Observation of quantum spin noise in a 1D light-atoms quantum interface

TL;DR

This paper reports the observation of quantum spin noise in a one-dimensional light-atom interface, demonstrating quantum nondemolition measurements and analyzing quantum fluctuations in a cold atomic ensemble near a nanofiber.

Contribution

It introduces a novel experimental setup for measuring quantum spin noise in a 1D atomic ensemble using a nanofiber, advancing the understanding of quantum measurement in such systems.

Findings

Achieved 40 dB quantum projection noise above detection noise.

Performed quantum nondemolition measurement of collective spin.

Analyzed effects of spatial inhomogeneity and atomic motion.

Abstract

We observe collective quantum spin states of an ensemble of atoms in a one-dimensional light-atom interface. Strings of hundreds of cesium atoms trapped in the evanescent fiel of a tapered nanofiber are prepared in a coherent spin state, a superposition of the two clock states. A weak quantum nondemolition measurement of one projection of the collective spin is performed using a detuned probe dispersively coupled to the collective atomic observable, followed by a strong destructive measurement of the same spin projection. For the coherent spin state we achieve the value of the quantum projection noise 40 dB above the detection noise, well above the 3 dB required for reconstruction of the negative Wigner function of nonclassical states. We analyze the effects of strong spatial inhomogeneity inherent to atoms trapped and probed by the evanescent waves. We furthermore study temporal dynamics of quantum fluctuations relevant for measurement-induced spin squeezing and assess the impact of thermal atomic motion. This work paves the road towards observation of spin squeezed and entangled states and many-body interactions in 1D spin ensembles.