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Distributed quantum metrology with a single squeezed-vacuum source

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We propose an interferometric scheme for the estimation of a linear combination with non-negative weights of an arbitrary number M > 1 of unknown phase delays, distributed across an M-channel linear optical network, with Heisenberg-limited sensitivity. This is achieved without the need of any sources of photon-number or entangled states, photon-number resolving detectors or auxiliary interferometric channels. Indeed, the proposed protocol remarkably relys upon a single squeezed-state source, an antisqueezing operation at the interferometer output, and on-off photodetectors.
Original languageEnglish
JournalPhysical Review Research
Publication statusAccepted for publication - 7 Oct 2019

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  • antisq_main

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    Accepted author manuscript (Post-print), 269 KB, PDF document

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