Quantum vs Noncontextual Semi-Device-Independent Randomness Certification

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We compare the power of quantum and classical physics in terms of randomness certification from devices which are only partially characterized. We study randomness certification based on state discrimination and take noncontextuality as the notion of classicality. A contextual advantage was recently shown to exist for state discrimination. Here, we develop quantum and noncontextual semi-device independent protocols for random-number generation based on maximum-confidence discrimination, which generalizes unambiguous and minimum-error state discrimination. We show that, for quantum eavesdroppers, quantum devices can certify more randomness than noncontextual ones whenever none of the input states are unambiguously identified. That is, a quantum-over-classical advantage exists.
Publisher
AMER PHYSICAL SOC
Issue Date
2022-07
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.129, no.5

ISSN
0031-9007
DOI
10.1103/physrevlett.129.050501
URI
http://hdl.handle.net/10203/298756
Appears in Collection
EE-Journal Papers(저널논문)
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