Entanglement-enhanced sensing in a lossy and noisy environment

Zheshen Zhang, Sara Mouradian, Franco N.C. Wong, Jeffrey H. Shapiro

Research output: Contribution to journalArticlepeer-review

205 Scopus citations


Nonclassical states are essential for optics-based quantum information processing, but their fragility limits their utility for practical scenarios in which loss and noise inevitably degrade, if not destroy, nonclassicality. Exploiting nonclassical states in quantum metrology yields sensitivity advantages over all classical schemes delivering the same energy per measurement interval to the sample being probed. These enhancements, almost without exception, are severely diminished by quantum decoherence. Here, we experimentally demonstrate an entanglement-enhanced sensing system that is resilient to quantum decoherence. We employ entanglement to realize a 20% signal-to-noise ratio improvement over the optimum classical scheme in an entanglement-breaking environment plagued by 14 dB of loss and a noise background 75 dB stronger than the returned probe light. Our result suggests that advantageous quantum-sensing technology could be developed for practical situations.

Original languageEnglish (US)
Article number110506
JournalPhysical review letters
Issue number11
StatePublished - Mar 20 2015
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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