| Literature DB >> 34131511 |
G S Thekkadath1, M E Mycroft2, B A Bell1, C G Wade1, A Eckstein1, D S Phillips1, R B Patel1, A Buraczewski2, A E Lita3, T Gerrits3,4, S W Nam3, M Stobińska2, A I Lvovsky1, I A Walmsley1,5.
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.Entities:
Year: 2020 PMID： 34131511 PMCID： PMC8201641 DOI： 10.1038/s41534-020-00320-y
Source DB: PubMed Journal: npj Quantum Inf ISSN： 2056-6387 Impact factor: 7.385