期刊
NPJ QUANTUM INFORMATION
卷 6, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41534-020-00320-y
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资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Networked Quantum Information Technologies Hub (NQIT) as part of the UK National Quantum Technologies Programme [EP/N509711/1]
- Foundation for Polish Science [POIR.04.04.00-00-220E/16-00, FIRST TEAM/2016-2/17]
- European Union under the European Regional Development Fund
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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