Self-testing quantum states via nonmaximal violation in Hardy's test of nonlocality

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RAI Ashutosh PIVOLUSKA Matej SASMAL Souradeep BANIK Manik GHOSH Sibasish PLESCH Martin

Rok publikování 2022
Druh Článek v odborném periodiku
Časopis / Zdroj Phisical Review A
Fakulta / Pracoviště MU

Ústav výpočetní techniky

Citace
www https://journals.aps.org/pra/abstract/10.1103/PhysRevA.105.052227
Doi http://dx.doi.org/10.1103/PhysRevA.105.052227
Klíčová slova non-locality; entanglement; Hardy non-locality; self-testing; device-independence
Popis 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.
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