Non-destructive monitoring of Bloch oscillations in an optical cavity

TL;DR

This paper demonstrates a non-destructive method to monitor Bloch oscillations in cold atoms using an optical cavity, enabling continuous observation and potentially enhancing measurement precision for quantum sensing applications.

Contribution

It introduces a cavity-based approach for real-time, non-destructive monitoring of Bloch oscillations, improving upon destructive measurement techniques.

Findings

Cavity coupling allows continuous observation of Bloch oscillations.

Single atomic sample suffices for full oscillation mapping.

Potential for improved precision in quantum force measurements.

Abstract

Bloch oscillations are a hallmark of coherent wave dynamics in periodic potentials. They occur as the response of quantum mechanical particles in a lattice if a weak force is applied. In optical lattices with their perfect periodic structure they can be readily observed and employed as a quantum mechanical force sensor, for example, for precise measurements of the gravitational acceleration. However, the destructive character of the measurement process in previous experimental implementations poses serious limitations for the precision of such measurements. In this article we show that the use of an optical cavity operating in the regime of strong cooperative coupling allows one to directly monitor Bloch oscillations of a cloud of cold atoms in the light leaking out of the cavity. Hence, with a single atomic sample the Bloch oscillation dynamics can be mapped out, while in previous experiments, each data point required the preparation of a new atom cloud. The use of a cavity-based monitor should greatly improve the precision of Bloch oscillation measurements for metrological purposes.