Related papers: Device-Independent Certification of Genuinely Entangled Subspaces

Device-Independent Certification of Genuinely Entangled Subspaces

URL: http://arxiv.org/abs/2003.02285v2
Date: Thu, 31 Dec 2020 12:43:45 GMT
Title: Device-Independent Certification of Genuinely Entangled Subspaces
Authors: Flavio Baccari, Remigiusz Augusiak, Ivan \v{S}upi\'c, Antonio Ac\'in
Abstract summary: We introduce the concept of self-testing more general entanglement structures. We show that all quantum states maximally violating a suitably chosen Bell inequality must belong to the corresponding code subspace.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Self-testing is a procedure for characterizing quantum resources with the minimal level of trust. Up to now it has been used as a device-independent certification tool for particular quantum measurements, channels, and pure entangled states. In this work we introduce the concept of self-testing more general entanglement structures. More precisely, we present the first self-tests of an entangled subspace - the five-qubit code and the toric code. We show that all quantum states maximally violating a suitably chosen Bell inequality must belong to the corresponding code subspace, which remarkably includes also mixed states.

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