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Measurement-Device-Independent Verification of a Quantum Memory.

Yong Yu1, Peng-Fei Sun1, Yu-Zhe Zhang1

  • 1Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China; and CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

Physical Review Letters
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PubMed
Summary
This summary is machine-generated.

This experiment demonstrates a quantum memory that preserves entanglement using a measurement-device-independent scheme. This verifies the integrity of quantum information stored for extended periods.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Quantum Optics

Background:

  • Quantum memories are crucial for quantum networks and computing.
  • Verifying entanglement preservation in quantum memories is experimentally challenging.
  • Existing verification methods can be susceptible to detector inefficiencies.

Purpose of the Study:

  • To experimentally verify the entanglement-preserving capabilities of an atomic-ensemble quantum memory.
  • To implement a measurement-device-independent (MDI) scheme for robust verification.
  • To demonstrate long-duration storage and retrieval of quantum states.

Main Methods:

  • Generating a single photon using Rydberg blockade in an atomic ensemble.
  • Storing the photon in a second atomic ensemble via electromagnetically induced transparency (EIT).
  • Retrieving the photon after long storage and performing a joint Bell-state measurement (BSM) with a second photon.
  • Utilizing a quantum random number generator to assign quantum states to photons.

Main Results:

  • Successful long-duration storage and retrieval of single photons.
  • Demonstration of entanglement preservation certified by Bell-state measurements.
  • Verification of the quantum memory's performance using a measurement-device-independent protocol.

Conclusions:

  • The atomic-ensemble quantum memory is certified as genuinely entanglement preserving.
  • The MDI scheme provides a robust method for verifying quantum memory performance.
  • This work advances the development of reliable quantum memories for quantum information processing.