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- W4207025364 abstract "We propose a scheme for covert active sensing using floodlight illumination from a terahertz-bandwidth amplified spontaneous emission (ASE) source and heterodyne detection. We evaluate the quantum-estimation-theoretic performance limit of covert sensing, wherein a transmitter's attempt to sense a target phase is kept undetectable to a quantum-equipped passive adversary, by hiding the signal photons under the thermal noise floor. Despite the quantum state of each mode of the ASE source being mixed (thermal), and hence inferior compared to the pure coherent state of a laser mode, the thousand-times-higher optical bandwidth of the ASE source results in achieving a substantially superior performance compared to a narrow-band laser source by allowing the probe light to be spread over many more orthogonal temporal modes within a given integration time. Even though our analysis is restricted to single-mode phase sensing, this system could be applicable or extendible for various practical optical sensing applications." @default.
- W4207025364 created "2022-01-26" @default.
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- W4207025364 date "2019-06-18" @default.
- W4207025364 modified "2023-09-28" @default.
- W4207025364 title "Covert sensing using floodlight illumination" @default.
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- W4207025364 doi "https://doi.org/10.1103/physreva.99.062321" @default.
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