for Journals by Title or ISSN
for Articles by Keywords
help
  Subjects -> PHYSICS (Total: 796 journals)
    - ELECTRICITY AND MAGNETISM (9 journals)
    - MECHANICS (20 journals)
    - NUCLEAR PHYSICS (48 journals)
    - OPTICS (85 journals)
    - PHYSICS (580 journals)
    - SOUND (23 journals)
    - THERMODYNAMICS (31 journals)

PHYSICS (580 journals)            First | 1 2 3 | Last

Showing 401 - 600 of 741 Journals sorted alphabetically
Nature Communications     Open Access   (Followers: 104)
Nature Materials     Full-text available via subscription   (Followers: 56)
Nature Physics     Full-text available via subscription   (Followers: 35)
NDT & E International     Hybrid Journal   (Followers: 46)
Neutron News     Hybrid Journal  
New Journal of Physics     Open Access   (Followers: 4)
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: 13)
Nonlinear Dynamics     Hybrid Journal   (Followers: 5)
Novel Superconducting Materials     Open Access  
npj Computational Materials     Open Access  
npj Microgravity     Open Access  
npj Quantum Information     Open Access  
NTM Zeitschrift für Geschichte der Wissenschaften, Technik und Medizin     Hybrid Journal   (Followers: 3)
Nuclear Engineering and Design     Hybrid Journal   (Followers: 10)
Nuclear Medicine and Biology     Hybrid Journal   (Followers: 3)
Open Journal of Biophysics     Open Access   (Followers: 1)
Open Journal of Fluid Dynamics     Open Access   (Followers: 11)
Open Journal of Microphysics     Open Access  
Open Physics     Open Access   (Followers: 3)
Optical Communications and Networking, IEEE/OSA Journal of     Full-text available via subscription   (Followers: 12)
Optofluidics, Microfluidics and Nanofluidics     Open Access   (Followers: 1)
Organic Electronics     Hybrid Journal   (Followers: 4)
Organic Photonics and Photovoltaics     Open Access   (Followers: 1)
PAJ: A Journal of Performance and Art     Hybrid Journal   (Followers: 12)
Papers in Physics     Open Access   (Followers: 1)
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   (Followers: 1)
Philosophical Magazine     Hybrid Journal   (Followers: 2)
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences     Full-text available via subscription   (Followers: 7)
Philosophy and Foundations of Physics     Full-text available via subscription  
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: 3)
Physical Review X     Open Access   (Followers: 7)
Physical Sciences Data     Full-text available via subscription   (Followers: 1)
Physical Sciences Reviews     Full-text available via subscription  
Physics - spotlighting exceptional research     Full-text available via subscription   (Followers: 1)
Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B     Full-text available via subscription   (Followers: 3)
Physics and Chemistry of Liquids: An International Journal     Hybrid Journal   (Followers: 1)
Physics and Chemistry of the Earth, Parts A/B/C     Hybrid Journal   (Followers: 5)
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: 11)
Physics in Perspective     Hybrid Journal   (Followers: 1)
Physics International     Open Access   (Followers: 3)
Physics Letters A     Hybrid Journal   (Followers: 11)
Physics Letters B     Open Access   (Followers: 4)
Physics of Fluids     Hybrid Journal   (Followers: 31)
Physics of Life Reviews     Hybrid Journal   (Followers: 1)
Physics of Plasmas     Hybrid Journal   (Followers: 7)
Physics of the Dark Universe     Open Access   (Followers: 2)
Physics of the Solid State     Hybrid Journal   (Followers: 2)
Physics of Wave Phenomena     Hybrid Journal   (Followers: 1)
Physics Procedia     Open Access   (Followers: 1)
Physics Reports     Full-text available via subscription   (Followers: 1)
Physics Research International     Open Access   (Followers: 2)
Physics Today     Hybrid Journal   (Followers: 67)
Physics World     Full-text available via subscription   (Followers: 7)
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: 14)
Preview     Hybrid Journal  
Proceedings of the National Academy of Sciences     Full-text available via subscription   (Followers: 586)
Proceedings of the National Academy of Sciences, India Section A     Hybrid Journal   (Followers: 3)
Progress in Materials Science     Hybrid Journal   (Followers: 23)
Progress in Planning     Hybrid Journal  
Progress of Theoretical and Experimental Physics     Open Access  
Quantum Electronics     Full-text available via subscription   (Followers: 3)
Quantum Measurements and Quantum Metrology     Open Access  
Quantum Studies : Mathematics and Foundations     Hybrid Journal   (Followers: 2)
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: 34)
Radiological Physics and Technology     Hybrid Journal  
Reflets de la physique     Full-text available via subscription  
Reports on Mathematical Physics     Full-text available via subscription  
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  
Results in Physics     Open Access   (Followers: 1)
Reviews in Mathematical Physics     Hybrid Journal  
Reviews in Physics     Open Access  
Reviews of Accelerator Science and Technology     Hybrid Journal  
Reviews of Geophysics     Full-text available via subscription   (Followers: 32)
Reviews of Modern Physics     Full-text available via subscription   (Followers: 18)
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: 3)
Russian Physics Journal     Hybrid Journal  
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     Full-text available via subscription   (Followers: 4)
Science China Physics, Mechanics & Astronomy     Hybrid Journal   (Followers: 2)
Scientific Reports     Open Access   (Followers: 30)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 42)
Sensor Letters     Full-text available via subscription   (Followers: 1)
Sensors and Actuators A: Physical     Hybrid Journal   (Followers: 111)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 4)
Shock and Vibration     Hybrid Journal   (Followers: 8)
Shock Waves     Hybrid Journal   (Followers: 6)
Small     Hybrid Journal   (Followers: 10)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 52)
Solid State Physics     Full-text available via subscription  
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 9)
Space Research Journal     Open Access   (Followers: 4)
Space Weather     Full-text available via subscription   (Followers: 9)
Spectral Analysis Review     Open Access  
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy     Hybrid Journal   (Followers: 7)
Spectrochimica Acta Part B: Atomic Spectroscopy     Hybrid Journal   (Followers: 7)
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: 9)
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: 18)
The Physics Teacher     Full-text available via subscription   (Followers: 94)
Theoretical and Computational Fluid Dynamics     Hybrid Journal   (Followers: 12)
Theoretical and Mathematical Physics     Hybrid Journal   (Followers: 4)
Topological Quantum Matter     Open Access  
Transport Phenomena in Nano and Micro Scales     Open Access  
Transport Theory and Statistical Physics     Hybrid Journal   (Followers: 4)
Tribology International     Hybrid Journal   (Followers: 41)
Tribology Letters     Hybrid Journal   (Followers: 5)
Tribotest     Hybrid Journal  
Turkish Journal of Physics     Open Access  
Ultrasonics     Hybrid Journal   (Followers: 5)
Ultrasonics Sonochemistry     Hybrid Journal   (Followers: 3)
Ultrasound in Medicine & Biology     Full-text available via subscription   (Followers: 8)
Universal Journal of Physics and Application     Open Access   (Followers: 1)
Unnes Physics Education Journal     Open Access   (Followers: 2)
Unnes Physics Journal     Open Access  
Waves, Wavelets and Fractals     Open Access  
Western Journal of Communication     Hybrid Journal   (Followers: 5)
Women & Performance: a journal of feminist theory     Hybrid Journal   (Followers: 5)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 10)
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]
  • Noise effects on conflicting interest quantum games with incomplete
           information
    • Authors: Haozhen Situ, Zhiming Huang, Cai Zhang
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Noise effects can be harmful to quantum information systems. In the present paper, we study noise effects in the context of quantum games with incomplete information, which have more complicated structure than quantum games with complete information. The effects of several paradigmatic noises on three newly proposed conflicting interest quantum games with incomplete information are studied using numerical optimization method. Intuitively noises will bring down the payoffs. However, we find that in some situations the outcome of the games under the influence of noise effects are counter-intuitive. Sometimes stronger noise may lead to higher payoffs. Some properties of the game, like quantum advantage, fairness and equilibrium, are invulnerable to some kinds of noises.
      Citation: International Journal of Quantum Information
      PubDate: 2016-09-21T07:49:12Z
      DOI: 10.1142/S0219749916500337
       
  • Relations between entanglement and purity in non-Markovian dynamics
    • Abstract: International Journal of Quantum Information, Ahead of Print.
      Knowledge of the relationships among different features of quantumness, like entanglement and state purity, is important from both fundamental and practical viewpoints. Yet, this issue remains little explored in dynamical contexts for open quantum systems. We address this problem by studying the dynamics of entanglement and purity for two-qubit systems using paradigmatic models of radiation-matter interaction, with a qubit being isolated from the environment (spectator configuration). We show the effects of the corresponding local quantum channels on an initial two-qubit pure entangled state in the concurrence–purity diagram and find the conditions which enable dynamical closed formulas of concurrence, used to quantify entanglement, as a function of purity. We finally discuss the usefulness of these relations in assessing entanglement and purity thresholds which allow noisy quantum teleportation. Our results provide new insights about how different properties of composite open quantum systems behave and relate each other during quantum evolutions.
      Citation: International Journal of Quantum Information
      PubDate: 2016-09-19T07:36:41Z
      DOI: 10.1142/S0219749916500313
       
  • Optimization of quantum Hamiltonian evolution: from two projection
           operators to local Hamiltonians
    • Authors: Apoorva Patel, Anjani Priyadarsini
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Given a quantum Hamiltonian and its evolution time, the corresponding unitary evolution operator can be constructed in many different ways, corresponding to different trajectories between the desired end-points and different series expansions. A choice among these possibilities can then be made to obtain the best computational complexity and control over errors. It is shown how a construction based on Grover’s algorithm scales linearly in time and logarithmically in the error bound, and is exponentially superior in error complexity to the scheme based on the straightforward application of the Lie–Trotter formula. The strategy is then extended first to simulation of any Hamiltonian that is a linear combination of two projection operators, and then to any local efficiently computable Hamiltonian. The key feature is to construct an evolution in terms of the largest possible steps instead of taking small time steps. Reflection operations and Chebyshev expansions are used to efficiently control the total error on the overall evolution, without worrying about discretization errors for individual steps. We also use a digital implementation of quantum states that makes linear algebra operations rather simple to perform.
      Citation: International Journal of Quantum Information
      PubDate: 2016-09-14T01:52:34Z
      DOI: 10.1142/S0219749916500271
       
  • Quantum backflow effect and nonclassicality
    • Authors: Francesco Albarelli, Tommaso Guaita, Matteo G. A. Paris
      Abstract: International Journal of Quantum Information, Ahead of Print.
      The quantum backflow effect is a counterintuitive behavior of the probability current of a free particle, which may be negative even for states with vanishing negative momentum component. Here, we address the notion of nonclassicality arising from the backflow effect, i.e. from the negativity of the probability current, and analyze its relationships with the notion of nonclassicality based on the negativity of the Wigner function. Our results show that backflow is linked to a different, and in fact more restrictive, notion of nonclassicality, the negativity of the Wigner function being only a necessary prerequisite for its occurrence. This hierarchical structure may be confirmed by looking at the addition of thermal noise, which more easily destroys the negativity of the probability current than the negativity of the Wigner function itself.
      Citation: International Journal of Quantum Information
      PubDate: 2016-09-14T01:52:10Z
      DOI: 10.1142/S0219749916500325
       
  • Aspects of complementarity and uncertainty
    • Authors: Radhika Vathsan, Tabish Qureshi
      Abstract: International Journal of Quantum Information, Ahead of Print.
      The two-slit experiment with quantum particles provides many insights into the behavior of quantum mechanics, including Bohr’s complementarity principle. Here, we analyze Einstein’s recoiling slit version of the experiment and show how the inevitable entanglement between the particle and the recoiling slit as a which-way detector is responsible for complementarity. We derive the Englert–Greenberger–Yasin duality from this entanglement, which can also be thought of as a consequence of sum-uncertainty relations between certain complementary observables of the recoiling slit. Thus, entanglement is an integral part of the which-way detection process, and so is uncertainty, though in a completely different way from that envisaged by Bohr and Einstein.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-24T04:12:18Z
      DOI: 10.1142/S0219749916400311
       
  • Preface
    • Authors: Pankaj Agrawal, Arun Kumar Pati
      Abstract: International Journal of Quantum Information, Ahead of Print.

      Citation: International Journal of Quantum Information
      PubDate: 2016-08-23T08:56:29Z
      DOI: 10.1142/S0219749916020020
       
  • Quantum mechanics and quantum information science: The nature of [math]
    • Authors: Partha Ghose
      Abstract: International Journal of Quantum Information, Ahead of Print.
      An overview is given of the nature of the quantum mechanical wave function.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-22T09:56:05Z
      DOI: 10.1142/S021974991640030X
       
  • The Hardy’s nonlocality argument
    • Authors: Sujit K Choudhary, Pankaj Agrawal
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Certain predictions of quantum theory are not compatible with the notion of local-realism. This was the content of Bell’s famous theorem of the year 1964. Bell proved this with the help of an inequality, famously known as Bell’s inequality. The alternative proofs of Bell’s theorem without using Bell’s inequality are known as “nonlocality without inequality (NLWI)” proofs. We review one such proof namely the Hardy’s proof which due to its simplicity and generality has been considered the best version of Bell’s theorem.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-19T09:31:35Z
      DOI: 10.1142/S0219749916400359
       
  • Open system quantum evolution and the assumption of complete positivity (A
           Tutorial)
    • Authors: Mark Byrd, Russell Ceballos, Eric Chitambar
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Quantum systems which interact with an unknown environment cannot be described in terms of a unitary evolution on the system alone. For such evolution one can use a map from one density operator to another and use any other known information to model the system. Such maps are required to be positive (at least on their domain) — they take positive density operators to positive density operators — so as to be physically reasonable. A map [math] which is positive but not completely positive (CP) is one which takes positive operators to positive operators, but when extended by the identity [math], i.e. [math] does not give a positive map for some [math]. The map is CP if and only if the extension is positive for all [math]. Recently some effort has been put forth to try to understand if, and/or, under what circumstances one might utilize a non-CP map. Here, after a tutorial-type introduction to maps from one density operator to another, some examples which do not fit the standard prescription (SP) for deriving a CP map are given. In cases where the physical system is constrained by some knowledge of the interaction, it is possible that the SP cannot be used directly. Our example is robust to changes in the initial and final conditions.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-18T04:07:20Z
      DOI: 10.1142/S0219749916400232
       
  • The Gibbs paradox and the physical criteria for indistinguishability of
           identical particles
    • Authors: C. S. Unnikrishnan
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Gibbs paradox in the context of statistical mechanics addresses the issue of additivity of entropy of mixing gases. The usual discussion attributes the paradoxical situation to classical distinguishability of identical particles and credits quantum theory for enabling indistinguishability of identical particles to solve the problem. We argue that indistinguishability of identical particles is already a feature in classical mechanics and this is clearly brought out when the problem is treated in the language of information and associated entropy. We pinpoint the physical criteria for indistinguishability that is crucial for the treatment of the Gibbs’ problem and the consistency of its solution with conventional thermodynamics. Quantum mechanics provides a quantitative criterion, not possible in the classical picture, for the degree of indistinguishability in terms of visibility of quantum interference, or overlap of the states as pointed out by von Neumann, thereby endowing the entropy expression with mathematical continuity and physical reasonableness.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-18T04:07:19Z
      DOI: 10.1142/S0219749916400372
       
  • Several foundational and information theoretic implications of
           Bell’s theorem
    • Authors: Guruprasad Kar, Manik Banik
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In 1935, Albert Einstein and two colleagues, Boris Podolsky and Nathan Rosen (EPR) developed a thought experiment to demonstrate what they felt was a lack of completeness in quantum mechanics (QM). EPR also postulated the existence of more fundamental theory where physical reality of any system would be completely described by the variables/states of that fundamental theory. This variable is commonly called hidden variable and the theory is called hidden variable theory (HVT). In 1964, John Bell proposed an empirically verifiable criterion to test for the existence of these HVTs. He derived an inequality, which must be satisfied by any theory that fulfill the conditions of locality and reality. He also showed that QM, as it violates this inequality, is incompatible with any local-realistic theory. Later it has been shown that Bell’s inequality (BI) can be derived from different set of assumptions and it also find applications in useful information theoretic protocols. In this review, we will discuss various foundational as well as information theoretic implications of BI. We will also discuss about some restricted nonlocal feature of quantum nonlocality and elaborate the role of Uncertainty principle and Complementarity principle in explaining this feature.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-18T04:07:18Z
      DOI: 10.1142/S021974991640027X
       
  • On Measures of quantum entanglement — a brief review
    • Authors: Debasis Sarkar
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Entanglement is one of the most useful resources in quantum information processing. It is effectively the quantum correlation between different subsystems of a composite system. Mathematically, one of the most hard tasks in quantum mechanics is to quantify entanglement. However, progress in this field is remarkable but not complete yet. There are many things to do with quantification of entanglement. In this review, we will discuss some of the important measures of bipartite entanglement.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-18T04:07:17Z
      DOI: 10.1142/S0219749916400244
       
  • Understanding ghost interference
    • Authors: Tabish Qureshi, Pravabati Chingangbam, Sheeba Shafaq
      Abstract: International Journal of Quantum Information, Ahead of Print.
      The ghost interference observed for entangled photons is theoretically analyzed using wave-packet dynamics. It is shown that ghost interference is a combined effect of virtual double-slit creation due to entanglement, and quantum erasure of which-path information for the interfering photon. For the case where the two photons are of different color, it is shown that fringe width of the interfering photon depends not only on its own wavelength, but also on the wavelength of the other photon which it is entangled with.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-18T04:07:16Z
      DOI: 10.1142/S0219749916400360
       
  • Correlations, operations and the second law of thermodynamics
    • Authors: Sai Vinjanampathy, Kavan Modi
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Completely positive trace preserving (CPTP) maps are essential for the formulation of the second law of thermodynamics. The dynamics of quantum systems initially correlated with their environments are in general not described by such maps. We explore, how this issue can be fixed by describing the classical analogue of this problem. We consider initially correlated probability distributions, whose subsequent system dynamics is ill-described by stochastic maps, and prescribe the correct way to describe the dynamics. We use this prescription to discuss the classical version of the second law, valid for initially correlated probability distributions.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-15T08:31:20Z
      DOI: 10.1142/S0219749916400335
       
  • Local, nonlocal quantumness and information theoretic measures
    • Authors: Pankaj Agrawal, Sk Sazim, Indranil Chakrabarty, Arun K. Pati
      Abstract: International Journal of Quantum Information, Ahead of Print.
      It has been suggested that there may exist quantum correlations that go beyond entanglement. The existence of such correlations can be revealed by information theoretic quantities such as quantum discord, but not by the conventional measures of entanglement. We argue that a state displays quantumness, that can be of local and nonlocal origin. Information theoretic measures not only characterize the nonlocal quantumness, but also the local quantumness, such as the “local superposition”. This can be a reason, why such measures are nonzero, when there is no entanglement. We consider a generalized version of the Werner state to demonstrate the interplay of local quantumness, nonlocal quantumness and classical mixedness of a state.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-15T08:31:13Z
      DOI: 10.1142/S0219749916400347
       
  • Distinguishing quantum operations: LOCC versus separable operators
    • Authors: Indrani Chattopadhyay, Debasis Sarkar
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In this paper, we discuss the issue of distinguishing a pair of quantum operation in general. We use Krause theorem for representing the operations in unitary form. This supports the existence of pair of quantum operations that are not locally distinguishable, but distinguishable in asymptotic sense in some higher dimensional system. The process can even be successful without any use of the entangled initial state.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-15T08:31:12Z
      DOI: 10.1142/S0219749916400281
       
  • Generating arbitrary cebits on the orbital angular momentum poincaré
           sphere
    • Authors: P. Chithrabhanu, A. Aadhi, Salla Gangi Reddy, Shashi Prabhakar, R. P. Singh
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Using classical laser beams, we generate a general complex superposition state, cebit, of orbital angular momentum (OAM) of light. We use a nonseparable beam of polarization and OAM generated by a modified Sagnac interferometer for the generation of OAM cebits which can be represented as points on the OAM Poincaré sphere. The general cebit state is represented as a function of the rotation angle of the wave plates so that one can easily generate the required state.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-10T08:40:53Z
      DOI: 10.1142/S0219749916400323
       
  • Contrasting distributions of pairwise entanglement and mutual information
           in Heisenberg spin systems
    • Authors: V. Subrahmanyam
      Abstract: International Journal of Quantum Information, Ahead of Print.
      The correlations between a pair of spins in a many-spin state encoded in the diagonal and off-diagonal spin–spin correlation functions. These spin functions determine the quantum correlation measures, like pair-wise concurrence, quantum discord and other measures of quantum information. We show that for isotropic and translationally invariant states, the quantum correlations depend only on the diagonal spin correlation function. The pair concurrence shows a strict short-ranged behavior. The distribution of concurrence for a random W-like state exhibits a long tail for both time-reversal invariant states and for states that break the time reversal. The quantum discord can be related to the diagonal spin correlation function. As the spin function is long range close to a critical point, analogously the quantum discord exhibits a long range behavior. For the isotropi state, the conditional entropy distribution is a Dirac delta function, whereas it has a twin-peak structure for the anisotropic model.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-04T03:06:36Z
      DOI: 10.1142/S0219749916400293
       
  • Algebraic formulation of quantum theory, particle identity and
           entanglement
    • Authors: T. R. Govindarajan
      Abstract: International Journal of Quantum Information, Ahead of Print.
      Quantum theory as formulated in conventional framework using statevectors in Hilbert spaces misses the statistical nature of the underlying quantum physics. Formulation using operators [math] algebra and density matrices appropriately captures this feature in addition leading to the correct formulation of particle identity. In this framework, Hilbert space is an emergent concept. Problems related to anomalies and quantum epistemology are discussed.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-04T03:06:30Z
      DOI: 10.1142/S0219749916400268
       
  • Some applications of uncertainty relations in quantum information
    • Authors: A. S. Majumdar, T. Pramanik
      Abstract: International Journal of Quantum Information, Ahead of Print.
      We discuss some applications of various versions of uncertainty relations for both discrete and continuous variables in the context of quantum information theory. The Heisenberg uncertainty relation enables demonstration of the Einstein, Podolsky and Rosen (EPR) paradox. Entropic uncertainty relations (EURs) are used to reveal quantum steering for non-Gaussian continuous variable states. EURs for discrete variables are studied in the context of quantum memory where fine-graining yields the optimum lower bound of uncertainty. The fine-grained uncertainty relation is used to obtain connections between uncertainty and the nonlocality of retrieval games for bipartite and tripartite systems. The Robertson-Schrödinger (RS) uncertainty relation is applied for distinguishing pure and mixed states of discrete variables.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-04T03:06:28Z
      DOI: 10.1142/S0219749916400220
       
  • Secure quantum communication with orthogonal states
    • Authors: Chitra Shukla, Anindita Banerjee, Anirban Pathak, R. Srikanth
      Abstract: International Journal of Quantum Information, Ahead of Print.
      In majority of protocols of secure quantum communication (such as, BB84, B92, etc.), the unconditional security of the protocols are obtained by using conjugate coding (two or more mutually unbiased bases (MUBs)). Initially, all the conjugate-coding-based protocols of secure quantum communication were restricted to quantum key distribution (QKD), but later on they were extended to other cryptographic tasks (such as, secure direct quantum communication and quantum key agreement). In contrast to the conjugate-coding-based protocols, a few completely orthogonal-state-based protocols of unconditionally secure QKD (such as, Goldenberg–Vaidman and N09) were also proposed. However, till the recent past, orthogonal-state-based protocols were only a theoretical concept and were limited to QKD. Only recently, orthogonal-state-based protocols of QKD are experimentally realized and extended to cryptographic tasks beyond QKD. This paper aims to briefly review the orthogonal-state-based protocols of secure quantum communication that are recently introduced by our group and other researchers.
      Citation: International Journal of Quantum Information
      PubDate: 2016-08-04T03:06:23Z
      DOI: 10.1142/S0219749916400219
       
 
 
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
 
Home (Search)
Subjects A-Z
Publishers A-Z
Customise
APIs
Your IP address: 54.235.46.164
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2016