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Quantum-enhanced interferometry with large heralded photon-number states.

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 towards quantum-enhanced interferometry using large entangled photonic states.

SUBMITTER: Thekkadath GS

PROVIDER: S-EPMC8201641 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Quantum-enhanced interferometry with large heralded photon-number states.

Thekkadath G S GS Mycroft M E ME Bell B A BA Wade C G CG Eckstein A A Phillips D S DS Patel R B RB Buraczewski A A Lita A E AE Gerrits T T Nam S W SW Stobińska M M Lvovsky A I AI Walmsley I A IA

NPJ quantum information 20200101 1

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 <i>N</i> = 8 (i.e. measuring up to 16-photon ...[more]

PMID: 34131511

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