. A non-local duality relation is derived which connects the path distinguishability of one photon to the interference visibility of the other.
      Citation: International Journal of Quantum Information
      PubDate: Tue, 19 May 2015 02:37:48 GMT
      DOI: 10.1142/S0219749915500227
       
  • The Hilbert space of conditional clauses
    • Authors: Charles Francis
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In the absence of a satisfactory interpretation of quantum theory, physical law lacks physical basis. This paper reviews the orthodox, or Dirac–von Neumann interpretation, and makes explicit that Hilbert space describes propositions about measurement results. Kets are defined as conditional clauses referring to measurements in a formal language. It is seen that these clauses are elements of a Hilbert space, such that addition is logical disjunction, the dual space consists of consequent clauses, and the inner product is a set of statements in the subjunctive mood. The probability interpretation gives truth values for corresponding future tense statements when the initial state is actually prepared and the final state is to be measured. The mathematical structure of quantum mechanics is formulated in terms of discrete measurement results at finite level of accuracy and does not depend on an assumption of a substantive, or background, space–time continuum. A continuum of kets, x〉 for x ∈ ℝ3, is constructed from linear combinations of kets in a finite basis. The inner product can be expressed either as a finite sum or as an integral. Discrete position functions are uniquely embedded into smooth wave functions in such a way that differential operators are defined. It is shown that the choice of basis has no effect on underlying physics (quantum covariance). The Dirac delta has a representation as a smooth function. Operators do not in general have an integral form. The Schrödinger equation is shown from the requirements of the probability interpretation. It is remarked that a formal construction of quantum electrodynamics (qed) avoiding divergence problems has been completed using finite dimensional Hilbert space. I conclude that quantum mechanics makes statements about the world with clear physical meaning, such that space is emergent from particle interactions and has no fundamental role.
      Citation: International Journal of Quantum Information
      PubDate: Tue, 19 May 2015 02:37:48 GMT
      DOI: 10.1142/S0219749915500264
       
  • On quantum codes obtained from cyclic codes over A2
    • Authors: Abdullah Dertli, Yasemin Cengellenmis, Senol Eren
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In this paper, quantum codes from cyclic codes over A2 = F2 + uF2 + vF2 + uvF2, u2 = u,v2 = v,uv = vu, for arbitrary length n have been constructed. It is shown that if C is self orthogonal over A2, then so is Ψ(C), where Ψ is a Gray map. A necessary and sufficient condition for cyclic codes over A2 that contains its dual has also been given. Finally, the parameters of quantum error correcting codes are obtained from cyclic codes over A2.
      Citation: International Journal of Quantum Information
      PubDate: Tue, 19 May 2015 02:37:43 GMT
      DOI: 10.1142/S0219749915500318
       
  • A generalization of Schmidt number for multipartite states
    • Authors: Yu Guo, Heng Fan
      Abstract: International Journal of Quantum Information, Ahead of Print.
      The Schmidt number is of crucial importance in characterizing the bipartite pure states. We explore and propose here a generalization of Schmidt number for states in multipartite systems. It is shown to be entanglement monotonic and valid for both pure and mixed states. In addition, the corresponding generalization of multipartite Schmidt coefficients is introduced. Our approach is applicable for systems with arbitrary number of parties and for arbitrary dimensions.
      Citation: International Journal of Quantum Information
      PubDate: Fri, 08 May 2015 07:48:40 GMT
      DOI: 10.1142/S0219749915500252
       
  • New optimal quantum convolutional codes
    • Authors: Shixin Zhu, Liqi Wang, Xiaoshan Kai
      Abstract: International Journal of Quantum Information, Ahead of Print.
      One of the most challenges to prove the feasibility of quantum computers is to protect the quantum nature of information. Quantum convolutional codes are aimed at protecting a stream of quantum information in a long distance communication, which are the correct generalization to the quantum domain of their classical analogs. In this paper, we construct some classes of quantum convolutional codes by employing classical constacyclic codes. These codes are optimal in the sense that they attain the Singleton bound for pure convolutional stabilizer codes.
      Citation: International Journal of Quantum Information
      PubDate: Tue, 05 May 2015 07:06:36 GMT
      DOI: 10.1142/S0219749915500197
       
  • Heuristic for estimation of multiqubit genuine multipartite entanglement
    • Authors: Paulo E. M. F. Mendonça, Marcelo A. Marchiolli, Gerard J. Milburn
      Abstract: International Journal of Quantum Information, Ahead of Print.
      For every N-qubit density matrix written in the computational basis, an associated "X-density matrix" can be obtained by vanishing all entries out of the main- and anti-diagonals. It is very simple to compute the genuine multipartite (GM) concurrence of this associated N-qubit X-state, which, moreover, lower bounds the GM-concurrence of the original (non-X) state. In this paper, we rely on these facts to introduce and benchmark a heuristic for estimating the GM-concurrence of an arbitrary multiqubit mixed state. By explicitly considering two classes of mixed states, we illustrate that our estimates are usually very close to the standard lower bound on the GM-concurrence, being significantly easier to compute. In addition, while evaluating the performance of our proposed heuristic, we provide the first characterization of GM-entanglement in the steady states of the driven Dicke model at zero temperature.
      Citation: International Journal of Quantum Information
      PubDate: Tue, 05 May 2015 07:06:35 GMT
      DOI: 10.1142/S0219749915500239
       
  • Topological basis realization for BMW algebra and Heisenberg XXZ spin
           chain model
    • Authors: Bo Liu, Kang Xue, Gangcheng Wang, Ying Liu, Chunfang Sun
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In this paper, we study three-dimensional (3D) reduced Birman–Murakami–Wenzl (BMW) algebra based on topological basis theory. Several examples of BMW algebra representations are reviewed. We also discuss a special solution of BMW algebra, which can be used to construct Heisenberg XXZ model. The theory of topological basis provides a useful method to solve quantum spin chain models. It is also shown that the ground state of XXZ spin chain is superposition state of topological basis.
      Citation: International Journal of Quantum Information
      PubDate: Tue, 28 Apr 2015 04:05:10 GMT
      DOI: 10.1142/S0219749915500173
       
  • Quantum blind signature with an offline repository
    • Authors: J. Ribeiro, A. Souto, P. Mateus
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We propose a quantum blind signature scheme that achieves perfect security under the assumption of an honest offline repository. The security of the protocol also relies on perfect private quantum channels, which are achievable using quantum one-time pads with keys shared via a quantum key distribution (QKD) protocol. The proposed approach ensures that signatures cannot be copied and that the sender must compromise to a single message, which are important advantages over classical protocols for certain applications.
      Citation: International Journal of Quantum Information
      PubDate: Fri, 24 Apr 2015 07:13:18 GMT
      DOI: 10.1142/S0219749915500161
       
  • Quantum stabilizer codes from Abelian and non-Abelian groups association
           schemes
    • Authors: Avaz Naghipour, Mohammad Ali Jafarizadeh, Sedaghat Shahmorad
      Abstract: International Journal of Quantum Information, Ahead of Print.
      A new method for the construction of the binary quantum stabilizer codes is provided, where the construction is based on Abelian and non-Abelian groups association schemes. The association schemes based on non-Abelian groups are constructed by bases for the regular representation from U6n, T4n, V8n and dihedral D2n groups. By using Abelian group association schemes followed by cyclic groups and non-Abelian group association schemes a list of binary stabilizer codes up to 40 qubits is given in tables 4, 5 and 10. Moreover, several binary stabilizer codes of minimum distances 5, 7 and 8 with good quantum parameters is presented. The preference of this method specially for Abelian group association schemes is that one can construct any binary quantum stabilizer code with any distance by using the commutative structure of association schemes.
      Citation: International Journal of Quantum Information
      PubDate: Fri, 24 Apr 2015 07:13:01 GMT
      DOI: 10.1142/S0219749915500215
       
  • Wigner rotation via Fermi–Walker transport and relativistic EPR
           correlations in the Schwarzschild spacetime
    • Authors: K. Bakke, C. Furtado, A. M. de M. Carvalho
      Abstract: International Journal of Quantum Information, Ahead of Print.
      The Wigner rotation angle for a particle in a circular motion in the Schwarzschild spacetime is obtained via the Fermi–Walker transport of spinors. Then, by applying the Wentzel, Kramers, Brillouin (WKB) approximation, a possible application of the Fermi–Walker transport of spinors in relativistic Einstein–Podolsky–Rosen (EPR) correlations is discussed, where it is shown that the spins of the correlated particle undergo a precession in an analogous way to that obtained by Terashima and Ueda [H. Terashima and M. Ueda, Phys. Rev. A69, 032113 (2004)] via the application of successive infinitesimal Lorentz transformations. Moreover, from the WKB approach, it is also shown that the degree of violation of the Bell inequality depends on the Wigner rotation angle obtained via the Fermi–Walker transport. Finally, the relativistic effects from the geometry of the spacetime and the accelerated motion of the correlated particles is discussed in the nonrelativistic limit.
      Citation: International Journal of Quantum Information
      PubDate: Fri, 24 Apr 2015 07:12:51 GMT
      DOI: 10.1142/S0219749915500203
       
  • The one-way information deficit for a class of two-qubit states
    • Authors: H. Eftekhari, E. Faizi
      Abstract: International Journal of Quantum Information, Ahead of Print.
      So far, one-way information deficit (OWID) has been calculated explicitly only for Bell-diagonal states and the four-parameter family of X-states with additional assumptions and expressions for more general quantum states are not known. In this paper, we derive explicit expressions for OWID for a larger class of two-qubit states, namely, a five-parameter family of two-qubit states. The dynamic behavior of the OWID under decoherence channel is investigated and it is shown that the OWID is more robust against the decoherence than the entanglement.
      Citation: International Journal of Quantum Information
      PubDate: Tue, 21 Apr 2015 03:44:27 GMT
      DOI: 10.1142/S0219749915500124
       
  • Secure identity-based encryption in the quantum random oracle model
    • Authors: Mark Zhandry
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We give the first proof of security for an identity-based encryption (IBE) scheme in the quantum random oracle model. This is the first proof of security for any scheme in this model that does not rely on the assumed existence of so-called quantum-secure pseudorandom functions (PRFs). Our techniques are quite general and we use them to obtain security proofs for two random oracle hierarchical IBE schemes and a random oracle signature scheme, all of which have previously resisted quantum security proofs, even assuming quantum-secure PRFs. We also explain how to remove quantum-secure PRFs from prior quantum random oracle model proofs. We accomplish these results by developing new tools for arguing that quantum algorithms cannot distinguish between two oracle distributions. Using a particular class of oracle distributions that we call semi-constant distributions, we argue that the aforementioned cryptosystems are secure against quantum adversaries.
      Citation: International Journal of Quantum Information
      PubDate: Tue, 21 Apr 2015 03:44:24 GMT
      DOI: 10.1142/S0219749915500148
       
  • Classical extension of quantum-correlated separable states
    • Authors: G. Bellomo, A. Plastino, A. R. Plastino
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Li and Luo [Phys. Rev. A78 (2008) 024303] discovered a remarkable relation between discord and entanglement. It establishes that all separable states can be obtained via reduction of a classically-correlated state "living" in a space of larger dimension. Starting from this result, we discuss here an optimal classical extension of separable states and explore this notion for low-dimensional systems. We find that the larger the dimension of the classical extension, the larger the discord in the original separable state. Further, we analyze separable states of maximum discord in ℂ2 ⊗ ℂ2 and their associated classical extensions showing that, from the reduction of a classical state in (ℂ2 ⊗ ℂ3) ⊗ ℂ2, one can obtain a separable state of maximum discord in ℂ2 ⊗ ℂ2.
      Citation: International Journal of Quantum Information
      PubDate: Tue, 21 Apr 2015 03:44:24 GMT
      DOI: 10.1142/S021974991550015X
       
  • Generation of multi-photon entanglement
    • Authors: Dong Xie, An Min Wang
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We propose a new scheme to generate multi-photon entanglement in two steps. First, we utilize a superconductor to create multi-quantum-dot entanglement; secondly, we use the input photon to transfer it into multi-photon entanglement. Moreover, the maximum probability for the swap of photon and quantum-dot qubits is close to unity for a single input Gaussian photon. More importantly, by mapping the multi-quantum-dot state into coherent states of oscillators, such as cavity modes, the multi-quantum-dot entanglement in our scheme can be protected from the decoherence induced by the noise. Thus, it is possible to generate more than eight spatially separated entangled photons in the realistic experimental conditions.
      Citation: International Journal of Quantum Information
      PubDate: Wed, 15 Apr 2015 05:14:33 GMT
      DOI: 10.1142/S0219749915500185
       
  • Three-party quantum summation without a trusted third party
    • Authors: Cai Zhang, Zhi-Wei Sun, Xiang Huang, Dong-Yang Long
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In this paper, we propose a quantum summation protocol, in which the genuinely maximally entangled six-qubit states found by Borras et al., are employed. Because of the excellent properties of the genuinely maximally entangled six-qubit states, the presented protocol allows three participants to compute the summation of their inputs without the help of a trusted third party and preserve the privacy of their inputs, respectively. The participants do not need any unitary operations. In addition, the proposed protocol utilizes the one-step quantum transmission and therefore is congenitally free from Trojan horse attacks. We have also shown that our protocol is secure against other well-known attacks over lossy and noisy quantum channels.
      Citation: International Journal of Quantum Information
      PubDate: Thu, 02 Apr 2015 02:04:16 GMT
      DOI: 10.1142/S0219749915500112
       
  • Boson-sampling with non-interacting fermions
    • Authors: V. S. Shchesnovich
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We explore the conditions under which identical particles in unitary linear networks behave as the other species, i.e. bosons as fermions and fermions as bosons. It is found that the Boson-sampling (BS) computer of Aaronson and Arkhipov can be implemented in an interference experiment with non-interacting fermions in an appropriately entangled state. Moreover, a scheme is proposed which simulates the scattershot version of the BS computer by preparing, on the fly, the required entangled state of fermions from an unentangled one.
      Citation: International Journal of Quantum Information
      PubDate: Thu, 02 Apr 2015 02:04:16 GMT
      DOI: 10.1142/S0219749915500136
       
  • High performance reconciliation for continuous-variable quantum key
           distribution with LDPC code
    • Authors: Dakai Lin, Duan Huang, Peng Huang, Jinye Peng, Guihua Zeng
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Reconciliation is a significant procedure in a continuous-variable quantum key distribution (CV-QKD) system. It is employed to extract secure secret key from the resulted string through quantum channel between two users. However, the efficiency and the speed of previous reconciliation algorithms are low. These problems limit the secure communication distance and the secure key rate of CV-QKD systems. In this paper, we proposed a high-speed reconciliation algorithm through employing a well-structured decoding scheme based on low density parity-check (LDPC) code. The complexity of the proposed algorithm is reduced obviously. By using a graphics processing unit (GPU) device, our method may reach a reconciliation speed of 25 Mb/s for a CV-QKD system, which is currently the highest level and paves the way to high-speed CV-QKD.
      Citation: International Journal of Quantum Information
      PubDate: Mon, 23 Mar 2015 11:21:00 GMT
      DOI: 10.1142/S0219749915500100
       
  • Minimum remote state preparation of an arbitrary two-level one-atom state
           via cavity QED
    • Authors: Yahong Wang, Changshui Yu
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In this paper, we propose three schemes for remotely state preparation (RSP) an arbitrary two-level one-atom state via cavity quantum electro dynamics (QED) with minimal resources consumption. In the first case, a Greenberger–Horne–Zeilinger (GHZ) state is used as quantum channel; in the second case, the sender needs to construct an quantum channel with both of the assistant of cavity QED and the knowledge about the state to be remotely prepared. In each scheme, only 1 cbit and 1 ebit are needed with the aid of cavity QED. In the third case, we combine the first two protocols and give a theoretical proposal for controlled RSP with only 2 cbits and 1 ebit resources consumption.
      Citation: International Journal of Quantum Information
      PubDate: Fri, 27 Feb 2015 03:32:23 GMT
      DOI: 10.1142/S0219749915500094
       
  • Entanglement entropy in quasi-symmetric multi-qubit states
    • Authors: Zhi-Hua Li, An-Min Wang
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We generalize the symmetric multi-qubit states to their q-analogs, whose basis vectors are identified with the q-Dicke states. We study the entanglement entropy in these states and find that entanglement is extruded towards certain regions of the system due to the inhomogeneity aroused by q-deformation. We also calculate entanglement entropy in ground states of a related q-deformed Lipkin–Meshkov–Glick (LMG) model and show that the singularities of entanglement can correctly signify the quantum phase transition points for different strengths of q-deformation.
      Citation: International Journal of Quantum Information
      PubDate: Wed, 25 Feb 2015 02:17:12 GMT
      DOI: 10.1142/S0219749915500070
       
  • Manipulation of the stationary entanglement of three atoms coupled to a
           common environment
    • Authors: Fang Su
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In this work, we study the dynamics of three entangled atoms coupled to a common structured reservoir. The atoms are initially prepared in different W-like states characterized by different relative phases. We examine the roles of initial relative phases on the energy transfers among the individual atoms as well as atomic entanglement dynamics. We show that the features of quantum interferences induced by initial relative phases greatly affect the energy transfers and entanglement dynamics. In particular, a suitable choice of initial phases can increase atomic stationary entanglement over their initial value. The results imply a possible control strategy for atomic entanglement dynamics.
      Citation: International Journal of Quantum Information
      PubDate: Tue, 24 Feb 2015 07:59:47 GMT
      DOI: 10.1142/S0219749915500082
       
  • Limitations on quantum dimensionality reduction
    • Authors: sales@wspc.com.sg (Aram W. Harrow)
      Abstract: International Journal of Quantum Information, Ahead of Print.
      The Johnson–Lindenstrauss Lemma is a classic result which implies that any set of n real vectors can be compressed to O(logn) dimensions while only distorting pairwise Euclidean distances by a constant factor. Here we consider potential extensions of this result to the compression of quantum states. We show that, by contrast with the classical case, there does not exist any distribution over quantum channels that significantly reduces the dimension of quantum states while preserving the 2-norm distance with high probability. We discuss two tasks for which the 2-norm distance is indeed the correct figure of merit. In the case of the trace norm, we show that the dimension of low-rank mixed states can be reduced by up to a square root, but that essentially no dimensionality reduction is possible for highly mixed states.
      PubDate: Wed, 04 Jun 2014 03:58:56 GMT
      DOI: 10.1142/S0219749914400012
       
  • EXPLICIT RELATION BETWEEN ALL LOWER BOUND TECHNIQUES FOR QUANTUM QUERY
           COMPLEXITY
    • Authors: LOÏCK MAGNIN et al
      Abstract: International Journal of Quantum Information, Volume 0, Issue 0, Ahead of Print.

      PubDate: Mon, 25 Nov 2013 06:28:10 GMT
      DOI: 10.1142/S0219749913500597
       
 
 
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