分类： 光学 >> 量子光学 提交时间： 2023-02-19
Yong Yu
Peng-Fei Sun
Yu-Zhe Zhang
Bing Bai
Yu-Qiang Fang
Xi-Yu Luo
Zi-Ye An
Jun Li
Jun Zhang
Feihu Xu
Xiao-Hui Bao
Jian-Wei Pan
摘要： In this paper we report an experiment that verifies an atomic-ensemble quantum memory via a measurement-device-independent scheme. A single photon generated via Rydberg blockade in one atomic ensemble is stored in another atomic ensemble via electromagnetically induced transparency. After storage for a long duration, this photon is retrieved and interfered with a second photon to perform joint Bell-state measurement (BSM). Quantum state for each photon is chosen based on a quantum random number generator respectively in each run. By evaluating correlations between the random states and BSM results, we certify that our memory is genuinely entanglement-preserving.
分类： 光学 >> 量子光学 提交时间： 2023-02-19
Xi-Yu Luo
Yong Yu
Jian-Long Liu
Ming-Yang Zheng
Chao-Yang Wang
Bin Wang
Jun Li
Xiao Jiang
Xiu-Ping Xie
Qiang Zhang
Xiao-Hui Bao
Jian-Wei Pan
摘要： Quantum internet gives the promise of getting all quantum resources connected, and it will enable applications far beyond a localized scenario. A prototype is a network of quantum memories that are entangled and well separated. Previous realizations are limited in the distance. In this paper, we report the establishment of remote entanglement between two atomic quantum memories physically separated by 12.5 km directly in a metropolitan area. We create atom-photon entanglement in one node and send the photon to a second node for storage. We harness low-loss transmission through a field-deployed fiber of 20.5 km by making use of frequency down-conversion and up-conversion. The final memory-memory entanglement is verified to have a fidelity of 90% via retrieving to photons. Our experiment paves the way to study quantum network applications in a practical scenario.
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