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arXiv · 2608.29515

Demonstration of traveling-wave interactions between spontaneous photon emissions and atoms in a chiral F-P cavity

Jiajin Lu·Minjie Wang·Haole Jiao·Xiang Chen·Hongze Zhang·Shujing Li·Hai Wang
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Abstract

The enhancement of atom-photon interactions with F-P cavities provides a suitable platform for studying quantum optics and atomic physics. However, the emission fields in linear F-P cavities are in the standing-wave mode, which leads to non-uniform atom-photon coupling and a short storage lifetime of cavity-enhanced spin-wave quantum storages. This study experimentally demonstrates traveling-wave atom-light interactions in an F-P cavity that can preserve light helicity. First, a bias magnetic field is applied along the z-axis to define the quantization axis, which lifts the Zeeman degeneracy and breaks the time reversal symmetry. Next, non-classically correlated pairs of Stokes photons and spin waves are produced based on the Duan-Lukin-Cirac-Zoller scheme. The Stokes photons initially emitted from a single circularly polarized atomic transition have left-and right-hand circular polarizations when propagating along the +z (forward) and -z (backward) directions, which are preserved in the chiral cavity within the atom-photon interaction region. Thus, when the forward and backward Stokes fields resonate with the cavity, they may interact with the atoms in a traveling-wave manner. This is confirmed by measuring the time-dependent retrieval efficiencies of spin waves correlated with the forward and backward Stokes fields. This work paves the way for demonstrating traveling-wave atom-photon interactions in F-P cavities.

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Jiajin Lu, Minjie Wang, Haole Jiao, Xiang Chen, Hongze Zhang, Shujing Li, Hai Wang. 2026-08-30. Demonstration of traveling-wave interactions between spontaneous photon emissions and atoms in a chiral F-P cavity. https://arxiv.org/abs/2608.29515

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