Entanglement-Enhanced Sensing in a Lossy and Noisy Environment
Author(s)Zhang, Zheshen; Wong, Franco N. C.; Shapiro, Jeffrey H.; Mouradian, Sara L.; Wong, Franco N. C.
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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.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
Physical Review Letters
American Physical Society
Zhang, Zheshen et al. “Entanglement-Enhanced Sensing in a Lossy and Noisy Environment.” Physical Review Letters 114.11 (2015): n. pag.
Final published version