An efficient quantum light–matter interface with sub-second lifetime
By Sheng-Jun Yang, Xu-Jie Wang, Xiao-Hui Bao, Jian-Wei Pan. Nature Photonics, 2015
195 citations recorded by the source corpus.
An efficient light–matter interface for quantum repeaters is developed. By placing Rb atoms optically confined in a 3D lattice in a ring cavity, an initial retrieval efficiency of 76% together with a 1/e lifetime of 0.22 s are achieved. Quantum repeaters1 hold promise for scalable long-distance quantum communication. The basic building block is a quantum light–matter interface that generates non-classical correlations between light and a quantum memory2. Significant progress has been made in improving the performance of this interface3,4, but further development of quantum repeater is hindered by the difficulty of integrating the key capabilities into a single system4. Here we report a high-performance interface with an efficiency and lifetime that fulfil the requirement of a quantum repeater. By confining cold atoms with a three-dimensional optical lattice and enhancing the atom–photon coupling with a ring cavity, we observe an initial retrieval efficiency of 76 ± 5% together with a 1/e lifetime of 0.22 ± 0.01 s, which supports a sub-Hz entanglement distribution of up to 1,000 km through the Duan-Lukin-Cirac-Zoller (DLCZ) protocol2. Together with an efficient telecom interface5,6 and moderate multiplexing7, our result may enable a quantum repeater system that beats direct transmission in the near future4.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/491855a3d68e34947a45fe0d3f3bb73bd2a0006b
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In Artificial Intelligence
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Micius quantum experiments in space (2022, methodology): “However, the current state of quantum memories (Yang et al., 2016) and quantum repeaters remains far beyond practical application in realistic long-distance quantum communications; see Sec.”