for Journals by Title or ISSN
for Articles by Keywords
help
  Subjects -> PHYSICS (Total: 793 journals)
    - ELECTRICITY AND MAGNETISM (10 journals)
    - MECHANICS (20 journals)
    - NUCLEAR PHYSICS (48 journals)
    - OPTICS (90 journals)
    - PHYSICS (572 journals)
    - SOUND (22 journals)
    - THERMODYNAMICS (31 journals)

PHYSICS (572 journals)            First | 1 2 3 4 5 6 | Last

International Journal of Microstructure and Materials Properties     Hybrid Journal   (Followers: 7)
International Journal of Microwave Science and Technology     Open Access   (Followers: 4)
International Journal of Modeling, Simulation, and Scientific Computing     Hybrid Journal   (Followers: 1)
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  
International Journal of Nanoscience     Hybrid Journal  
International Journal of Nanotechnology     Hybrid Journal   (Followers: 6)
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: 12)
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: 2)
International Journal of Theoretical Physics     Hybrid Journal   (Followers: 2)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 8)
International Letters of Chemistry, Physics and Astronomy     Open Access  
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: 4)
Izvestiya Atmospheric and Oceanic Physics     Hybrid Journal   (Followers: 2)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Japanese Journal of Applied Physics     Full-text available via subscription   (Followers: 3)
JCP : BioChemical Physics     Hybrid Journal   (Followers: 2)
JETP Letters     Hybrid Journal   (Followers: 2)
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: 6)
Journal of Applied Mathematics and Mechanics     Full-text available via subscription   (Followers: 5)
Journal of Applied Mathematics and Physics     Open Access   (Followers: 1)
Journal of Applied Mechanics and Technical Physics     Hybrid Journal   (Followers: 3)
Journal of Applied Physics     Hybrid Journal   (Followers: 75)
Journal of Applied Remote Sensing     Full-text available via subscription   (Followers: 13)
Journal of Applied Spectroscopy     Hybrid Journal   (Followers: 8)
Journal of Astrophysics     Open Access  
Journal of Astrophysics and Astronomy     Open Access   (Followers: 10)
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: 21)
Journal of Complex Networks     Hybrid Journal   (Followers: 1)
Journal of Composite Materials     Hybrid Journal   (Followers: 149)
Journal of Computational Methods in Physics     Open Access  
Journal of Computational Physics     Hybrid Journal   (Followers: 54)
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: 3)
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: 3)
Journal of Electronics Cooling and Thermal Control     Open Access   (Followers: 2)
Journal of Engineering Materials and Technology     Full-text available via subscription   (Followers: 17)
Journal of Engineering Physics and Thermophysics     Hybrid Journal  
Journal of Experimental and Theoretical Physics     Hybrid Journal   (Followers: 2)
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: 17)
Journal of Gravity     Open Access  
Journal of High Energy Astrophysics     Full-text available via subscription   (Followers: 1)
Journal of High Energy Physics     Hybrid Journal   (Followers: 5)
Journal of Hydrogels     Full-text available via subscription  
Journal of Hyperspectral Remote Sensing     Open Access   (Followers: 2)
Journal of Imaging     Open Access   (Followers: 1)
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: 4)
Journal of Magnetic Resonance     Hybrid Journal   (Followers: 5)
Journal of Materials Engineering and Performance     Hybrid Journal   (Followers: 26)
Journal of Materials Physics and Chemistry     Open Access   (Followers: 1)
Journal of Materials Science     Hybrid Journal   (Followers: 19)
Journal of Materials Science : Materials in Electronics     Hybrid Journal   (Followers: 3)
Journal of Materials Science : Materials in Medicine     Hybrid Journal   (Followers: 5)
Journal of Mathematical Fluid Mechanics     Hybrid Journal   (Followers: 5)
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: 7)
Journal of Motor Behavior     Hybrid Journal   (Followers: 9)
Journal of Multiscale Modeling     Hybrid Journal  
Journal of Nanophotonics     Full-text available via subscription   (Followers: 3)
Journal of Nepal Physical Society     Open Access  
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 6)
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: 5)
Journal of Physical and Chemical Reference Data     Hybrid Journal   (Followers: 5)
Journal of Physical Chemistry B     Full-text available via subscription   (Followers: 36)

  First | 1 2 3 4 5 6 | Last

Journal Cover International Journal of Quantum Information
  [SJR: 0.595]   [H-I: 22]   [0 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  [119 journals]
  • Relative entropy of entanglement of two-qubit [math]-invariant states
    • Authors: Zhen Wang, Zhi-Xi Wang
      Abstract: International Journal of Quantum Information, Ahead of Print.
      It is strictly proved that a two-qubit [math]-invariant state reaches its relative entropy of entanglement (REE) by the separable state having the same matrix structure. We also formulate three quadratic equations for the corresponding closest separable state (CSS) of [math]-invariant states by their symmetric property. Thus, the CSS of [math]-invariant state can be provided. Furthermore, to illustrate our result we consider two concrete examples.
      Citation: International Journal of Quantum Information
      PubDate: 2016-01-27T01:35:41Z
      DOI: 10.1142/S0219749915500586
       
  • Explicit constructions of all separable two-qubits density matrices and
           related problems for three-qubits systems
    • Authors: Y. Ben-Aryeh, A. Mann
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Explicitly separable density matrices are constructed for all separable two-qubits states based on Hilbert–Schmidt (HS) decompositions. For density matrices which include only two-qubits correlations the number of HS parameters is reduced to 3 by using local rotations, and for two-qubits states which include single qubit measurements, the number of parameters is reduced to 4 by local Lorentz transformations. For both cases, we related the absolute values of the HS parameters to probabilities, and the outer products of various Pauli matrices were transformed to pure state density matrices products. We discuss related problems for three-qubits. For n-qubits correlation systems ([math]) the sufficient condition for separability may be improved by local transformations, related to high order singular value decompositions (SVDs).
      Citation: International Journal of Quantum Information
      PubDate: 2016-01-27T01:35:38Z
      DOI: 10.1142/S0219749915500616
       
  • Security of direct communication quantum channel with feedback
    • Authors: Constantin V. Usenko
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In the direct communication quantum channels, the authorized recipient (Bob) and the non-authorized recipient (Eve) have different abilities for verification of received information. Bob can apply the feedback to commit the sender (Alice) to perform verification. Eve has to use for verification an indirect method based on the measurement of a set of incompatible observables enough for determination of the coding basis used by Alice. In the protocol of direct communication, regular modification of coding basis and masking it with an equilibrium in average information carrier density matrix prevents reconstruction of coding basis by the results of Eve’s measurements of an arbitrary set of observables. This provides unconditional security of the channel.
      Citation: International Journal of Quantum Information
      PubDate: 2016-01-27T01:35:35Z
      DOI: 10.1142/S0219749915500628
       
  • Entanglement in a spin ring with anisotropic interactions
    • Authors: Marcos Gaudiano, Omar Osenda
      Abstract: International Journal of Quantum Information, Ahead of Print.
      The relationship between entanglement and anisotropy is studied in small spin chains with periodic boundary conditions. The Hamiltonian of the spin chains is given by a slight modification of the dipolar Hamiltonian. The effect of the anisotropy is analyzed using the concurrence shared by spin pairs, but the study is not restricted to nearest-neighbor (NN) entanglement. It is shown that, under rather general conditions, the inclusion of anisotropic terms diminishes the entanglement shared between the spins of the chain irrespective of its range or its magnetic character.
      Citation: International Journal of Quantum Information
      PubDate: 2016-01-15T01:51:27Z
      DOI: 10.1142/S0219749915500574
       
  • Algebraic and group structure for bipartite anisotropic Ising model on a
           non-local basis
    • Authors: Francisco Delgado
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Entanglement is considered a basic physical resource for modern quantum applications as Quantum Information and Quantum Computation. Interactions based on specific physical systems able to generate and sustain entanglement are subject to deep research to get understanding and control on it. Atoms, ions or quantum dots are considered key pieces in quantum applications because they are elements in the development toward a scalable spin-based quantum computer through universal and basic quantum operations. Ising model is a type of interaction generating entanglement in quantum systems based on matter. In this work, a general bipartite anisotropic Ising model including an inhomogeneous magnetic field is analyzed in a non-local basis. This model summarizes several particular models presented in literature. When evolution is expressed in the Bell basis, it shows a regular block structure suggesting a [math] decomposition. Then, their algebraic properties are analyzed in terms of a set of physical parameters which define their group structure. In particular, finite products of pulses in this interaction are analyzed in terms of [math] covering. Thus, evolution denotes remarkable properties, in particular those related potentially with entanglement and control, which give a fruitful arena for further quantum developments and generalization.
      Citation: International Journal of Quantum Information
      PubDate: 2016-01-14T08:37:31Z
      DOI: 10.1142/S0219749915500550
       
  • Implementation of the quantum Fourier transform on a hybrid
           qubit–qutrit NMR quantum emulator
    • Authors: Shruti Dogra; Arvind, Kavita Dorai
      Abstract: International Journal of Quantum Information, Ahead of Print.
      The quantum Fourier transform (QFT) is a key ingredient of several quantum algorithms and a qudit-specific implementation of the QFT is hence an important step toward the realization of qudit-based quantum computers. This work develops a circuit decomposition of the QFT for hybrid qudits based on generalized Hadamard and generalized controlled-phase gates, which can be implemented using selective rotations in NMR. We experimentally implement the hybrid qudit QFT on an NMR quantum emulator, which uses four qubits to emulate a single qutrit coupled to two qubits.
      Citation: International Journal of Quantum Information
      PubDate: 2016-01-14T08:37:26Z
      DOI: 10.1142/S0219749915500598
       
  • The multistability in the coupled semiconductor microcavities
    • Authors: Yang Zhang, Jun Zhang, Shao-Xiong Wu, Chang-Shui Yu
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We study the nonlinear phenomena of the coupled semiconductor microcavities driven by coherent lasers in different coupling regimes. It is shown that the bistability and multistability in the strong-coupling regime are gradually generated or eliminated by properly adjusting the coupling strength or the amplitude of the input pump laser. The proposed system serves as a good candidate for the diverse control optical switch and the potential applications.
      Citation: International Journal of Quantum Information
      PubDate: 2016-01-11T09:15:15Z
      DOI: 10.1142/S0219749915500537
       
  • Enhancement of non-Markovianity by interference of two reservoirs
    • Abstract: International Journal of Quantum Information, Volume 13, Issue 06, September 2015.
      We study the effect of the interference between two independent non-Markovian reservoirs on the non-Markovianity of a two-level system. We find that the interference can enhance the non-Markovianity of the system. The additive master equation (ME) is invalid even if only one of the two reservoirs is non-Markovian, while it is a good approximation when all reservoirs are Markovian. We also derive the two states uniqueness for a two-level system coupled to structured reservoirs which maximize the measure of non-Markovianity defined by Breuer et al. [Phys. Rev. Lett. 103 (2009) 210401].
      Citation: International Journal of Quantum Information
      PubDate: 2015-12-01T05:20:10Z
      DOI: 10.1142/S0219749915500483
       
  • Quantum walk public-key cryptographic system
    • Abstract: International Journal of Quantum Information, Ahead of Print.
      Quantum Cryptography is a rapidly developing field of research that benefits from the properties of Quantum Mechanics in performing cryptographic tasks. Quantum walks are a powerful model for quantum computation and very promising for quantum information processing. In this paper, we present a quantum public-key cryptographic system based on quantum walks. In particular, in the proposed protocol the public-key is given by a quantum state generated by performing a quantum walk. We show that the protocol is secure and analyze the complexity of public key generation and encryption/decryption procedures.
      Citation: International Journal of Quantum Information
      PubDate: 2015-12-28T02:37:21Z
      DOI: 10.1142/S0219749915500501
       
  • Quantum direct communication protocol strengthening against
           Pavičić’s attack
    • Authors: Bo Zhang, Wei-Xu Shi, Jian Wang, Chao-Jing Tang
      Abstract: International Journal of Quantum Information, Ahead of Print.
      A quantum circuit providing an undetectable eavesdropping of information in message mode, which compromises all two-state [math]-[math] quantum direct communication (QDC) protocols, has been recently proposed by Pavičić [Phys. Rev. A 87 (2013) 042326]. A modification of the protocol’s control mode is proposed, which improves users’ 25% detection probability of Eve to 50% at best, as that in ping-pong protocol. The modification also improves the detection probability of Wójcik’s attack [Phys. Rev. Lett 90 (2003) 157901] to 75% at best. The resistance against man-in-the-middle (MITM) attack as well as the discussion of security for four Bell state protocols is presented. As a result, the protocol security is strengthened both theoretically and practically, and quantum advantage of superdense coding is restored.
      Citation: International Journal of Quantum Information
      PubDate: 2015-12-28T02:37:21Z
      DOI: 10.1142/S0219749915500525
       
  • A limit law of the return probability for a quantum walk on a hexagonal
           lattice
    • Authors: Takuya Machida
      Abstract: International Journal of Quantum Information, Ahead of Print.
      A return probability of random walks is one of the interesting subjects. As it is well known, the return probability strongly depends on the structure of the space where the random walker moves. On the other hand, the return probability of quantum walks, which are quantum models corresponding to random walks, has also been investigated to some extend lately. In this paper, we take care of a discrete-time three-state quantum walk on a hexagonal lattice from the view point of mathematics. The mathematical result shows a limit of the return probability when the walker starts off at the origin. The result of the limit tells us about a possibility of localization at the position and a dependence of localization on the initial state.
      Citation: International Journal of Quantum Information
      PubDate: 2015-12-28T02:37:20Z
      DOI: 10.1142/S0219749915500549
       
  • Interpretation of generalized matrix functions via geometric measure of
           quantum entanglement
    • Authors: Haixia Chang, Vehbi E. Paksoy, Fuzhen Zhang
      Abstract: International Journal of Quantum Information, Ahead of Print.
      By using representation theory and irreducible characters of the symmetric group, we introduce character dependent states and study their entanglement via geometric measure. We also present a geometric interpretation of generalized matrix functions via this entanglement analysis.
      Citation: International Journal of Quantum Information
      PubDate: 2015-12-10T08:55:17Z
      DOI: 10.1142/S0219749915500495
       
  • Secure N-dimensional simultaneous dense coding and applications
    • Abstract: International Journal of Quantum Information, Ahead of Print.
      Simultaneous dense coding (SDC) guarantees that Bob and Charlie simultaneously receive their respective information from Alice in their respective processes of dense coding. The idea is to use the so-called locking operation to “lock” the entanglement channels, thus requiring a joint unlocking operation by Bob and Charlie in order to simultaneously obtain the information sent by Alice. We present some new results on SDC: (1) We propose three SDC protocols, which use different N-dimensional entanglement (Bell state, W state and GHZ state). (2) Besides the quantum Fourier transform, two new locking operators are introduced (the double controlled-NOT operator and the SWAP operator). (3) In the case that spatially distant Bob and Charlie have to finalize the protocol by implementing the unlocking operation through communication, we improve our protocol’s fairness, with respect to Bob and Charlie, by implementing the unlocking operation in series of steps. (4) We improve the security of SDC against the intercept–resend attack. (5) We show that SDC can be used to implement a fair contract signing protocol. (6) We also show that the N-dimensional quantum Fourier transform can act as the locking operator in simultaneous teleportation of N-level quantum systems.
      Citation: International Journal of Quantum Information
      PubDate: 2015-12-10T07:42:36Z
      DOI: 10.1142/S0219749915500513
       
  • Optimality of entropic uncertainty relations
    • Abstract: International Journal of Quantum Information, Ahead of Print.
      The entropic uncertainty relation proven by Maassen and Uffink for arbitrary pairs of two observables is known to be nonoptimal. Here, we call an uncertainty relation optimal, if the lower bound can be attained for any value of either of the corresponding uncertainties. In this work, we establish optimal uncertainty relations by characterizing the optimal lower bound in scenarios similar to the Maassen–Uffink type. We disprove a conjecture by Englert et al. and generalize various previous results. However, we are still far from a complete understanding and, based on numerical investigation and analytical results in small dimension, we present a number of conjectures.
      Citation: International Journal of Quantum Information
      PubDate: 2015-11-25T11:22:45Z
      DOI: 10.1142/S0219749915500458
       
  • Thermal quantum correlations in a two-qubit Heisenberg XYZ model with
           different magnetic fields
    • Authors: Zheng Hu, Yu-Chen Wang, Xi-Wen Hou
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Two kinds of thermal quantum correlations, measured respectively by quantum discord (QD) and the generalized negativity (GN), are studied for various magnetic fields, couplings, and temperatures in a two-qubit Heisenberg XYZ model. It is shown that QD and GN can exhibit a similar behavior in some regions of magnetic field, coupling, and temperature, while they behave in a contrary manner in other regions. For example, QD may increase with suitable magnetic fields, couplings, and temperature when GN decreases. QD is more robust against temperature than GN, and can reveal a kink at a suitable coupling at finite temperature while GN cannot. Moreover, a nearly unchanged QD or GN can be obtained in a large region of magnetic field, coupling, and temperature. These adjustable QD and GN via the varied magnetic field, coupling, and temperature may have significant applications in quantum information processing.
      Citation: International Journal of Quantum Information
      PubDate: 2015-11-20T11:21:21Z
      DOI: 10.1142/S021974991550046X
       
  • Dynamics of entanglement and non-classical correlation for four-qubit GHZ
           state
    • Authors: P. Espoukeh, R. Rahimi, S. Salimi, P. Pedram
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Many-qubit entanglement is crucial for quantum information processing although its exploitation is hindered by the detrimental effects of the environment surrounding the many-qubit system. It is thus of importance to study the dynamics of general multipartite non-classical correlation, including but not restricted to entanglement, under noise. We did this study for four-qubit Greenberger–Horne–Zeilinga (GHZ) state under most common noises in an experiment and found that non-classical correlation is more robust than entanglement except when it is imposed to dephasing channel. Quantum discord presents a sudden transition in its dynamics for Pauli-X and Pauli-Y noises as well as Bell-diagonal states interacting with dephasing reservoirs and it decays monotonically for Pauli-Z and isotropic noises.
      Citation: International Journal of Quantum Information
      PubDate: 2015-11-09T07:06:01Z
      DOI: 10.1142/S0219749915500446
       
  • Entanglement distribution in a two-dimensional 5-site frustrated [math]
           spin system
    • Authors: Mojtaba Jafarpour, Soghra Ghanavati, Davood Afshar
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We have studied several ground states and their entanglement structure for a two-dimensional 5-site frustrated [math]–[math] system in the presence and absence of an external magnetic field. We have used concurrence as a measure of bipartite entanglement and the Meyer–Wallach measure and its generalizations as the measures of multipartite entanglement. They provide a total of eight measures which lead to 30 entanglement quantities for each possible ground state. Computing these 30 quantities for several ground states, we have provided a detailed exposition of the entanglement distribution in each state. We have also categorized them into separable states, not showing entanglement for any bipartition; globally-entangled states, showing entanglement for all the bipartitions, and the states in between. It turns out that by adjusting the external magnetic field, conditioned on the values of the interaction parameters, one may generate specific ground states belonging to a specific class, appropriate for specific tasks in quantum information theory.
      Citation: International Journal of Quantum Information
      PubDate: 2015-11-09T07:06:00Z
      DOI: 10.1142/S0219749915500471
       
  • Post-measurement state and entropy in finite quantum systems
    • Authors: Hilal Al Hadhrami
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We studied in this paper the bipartite quantum systems in finite Hilbert space. We applied the measurement on the first subsystem only and studied how this measurement is affecting the entropy of the second subsystem. The analytic work carried out in this paper shows that the post measurement state is factorizable when measurement is applied on the first subsystem. This result shows that the disorder of the system is reduced and hence the entropy of the whole system is reduced as expected. However, it is also shown in this work that the entropy of the second subsystem of the post-measurement state could be greater than that of the original state. Increasing entropy after measurement means that the disorder in the second subsystem is increased. The information we gain from measuring the first subsystem reduces our information about the second subsystem rather than increasing it or at least keeping it the same as expected. This means that more factors may be required in order to calculate the probability of finding the second subsystem in a certain state.
      Citation: International Journal of Quantum Information
      PubDate: 2015-10-23T01:55:12Z
      DOI: 10.1142/S0219749915500434
       
  • Information entropy of multi-qubit rabi system
    • Authors: D. A. M. Abo-Kahla, M. Abdel-Aty
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We consider quantum information entropy phenomenon for multi-qubit Rabi system. By introducing different measurements schemes, we establish the relation between information entropy approach and Von Neumann entropy. It is shown that the information entropy is more sensitive to the time development than the Von Neumann entropy. Furthermore, the suggested protocol exhibits excellent scaling of relevant characteristics, with respect to population dynamics, such that more accurate dynamical results may be obtained using information entropy due to variation of the frequency detuning and the coupling constant.
      Citation: International Journal of Quantum Information
      PubDate: 2015-09-18T10:17:04Z
      DOI: 10.1142/S0219749915500422
       
  • Quantum state space dimension as a quantum resource
    • Authors: A. Plastino, G. Bellomo, A. R. Plastino
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We argue that the dimensionality of the space of quantum systems' states should be considered as a legitimate resource for quantum information tasks. The assertion is supported by the fact that quantum states with discord-like capacities can be obtained from classically-correlated states in spaces of dimension large enough. We illustrate things with some simple examples that justify our claim.
      Citation: International Journal of Quantum Information
      PubDate: 2015-09-18T10:16:55Z
      DOI: 10.1142/S0219749915500392
       
  • Entanglement versus Gaussian quantum discord in a double-cavity
           opto-mechanical system
    • Authors: J. El Qars, M. Daoud, Ahl Laamara
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In this paper, we investigate the robustness of the quantum correlations against the environment effects in various opto-mechanical bipartite systems. For two spatially separated opto-mechanical cavities, we give analytical formula for the global covariance matrix involving two mechanical modes and two optical modes. The logarithmic negativity as an indicator of the degree of entanglement and the Gaussian quantum discord which is a witness of quantumness of correlations are used as quantifiers to evaluate the different pairwise quantum correlations in the whole system. The evolution of the quantum correlations existing in this opto-mechanical system are analyzed in terms of the thermal bath temperature, squeezing parameter and the opto-mechanical cooperativity. We find that with desirable choice of these parameters, it is possible either to enhance or annihilate the quantum correlations in the system. Various scenarios are discussed in detail.
      Citation: International Journal of Quantum Information
      PubDate: 2015-09-18T10:16:54Z
      DOI: 10.1142/S0219749915500410
       
  • Continuous quantum measurement in spin environments
    • Authors: Dong Xie, An Min Wang
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We derive a stochastic master equation (SME) which describes the decoherence dynamics of a system in spin environments conditioned on the measurement record. Markovian and non-Markovian nature of environment can be revealed by a spectroscopy method based on weak continuous quantum measurement. On account of that correlated environments can lead to a non-local open system which exhibits strong non-Markovian effects although the local dynamics are Markovian, the spectroscopy method can be used to demonstrate that there is correlation between two environments.
      Citation: International Journal of Quantum Information
      PubDate: 2015-09-01T08:33:41Z
      DOI: 10.1142/S0219749915500409
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2015