# A supersolid-based gravimeter in a ring cavity

## TL;DR

This paper introduces a new gravimeter design using a supersolid-like Bose-Einstein condensate in a ring cavity, achieving high sensitivity and robustness against photon losses for precise gravitational measurements.

## Contribution

It proposes a novel supersolid-based interferometer that leverages a driven Bose-Einstein condensate coupled to optical modes for enhanced gravitational sensing.

## Key findings

- Sensitivity scales with atom number similar to Heisenberg limit
- Robust against photon losses due to phase insensitivity
- Potential sensitivity of 10^{-10} to 10^{-8} for 500,000 atoms

## Abstract

We propose a novel type of composite light-matter interferometer based on a supersolid-like phase of a driven Bose-Einstein condensate coupled to a pair of degenerate counterpropagating electromagnetic modes of an optical ring cavity. The supersolid-like condensate under the influence of the gravity drags the cavity optical potential with itself, thereby changing the relative phase of the two {cavity electromagnetic fields}. Monitoring the phase evolution of the cavity output fields thus allows for a nondestructive measurement of the gravitational acceleration. We show that the sensitivity of the proposed gravimeter exhibits Heisenberg-like scaling with respect to the atom number. As the relative phase of the cavity fields is insensitive to photon losses, the gravimeter is robust against these deleterious effects. For state-of-the-art experimental parameters, the relative sensitivity $\Delta g/g$ of such a gravimeter could be of the order of $10^{-10}$--$10^{-8}$ for a condensate of a half a million atoms and interrogation time of the order of a few seconds.