Generation of Atom-Light Entanglement in an Optical Cavity for Quantum Enhanced Atom-Interferometery

TL;DR

This paper theoretically demonstrates how atom-light entanglement generated in an optical cavity via Raman superradiance can enhance atom interferometry sensitivity by reducing quantum noise through optimized optical measurement strategies.

Contribution

It shows that an optical cavity reduces the need for atomic seeding, enabling stronger correlations and greater quantum enhancement in atom-light entanglement for interferometry.

Findings

Optical cavity reduces atomic seed requirements.

Careful temporal shaping of local oscillator improves measurement.

Enhanced sensitivity in atom interferometry via atom-light entanglement.

Abstract

We theoretically investigate the generation of atom-light entanglement via Raman superradiance in an optical cavity, and show how this can be used to enhance the sensitivity of atom interferometry. We model a realistic optical cavity, and show that by careful temporal shaping of the optical local oscillator used to measure the light emitted from the cavity, information in the optical mode can be combined with the signal from the atom interferometer to reduce the quantum noise, and thus increase the sensitivity. It was found in Phys. Rev. Lett. 110, 053002 (2013) that an atomic `seed' was required in order to reduce spontaneous emission and allow for single mode behaviour of the device. In this paper we find that the optical cavity reduces the need for an atomic seed, which allows for stronger atom-light correlations and a greater level of quantum enhancement.