Measurement-Device-Independent Verification of a Quantum Memory

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Abstract
In this Letter 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 a joint Bell-state measurement (BSM). The 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.
Funding Information
  • National Key Research and Development Program of China (2017YFA0303902, 2020YFA-0309804)
  • National Natural Science Foundation of China
  • Chinese Academy of Sciences
  • Anhui Initiative in Quantum Information Technologies