SU(1,1)-type light-atom correlated interferometer

TL;DR

This paper proposes an SU(1,1)-type hybrid light-atom interferometer utilizing quantum correlations, achieving near-Heisenberg phase sensitivity and exploring effects of loss and dephasing, offering new measurement techniques.

Contribution

It introduces a novel hybrid light-atom interferometer based on SU(1,1) symmetry, demonstrating enhanced phase sensitivity and potential for diverse wave coupling in quantum measurements.

Findings

Phase sensitivity approaches the Heisenberg limit with coherent squeezed states.

Loss and dephasing effects reduce phase sensitivity but can be mitigated.

Nonlinear processes enable coupling of different waves for new measurement methods.

Abstract

The quantum correlation of light and atomic collective excitation can be used to compose an SU(1,1)-type hybrid light-atom interferometer, where one arm in optical SU(1,1) interferometer is replaced by the atomic collective excitation. The phase-sensing probes include not only the photon field but also the atomic collective excitation inside the interferometer. For a coherent squeezed state as the phase-sensing field, the phase sensitivity can approach the Heisenberg limit under the optimal conditions. We also study the effects of the loss of light field and the dephasing of atomic excitation on the phase sensitivity. Since nonlinear processes are involved in this interferometer, they can couple a variety of different waves and form new types of hybrid interferometers, which provides a new method for basic measurement using the hybrid interferometers.