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Activating strong nonlocality from local sets: An elimination paradigm

Subhendu B. Ghosh1, Tathagata Gupta1, Ardra A. V.2, Anandamay Das Bhowmik1, Sutapa Saha1, Tamal Guha3, and Amit Mukherjee4

  • 1Physics and Applied Mathematics Unit, Indian Statistical Institute, Kolkata, 203 B. T. Road, Kolkata 700108, India
  • 2School of Physics, IISER Thiruvananthapuram, Vithura, Kerala 695551, India
  • 3Department of Computer Science, The University of Hong Kong, Pokfulam Road, Hong Kong
  • 4Centre for Astroparticle Physics and Space Science (CAPSS), Bose Institute, Block EN, Sector V, Salt Lake, Kolkata 700091, India

Phys. Rev. A 106, L010202 – Published 25 July, 2022

DOI: https://doi.org/10.1103/PhysRevA.106.L010202

Abstract

Apart from the Bell nonlocality, which deals with the correlations generated from the local input-output statistics, quantum theory exhibits another kind of nonlocality that involves the indistinguishability of the locally preparable set of multipartite states. While Bell-type nonlocality cannot be activated from a given local correlation via local operations and shared randomness, it is already reported that the latter kind of nonlocality can be activated from a “local,” i.e., locally distinguishable set of states. However, recently it is shown that a stronger notion of such a nonlocality, which deals with elimination instead of discrimination, can be activated from locally preparable bipartite states of dimension 7×8. The present work observes that the same notion can be demonstrated even in lower dimensional multipartite systems. Importantly, the possibly strongest version of such an activation is further depicted here, where none of the transformed product states can be eliminated, even if all but one of the parties come together.

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