Cavity-Enhanced Atom-Photon Entanglement with Subsecond Lifetime
Xu-Jie Wang, Sheng-Jun Yang, Peng-Fei Sun, Bo Jing, Jun Li, Ming-Ti, Zhou, Xiao-Hui Bao, Jian-Wei Pan
TL;DR
This paper demonstrates a highly efficient, long-lived atom-photon entanglement memory using a ring cavity and optical lattice, achieving subsecond lifetime and verifying entanglement after 1 second.
Contribution
It introduces a novel method to extend atomic ensemble quantum memory lifetime to over a second with high efficiency and verified entanglement.
Findings
Memory efficiency of 38% at 0.1 second storage
Atom-photon entanglement verified after 1 second
Bell inequality violation with S=2.36±0.14
Abstract
A cold atomic ensemble suits well for optical quantum memories, and its entanglement with a single photon forms the building block for quantum networks that give promise for many revolutionary applications. Efficiency and lifetime are among the most important figures of merit for a memory. In this paper, we report the realization of entanglement between an atomic ensemble and a single-photon with subsecond lifetime and high efficiency. We engineer dual control modes in a ring cavity to create entanglement and make use of 3-dimensional optical lattice to prolong memory lifetime. The memory efficiency is 38% for 0.1 second storage. We verify the atom-photon entanglement after 1 second storage by testing the Bell inequality with a result of .
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