Linear optics and photodetection achieve near-optimal unambiguous coherent state discrimination
Sidhu, Jasminder S. and Bullock, Michael S. and Guha, Saikat and Lupo, Cosmo (2023) Linear optics and photodetection achieve near-optimal unambiguous coherent state discrimination. Quantum, 7. 1025. ISSN 2521-327X (https://doi.org/10.22331/q-2023-05-31-1025)
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Abstract
Coherent states of the quantum electromagnetic field, the quantum description of ideal laser light, are prime candidates as information carriers for optical communications. A large body of literature exists on their quantum limited estimation and discrimination. However, very little is known about the practical realizations of receivers for unambiguous state discrimination (USD) of coherent states. Here we fill this gap and outline a theory of USD with receivers that are allowed to employ: passive multimode linear optics, phase space displacements, auxiliary vacuum modes, and on-off photon detection. Our results indicate that, in some regimes, these currently available optical components are typically sufficient to achieve near-optimal unambiguous discrimination of multiple, multimode coherent states.
ORCID iDs
Sidhu, Jasminder S. ORCID: https://orcid.org/0000-0002-6167-8224, Bullock, Michael S., Guha, Saikat and Lupo, Cosmo;-
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Item type: Article ID code: 85592 Dates: DateEvent31 May 2023Published23 May 2023AcceptedSubjects: Science > Physics > Atomic physics. Constitution and properties of matter Department: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 23 May 2023 10:41 Last modified: 15 Nov 2024 01:16 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/85592