Continuous Cold-atom Inertial Sensor with $1\ \text{nrad.s}^{-1}$ Rotation Stability

TL;DR

This paper demonstrates a continuous cold-atom gyroscope achieving record rotation stability of 1 nrad/s at 10,000 seconds, significantly advancing inertial sensing capabilities by eliminating dead times and enhancing sensitivity.

Contribution

It introduces a joint interrogation scheme for continuous operation of cold-atom inertial sensors, improving short-term sensitivity and achieving record rotation stability.

Findings

Achieved rotation sensitivity of 100 nrad/s/Hz^{1/2}.

Demonstrated rotation stability of 1 nrad/s at 10^4 seconds.

Enabled continuous operation to reach quantum noise-limited sensitivity.

Abstract

We report the operation of a cold-atom inertial sensor which continuously captures the rotation signal. Using a joint interrogation scheme, where we simultaneously prepare a cold-atom source and operate an atom interferometer (AI) enables us to eliminate the dead times. We show that such continuous operation improves the short-term sensitivity of AIs, and demonstrate a rotation sensitivity of $100\ \text{nrad.s}^{-1}.\text{Hz}^{-1/2}$ in a cold-atom gyroscope of $11 \ \text{cm}^2$ Sagnac area. We also demonstrate a rotation stability of $1 \ \text{nrad.s}^{-1}$ at $10^4$ s of integration time, which establishes the record for atomic gyroscopes. The continuous operation of cold-atom inertial sensors will enable to benefit from the full sensitivity potential of large area AIs, determined by the quantum noise limit.