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Single-shot discrimination of coherent states beyond the standard quantum limit

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1364/OL.421646
AuthorSearch for: 1ORCID identifier: https://orcid.org/0000-0002-4366-2245; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-3797-412X; Search for: ; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-4714-0575
Affiliation
  1. National Research Council Canada. Security and Disruptive Technologies
FormatText, Article
Subjectcoherent states; diode lasers; matched filtering; photons; quantum communications; quantum key distribution
Abstract
The discrimination of coherent states is a key task in optical communication and quantum key distribution protocols. In this work, we use a photon-number-resolving detector, the transition-edge sensor, to discriminate binary-phase-shifted coherent states at a telecom wavelength. Owing to its dynamic range and high efficiency, we achieve a bit error probability that unconditionally exceeds the standard quantum limit (SQL) by up to 7.7 dB. The improvement to the SQL persists for signals containing up to approximately seven photons on average and is achieved in a single shot (i.e., without measurement feedback), thus making our approach compatible with larger bandwidths.
Publication date
PublisherOptica Publishing Group
In
  • Optics Letters 46, no. 11 (17 May 2021): 2565–2568.
LanguageEnglish
Peer reviewedYes
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Record identifier5f9b34b2-6c89-446f-a807-8445f21c259f
Record created2022-01-17
Record modified2022-01-18
Date modified: