We introduce a protocol addressing the conformance test problem, which consists in determining whether a process under test conforms to a reference one. We consider a process to be characterized by the set of end products it produces, which is generated according to a given probability distribution. We formulate the problem in the context of hypothesis testing and consider the specific case in which the objects can be modeled as pure loss channels. We demonstrate theoretically that a simple quantum strategy, using readily available resources and measurement schemes in the form of two-mode squeezed vacuum and photon counting, can outperform any classical strategy. We experimentally implement this protocol, exploiting optical twin beams, validating our theoretical results, and demonstrating that, in this task, there is a quantum advantage in a realistic setting.

Quantum conformance test / Ortolano, G; Boucher, P; Degiovanni, Ip; Losero, E; Genovese, M; Ruo Berchera, I. - In: SCIENCE ADVANCES. - ISSN 2375-2548. - 7:52(2021), p. eabm3093. [10.1126/sciadv.abm3093]

Quantum conformance test

Ortolano, G;Boucher, P
;
Degiovanni, IP;Losero, E;Genovese, M;Ruo Berchera, I
2021

Abstract

We introduce a protocol addressing the conformance test problem, which consists in determining whether a process under test conforms to a reference one. We consider a process to be characterized by the set of end products it produces, which is generated according to a given probability distribution. We formulate the problem in the context of hypothesis testing and consider the specific case in which the objects can be modeled as pure loss channels. We demonstrate theoretically that a simple quantum strategy, using readily available resources and measurement schemes in the form of two-mode squeezed vacuum and photon counting, can outperform any classical strategy. We experimentally implement this protocol, exploiting optical twin beams, validating our theoretical results, and demonstrating that, in this task, there is a quantum advantage in a realistic setting.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11696/72912
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