Precision Minimally-destructive detection of ultra-cold atomic ensembles

TL;DR

This paper introduces a minimally-destructive, dispersive light-based measurement technique for ultra-cold atomic ensembles, enabling precise atom number control with minimal impact on the quantum state, suitable for quantum-enhanced measurements.

Contribution

It presents a novel measurement method that allows accurate atom number determination while preserving the ensemble's quantum coherence, advancing quantum measurement and control capabilities.

Findings

Achieves precise atom number measurement with minimal decoherence.

Enables preparation of specific atom-number states for quantum experiments.

Suitable for quantum-enhanced measurement protocols.

Abstract

Over the last two decades the cold-atom physics has matured from proof-of-principle demonstrations to a versatile platform for precision measurements and study of quantum phenomena. Ultra-cold atomic ensembles have been used both for technological and fundamental science applications. To fully exploit their potential, a precise measurement and control of the atom number in the ensemble is crucial. We report on a precise, minimally-destructive measurement technique that can be used to prepare an atomic ensemble with a desired atom number. The measurement relies on the dispersive light-atom interaction, thus it is expected to have a negligible effect on the ensemble temperature and to induce minimal decoherence in the atomic quantum state. As a result, it can be used to perform quantum-enhanced measurements and prepare the atom-number state at the start of an interferometer sequence.