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Published April 20, 2017 | Supplemental Material + Submitted + Published
Journal Article Open

Quantum-enhanced interferometry with weak thermal light

Abstract

We propose and implement a procedure for enhancing the sensitivity with which one can determine the phase shift experienced by a thermal light beam possessing on average fewer than four photons in passing through an interferometer. Our procedure entails subtracting exactly one (which can be generalized to m) photon from the light field exiting an interferometer containing a phase-shifting element in one of its arms. As a consequence of the process of photon subtraction, the mean photon number and signal-to-noise ratio (SNR) of the resulting light field are increased, leading to an enhancement of the SNR of the interferometric signal for that fraction of the incoming data that leads to photon subtraction.

Additional Information

© 2017 Optical Society of America. Received 22 August 2016; revised 16 February 2017; accepted 27 March 2017 (Doc. ID 274217); published 20 April 2017. We acknowledge funding from the Defense Advanced Research Projects Agency. Funding: Defense Advanced Research Projects Agency (DARPA).

Attached Files

Published - optica-4-4-487.pdf

Submitted - 1605.05424.pdf

Supplemental Material - optica44487s001.PDF

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August 19, 2023
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October 20, 2023