Quantum Correlations in Nonlocal Boson Sampling

Farid Shahandeh, Austin P. Lund, and Timothy C. Ralph
Phys. Rev. Lett. 119, 120502 – Published 19 September 2017
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Abstract

Determination of the quantum nature of correlations between two spatially separated systems plays a crucial role in quantum information science. Of particular interest is the questions of if and how these correlations enable quantum information protocols to be more powerful. Here, we report on a distributed quantum computation protocol in which the input and output quantum states are considered to be classically correlated in quantum informatics. Nevertheless, we show that the correlations between the outcomes of the measurements on the output state cannot be efficiently simulated using classical algorithms. Crucially, at the same time, local measurement outcomes can be efficiently simulated on classical computers. We show that the only known classicality criterion violated by the input and output states in our protocol is the one used in quantum optics, namely, phase-space nonclassicality. As a result, we argue that the global phase-space nonclassicality inherent within the output state of our protocol represents true quantum correlations.

  • Figure
  • Received 7 February 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.120502

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalQuantum Information, Science & TechnologyGeneral Physics

Authors & Affiliations

Farid Shahandeh*, Austin P. Lund, and Timothy C. Ralph

  • Centre for Quantum Computation and Communication Technology, School of Mathematics and Physics, University of Queensland, St Lucia, Queensland 4072, Australia

  • *f.shahandeh@uq.edu.au

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Issue

Vol. 119, Iss. 12 — 22 September 2017

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