Distributed quantum metrology with a single squeezed-vacuum source

Dario Gatto, Paolo Facchi, Frank A. Narducci, Vincenzo Tamma

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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
Article number032024(R)
JournalPhysical Review Research
Publication statusPublished - 25 Nov 2019


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