Resolution and sensitivity of a Fabry-Perot interferometer with a photon-number-resolving detector

TL;DR

This paper demonstrates that using photon-number-resolving detectors in a Fabry-Perot interferometer enhances resolution and sensitivity, enabling more precise measurements and supersensitivity with N-photon states.

Contribution

It introduces a novel approach combining photon-number-resolving detection with a Fabry-Perot interferometer to improve measurement precision and achieve supersensitivity.

Findings

Interference fringes compress with increasing photon number.

Higher precision in locating interference maxima compared to classical methods.

Theoretically predicts supersensitivity with N-photon states.

Abstract

With photon-number resolving detectors, we show compression of interference fringes with increasing photon numbers for a Fabry-Perot interferometer. This feature provides a higher precision in determining the position of the interference maxima compared to a classical detection strategy. We also theoretically show supersensitivity if N-photon states are sent into the interferometer and a photon-number resolving measurement is performed.