Cavity-Enhanced Atom-Photon Entanglement with Subsecond Lifetime
- 2 March 2021
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 126 (9), 090501
- https://doi.org/10.1103/physrevlett.126.090501
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 Letter, 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 three-dimensional optical lattice to prolong memory lifetime. The memory efficiency is 38% for 0.1 s storage. We verify the atom-photon entanglement after 1 s storage by testing the Bell inequality with a result of .
Keywords
Funding Information
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- National Key R&D Program of China (2017YFA0303902)
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