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Asynchronous quantum repeater using multiple quantum memory.

Chen-Long Li1,2, Hua-Lei Yin1,2,3, Zeng-Bing Chen1

  • 1National Laboratory of Solid State Microstructures and School of Physics, Collaborative Innovation Center of Advanced Microstrucstures, Nanjing University, Nanjing 210093, People's Republic of China.

Reports on Progress in Physics. Physical Society (Great Britain)
|November 13, 2024
PubMed
Summary
This summary is machine-generated.

We introduce a novel quantum repeater protocol that enhances entanglement generation for quantum networks. This method reduces stability requirements and offers superior performance compared to existing protocols.

Keywords:
asynchronous pairingentanglement generationmultiple quantum memoryquantum communicationquantum repeater

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Area of Science:

  • Quantum Information Science
  • Quantum Communication
  • Quantum Networking

Background:

  • Quantum networks require entangled links between remote locations, facilitated by quantum repeaters.
  • The Duan-Lukin-Cirac-Zoller protocol, a standard for quantum repeaters, uses single-photon interference (SPI).
  • SPI necessitates high phase stability and cannot generate maximally entangled states.

Purpose of the Study:

  • To propose a new quantum repeater protocol that overcomes limitations of existing methods.
  • To enhance the efficiency and stability of entanglement distribution in quantum networks.
  • To enable the generation of maximally entangled states in principle.

Main Methods:

  • A novel quantum repeater protocol based on the concept of post-matching is proposed.
  • The protocol's implementation is outlined using a Kerr nonlinear resonator.
  • Numerical simulations are employed to evaluate the protocol's performance under a generic noise model.

Main Results:

  • The proposed post-matching protocol achieves efficiency comparable to the SPI protocol.
  • It significantly reduces the stringent phase-stability requirements of SPI.
  • The protocol demonstrates superiority over existing methods in simulations and can generate maximally entangled states.

Conclusions:

  • The proposed quantum repeater protocol offers a viable solution for building large-scale quantum communication networks.
  • It represents a significant advancement towards achieving fully-connected quantum networks.
  • The method's reduced stability needs and enhanced entanglement generation capabilities are key advantages.