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Long-Lived Solid-State Optical Memory for High-Rate Quantum Repeaters.

Mohsen Falamarzi Askarani1, Antariksha Das1, Jacob H Davidson1

  • 1QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, Netherlands.

Physical Review Letters
|December 10, 2021
PubMed
Summary

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This summary is machine-generated.

Long optical storage times are crucial for quantum repeaters. Tm:YGG crystals demonstrate promising optical storage capabilities, paving the way for high-rate entanglement distribution in quantum networks.

Area of Science:

  • Quantum Information Science
  • Materials Science for Quantum Technologies

Background:

  • Quantum repeaters require long optical storage times for high-rate entanglement distribution over large distances.
  • The Tm:YGG crystal system is investigated for its potential in quantum memory applications.

Purpose of the Study:

  • To investigate the optical storage properties of the 795.325 nm transition in Tm:YGG.
  • To demonstrate the feasibility of using Tm:YGG for multiplexed quantum memories and repeater-based quantum networks.

Main Methods:

  • Characterization of the optical coherence time of the Tm:YGG crystal.
  • Demonstration of optical storage using the atomic frequency comb protocol with laser pulses.
  • Evaluation of memory decay time (T_m) and multiplexed storage capabilities.

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Main Results:

  • Achieved an optical coherence time of 1.1 ms in Tm:YGG.
  • Demonstrated optical storage for up to 100 μs and a memory decay time (T_m) of 13.1 μs.
  • Successfully implemented multiplexed storage with feed-forward control and quantum state storage of photon pairs.

Conclusions:

  • Tm:YGG exhibits significant potential for developing quantum memories with extended optical storage durations.
  • The demonstrated capabilities of Tm:YGG advance the development of repeater-based quantum networks with enhanced entanglement distribution rates.