Bipartite Postquantum Steering in Generalized Scenarios

Ana Belén Sainz, Matty J. Hoban, Paul Skrzypczyk, and Leandro Aolita
Phys. Rev. Lett. 125, 050404 – Published 29 July 2020
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Abstract

The study of stronger-than-quantum effects is a fruitful line of research that provides valuable insight into quantum theory. Unfortunately, traditional bipartite steering scenarios can always be explained by quantum theory. Here, we show that, by relaxing this traditional setup, bipartite steering incompatible with quantum theory is possible. The two scenarios we describe, which still feature Alice remotely steering Bob’s system, are (i) one where Bob also has an input and operates on his subsystem, and (ii) the “instrumental steering” scenario. We show that such bipartite postquantum steering is a genuinely new type of postquantum nonlocality, which does not follow from postquantum Bell nonlocality. In addition, we present a method to bound quantum violations of steering inequalities in these scenarios.

  • Figure
  • Received 24 July 2019
  • Revised 18 February 2020
  • Accepted 29 June 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.050404

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Ana Belén Sainz1,2, Matty J. Hoban3, Paul Skrzypczyk4, and Leandro Aolita5

  • 1International Centre for Theory of Quantum Technologies, University of Gdańsk, 80-308 Gdańsk, Poland
  • 2Perimeter Institute for Theoretical Physics, 31 Caroline Street North, Waterloo, Ontario, Canada N2L 2Y5
  • 3Department of Computing, Goldsmiths, University of London, London SE14 6NW, United Kingdom
  • 4H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
  • 5Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, 21941-972 Rio de Janeiro, RJ, Brazil

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Issue

Vol. 125, Iss. 5 — 31 July 2020

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