Quantum-enhanced interferometry with large heralded photon-number states

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Thekkadath, GS
Mycroft, ME
Bell, BA
Wade, CG
Eckstein, A
Phillips, DS
Patel, RB
Buraczewski, A
Lita, AE
Gerrits, T
Nam, SW
Stobińska, M
Lvovsky, AI
Walmsley, IA
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2020
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http://creativecommons.org/licenses/by/4.0/
Abstract

Quantum phenomena such as entanglement can improve fundamental limits on the sensitivity of a measurement probe. In optical interferometry, a probe consisting of N entangled photons provides up to a N−−√ enhancement in phase sensitivity compared to a classical probe of the same energy. Here, we employ high-gain parametric down-conversion sources and photon-number-resolving detectors to perform interferometry with heralded quantum probes of sizes up to N = 8 (i.e. measuring up to 16-photon coincidences). Our probes are created by injecting heralded photon-number states into an interferometer, and in principle provide quantum-enhanced phase sensitivity even in the presence of significant optical loss. Our work paves the way toward quantum-enhanced interferometry using large entangled photonic states.

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npj Quantum Information
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© The Author(s) 2020. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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Nanoelectronics
quant-ph
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Thekkadath, GS; Mycroft, ME; Bell, BA; Wade, CG; Eckstein, A; Phillips, DS; Patel, RB; Buraczewski, A; Lita, AE; Gerrits, T; Nam, SW; Stobińska, M; Lvovsky, AI; Walmsley, IA, Quantum-enhanced interferometry with large heralded photon-number states, npj Quantum Information, 2020, 6 (1), pp. 89
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