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Wyniki wyszukiwania dla: QUANTUM

Wyniki wyszukiwania dla: QUANTUM

  • Dynamical description of quantum computing: generic nonlocality of quantumnoise

    Publikacja

    We develop a dynamical non-Markovian description of quantum computing in the weak-coupling limit, in the lowest-order approximation. We show that the long-range memory of the quantum reservoir (such as the 1/t4 one exhibited by electromagnetic vacuum) produces a strong interrelation between the structure of noise and the quantum algorithm, implying nonlocal attacks of noise. This shows that the implicit assumption of quantum error...

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  • Quantum Matter

    Czasopisma

    ISSN: 2164-7615

  • Quantum Topology

    Czasopisma

    ISSN: 1663-487X , eISSN: 1664-073X

  • QUANTUM ELECTRONICS

    Czasopisma

    ISSN: 1063-7818 , eISSN: 1468-4799

  • PRX Quantum

    Czasopisma

    eISSN: 2691-3399

  • Quantum Reports

    Czasopisma

    eISSN: 2624-960X

  • Blurred quantum Darwinism across quantum reference frames

    Publikacja

    Quantum Darwinism describes objectivity of quantum systems via their correlations with their environment--information that hypothetical observers can recover by measuring the environments. However, observations are done with respect to a frame of reference. Here, we take the formalism of [Giacomini, Castro-Ruiz, & Brukner. Nat Commun 10, 494 (2019)], and consider the repercussions on objectivity when changing quantum reference...

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  • Anomalous decay of quantum correlations of quantum-dot qubits

    Publikacja

    - PHYSICAL REVIEW A - Rok 2013

    We study the evolution of quantum correlations, quantified by the geometric discord, of two excitonic quantum-dot qubits under the influence of the phonon environment. We show that the decay of these correlations differs substantially from the decay of entanglement. Instead of displaying sudden-death-type behavior, the geometric discord shows a tendency to undergo transitions between different types of decay, is sensitive to nonlocal...

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  • Quantum entanglement

    Publikacja

    - REVIEWS OF MODERN PHYSICS - Rok 2009

    All our former experience with application of quantum theory seems to say that what is predicted by quantum formalism must occur in the laboratory. But the essence of quantum formalism-entanglement, recognized by Einstein, Podolsky, Rosen, and Schrödinger-waited over 70 years to enter laboratories as a new resource as real as energy. This holistic property of compound quantum systems, which involves nonclassical correlations between...

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  • Cartoon computation: Quantum-like algorithms without quantum mechanics

    Zaproponowano formalizm prowadzący do algorytmów analogicznych do kwantowych, lecz wykorzystujący jedynie struktury geometryczne. Jako przykład sformułowano odpowiednik kwantowego algorytmu Deutscha-Jozsy.

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  • Purely quantum superadditivity of classical capacities of quantum multiple access channels

    Publikacja

    We are studying classical capacities of quantum memoryless multiaccess channels in geometric terms and we are revealing a break of additivity of the Holevo-like capacity. This effect is a purely quantum mechanical one, since, as we point out, the capacity regions of all classical memoryless multiaccess channels are additive. It is the first such effect revealed in the field of classical information transmission via quantum channels.

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  • On mixed states entanglement and quantum communication: aspects of quantum channels theory

    Publikacja

    Dokonano przeglądu związków miedzy stanami kwantowymi oraz kwantowymi kanałami. Wykazano, że istnienie nietypowych korelacji kwantowych (splątanie związane typu NPT) w pewnych sytuacjach pociąga za sobą nieaddytywność pojemności kanałów kwantowych.

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  • Are quantum correlations symmetric?

    Publikacja

    - QUANTUM INFORMATION & COMPUTATION - Rok 2010

    We provide operational definition of symmetry of entanglement: An entangled state contains symmetric entanglement if its subsystems can be exchanged (swapped) by means of local operations and classical communication. We show that in general states have asymmetric entanglement. This allows to construct nonsymmetric measure of entanglement, and a parameter that reports asymmetry of entanglement contents of quantum state. We propose...

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  • Quantum Coherence as a Resource

    Publikacja
    • A. Streltsov
    • G. Adesso
    • M. B. Plenio

    - REVIEWS OF MODERN PHYSICS - Rok 2017

    The coherent superposition of states, in combination with the quantization of observables, represents one of the most fundamental features that mark the departure of quantum mechanics from the classical realm. Quantum coherence in many-body systems embodies the essence of entanglement and is an essential ingredient for a plethora of physical phenomena in quantum optics, quantum information, solid state physics, and nanoscale thermodynamics....

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  • Quantum entanglement in time

    Publikacja

    In this paper we present a concept of quantum entanglement in time in a context of entangled consistent histories. These considerations are supported by presentation of necessary tools closely related to those acting on a space of spatial multipartite quantum states. We show that in similarity to monogamy of quantum entanglement in space, quantum entanglement in time is also endowed with this property for a particular history....

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  • Quantum origins of objectivity

    Publikacja

    - PHYSICAL REVIEW A - Rok 2015

    In spite of all of its successes, quantum mechanics leaves us with a central problem: How does nature create a bridge from fragile quanta to the objective world of everyday experience? Here we find that a basic structure within quantum mechanics that leads to the perceived objectivity is a so-called spectrum broadcast structure. We uncover this based on minimal assumptions, without referring to any dynamical details or a concrete...

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  • Quantum privacy witness

    Publikacja

    - PHYSICAL REVIEW A - Rok 2012

    While it is usually known that the mean value of a single observable is enough to detect entanglement or its distillability, the counterpart of such an approach in the case of quantum privacy has been missing. Here we develop the concept of a privacy witness, i.e., a single observable that may detect the presence of the secure key even in the case of bound entanglement. Then we develop the notion of secret-key estimation based...

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  • Dynamics of quantum entanglement

    Publikacja

    - PHYSICAL REVIEW A - Rok 2002

    A model of discrete dynamics of entanglement of a bipartite quantum state is considered. It involves a global unitary dynamics of the system and periodic actions of local bistochastic or decaying channel. For initially pure states the decay of entanglement is accompanied by an increase of von Neumann entropy of the system. We observe and discuss revivals of entanglement due to unitary interaction of subsystems. For some mixed states...

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  • Correlated electrons and transport in a quantum point contact and in a double-quantum-dot system

    Publikacja
    • B. Bułka
    • T. Kostyrko
    • M. Ţolea
    • I. Dinu

    - JOURNAL OF PHYSICS-CONDENSED MATTER - Rok 2007

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  • Advances in Quantum Chemistry

    Czasopisma

    ISSN: 0065-3276