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Interferometry-Integrated Noise-Immune Quantum Memory.

Zhifei Yu1, Zeliang Wu1, Xuejie Li1

  • 1State Key Laboratory of Precision Spectroscopy, School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China.

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|October 28, 2023
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Summary
This summary is machine-generated.

This study introduces a novel quantum memory that integrates photon-correlated quantum interferometry to erase excess noise. This innovation enhances memory efficiency and suppresses noise, paving the way for practical quantum information technologies.

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Area of Science:

  • Quantum Information Science
  • Quantum Optics
  • Atomic Physics

Background:

  • Practical quantum information technologies require quantum memory with low noise, high efficiency, and high bandwidth.
  • Excess noise during quantum information processing can degrade quantum states.
  • Current quantum memory technologies face challenges in simultaneously achieving high performance metrics.

Purpose of the Study:

  • To develop a quantum memory with built-in excess-noise erasure capabilities.
  • To enhance quantum memory efficiency and suppress noise to the vacuum level.
  • To demonstrate the performance of this novel quantum memory in a rubidium vapor cell.

Main Methods:

  • Integration of photon-correlated quantum interferometry within a quantum memory system.
  • Utilizing destructive interference to suppress excess noise.
  • Demonstration using a rubidium vapor cell and a 10-ns-long photonics signal.

Main Results:

  • Observed approximately 80% noise suppression.
  • Enhanced write-in efficiency from 87% to 96.2% with interferometry.
  • Achieved memory efficiency (excluding noise) improved from 70% to 77%.
  • Demonstrated high fidelity (93.7%) at the single-photon level, surpassing the no-cloning limit.

Conclusions:

  • The developed quantum memory effectively suppresses excess noise and enhances efficiency.
  • This interferometry-integrated quantum memory represents a significant advancement in quantum information processing.
  • The technology simultaneously achieves low noise, high bandwidth, high efficiency, and ease of operation.