@article{Habif:21,
author = {Jonathan L. Habif and Arunkumar Jagannathan and Samuel Gartenstein and Phoebe Amory and Saikat Guha},
journal = {Opt. Express},
keywords = {Coherent states; Heterodyne detection; Laser communications; Laser light; Optical sensing; Optical systems},
number = {5},
pages = {7418--7427},
publisher = {OSA},
title = {Quantum-limited discrimination of laser light and thermal light},
volume = {29},
month = {Mar},
year = {2021},
url = {http://www.osapublishing.org/oe/abstract.cfm?URI=oe-29-5-7418},
doi = {10.1364/OE.417989},
abstract = {Understanding the fundamental sensitivity limit of an optical sensor requires a full quantum mechanical description of the sensing task. In this work, we calculate the fundamental (quantum) limit for discriminating between pure laser light and thermal noise in a photon-starved regime. The Helstrom bound for discrimination error probability for single mode measurement is computed along with error probability bounds for direct detection, coherent homodyne detection and the Kennedy receiver. A generalized Kennedy (GK) receiver is shown to closely approach the Helstrom limit. We present an experimental demonstration of this sensing task and demonstrate a 15.4 dB improvement in discrimination sensitivity over direct detection using a GK receiver and an improvement of 19.4\&\#x0025; in error probability over coherent detection.},
}

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