Search results for: BOUND ON INEQUALITIES - Bridge of Knowledge

Search

Search results for: BOUND ON INEQUALITIES

Best results in : Research Potential Pokaż wszystkie wyniki (9)

Search results for: BOUND ON INEQUALITIES

Other results Pokaż wszystkie wyniki (11)

Search results for: BOUND ON INEQUALITIES

  • Bound on Bell inequalities by fraction of determinism and reverse triangle inequality

    Publication
    • P. Joshi
    • K. Horodecki
    • M. Horodecki
    • P. Horodecki
    • R. Horodecki
    • B. Li
    • S. Szarek
    • T. Szarek

    - PHYSICAL REVIEW A - Year 2015

    It is an established fact that entanglement is a resource. Sharing an entangled state leads to nonlocal correlations and to violations of Bell inequalities. Such nonlocal correlations illustrate the advantage of quantum resources over classical resources. In this paper, we quantitatively study Bell inequalities with 2 × n inputs. As found in Gisin et al. [Int. J. Quantum. Inform. 05, 525 (2007)], quantum mechanical correlations...

    Full text available to download

  • Bound entanglement maximally violating Bell inequalities: quantum entanglement is not fully equivalent to cryptographic security

    Publication

    W pracy pokazano, że czterokubitowy stan o splątaniu związanym może maksymalnie łamać prostą nierówność Bella podobną do standardowej nierówności CHSH. Prostota rozważanego układu oraz odporność splątania sprawiają, że łamanie to jest obiecujące dla współczesnej technologii eksperymentalnej. Z drugiej strony, splątanie tego stanu nie pozwala na destylację bezpiecznego klucza kryptograficznego, zatem ani splątanie, ani maksymalne...

    Full text available to download

  • Intrinsic asymmetry with respect to adversary: a new feature of Bell inequalities

    Publication

    - Journal of Physics A-Mathematical and Theoretical - Year 2014

    It is known that the local bound of a Bell inequality is sensitive to the knowledge of the external observer about the settings statistics. Here we ask how that sensitivity depends on the structure of that knowledge. It turns out that in some cases it may happen that the local bound is much more sensitive to the adversaryʼs knowledge about the settings of one party than the other. Remarkably, there are Bell inequalities which are...

    Full text to download in external service

  • Quantum metrology: Heisenberg limit with bound entanglement

    Publication

    - PHYSICAL REVIEW A - Year 2015

    Quantum entanglement may provide a huge boost in the precision of parameter estimation. However, quantum metrology seems to be extremely sensitive to noise in the probe state. There is an important still open question: What type of entanglement is useful as a resource in quantum metrology? Here we raise this question in relation to entanglement distillation. We provide a counterintuitive example of a family of bound entangled states...

    Full text available to download

  • Linear game non-contextuality and Bell inequalities—a graph-theoretic approach

    Publication

    - NEW JOURNAL OF PHYSICS - Year 2016

    We study the classical and quantum values of a class of one-and two-party unique games, that generalizes the well-known XOR games to the case of non-binary outcomes. In the bipartite case the generalized XOR(XOR-d) games we study are a subclass of the well-known linear games. We introduce a 'constraint graph' associated to such a game, with the constraints defining the game represented by an edge-coloring of the graph. We use the...

    Full text available to download