Sufficient criterion for guaranteeing that a two-qubit state is unsteerable

Joseph Bowles, Flavien Hirsch, Marco Túlio Quintino, and Nicolas Brunner
Phys. Rev. A 93, 022121 – Published 26 February 2016

Abstract

Quantum steering can be detected via the violation of steering inequalities, which provide sufficient conditions for the steerability of quantum states. Here we discuss the converse problem, namely, ensuring that an entangled state is unsteerable and hence Bell local. We present a simple criterion, applicable to any two-qubit state, that guarantees that the state admits a local hidden state model for arbitrary projective measurements. Specifically, we construct local hidden state models for a large class of entangled states, which thus cannot violate any steering or Bell inequality. In turn, this leads to sufficient conditions for a state to be only one-way steerable and provides the simplest possible example of one-way steering. Finally, by exploiting the connection between steering and measurement incompatibility, we give a sufficient criterion for a continuous set of qubit measurements to be jointly measurable.

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  • Received 26 October 2015

DOI:https://doi.org/10.1103/PhysRevA.93.022121

©2016 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & Technology

Authors & Affiliations

Joseph Bowles, Flavien Hirsch, Marco Túlio Quintino, and Nicolas Brunner

  • Département de Physique Théorique, Université de Genève, 1211 Genève, Switzerland

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Issue

Vol. 93, Iss. 2 — February 2016

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