Title:	Self-testing quantum states via nonmaximal violation in Hardy’s test of nonlocality
Authors:	Rai, Ashutosh Pivoluska, Matej Sasmal, Souradeep Banik, Manik Ghosh, Sibashish Plesch, Martin
Issue Date:	27-May-2022
Publisher:	Physical Review A
Citation:	Physical Review A, 2022, Vol.105 (5), Article No.052227
Abstract:	Self-testing protocols enable the certification of quantum devices without demanding full knowledge about their inner workings. A typical approach in designing such protocols is based on observing nonlocal correlations which exhibit maximum violation in a Bell test. We show that in the Bell experiment known as Hardy’s test of nonlocality, not only does the maximally nonlocal correlation self-test a quantum state, rather a nonmaximal nonlocal behavior can serve the same purpose. We, in fact, completely characterize all such behaviors leading to a self-test of every pure two-qubit entangled state except for the maximally entangled ones. Apart from presenting an alternative self-testing protocol, our method provides a powerful tool towards characterizing the complex boundary of the set of quantum correlations.
Description:	Restricted Access
URI:	http://hdl.handle.net/2289/7961
ISSN:	1050-2947 1094-1622 (Online)
Alternative Location:	https://arxiv.org/abs/2112.06595 https://ui.adsabs.harvard.edu/abs/2022PhRvA.105e2227R/abstract https://doi.org/10.1103/PhysRevA.105.052227
Copyright:	2022 American Physical Society
Appears in Collections:	Research Papers (LAMP)

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