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We developed a high-bandwidth optical quantum memory using microfabrication for quantum networks. This novel approach in the Paschen-Back regime achieves efficient, single-photon level storage for scalable quantum communication.

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Area of Science:

  • Quantum Information Science
  • Atomic Physics
  • Microfabrication Engineering

Background:

  • Scalability is a key challenge for quantum network components.
  • Microfabrication offers a path towards scalable quantum network hardware.
  • Existing quantum memory schemes face limitations in bandwidth and integration.

Purpose of the Study:

  • To demonstrate a high-bandwidth optical quantum memory suitable for quantum networks.
  • To leverage microfabrication for wafer-scale production of quantum memory devices.
  • To explore a novel ground-state quantum memory scheme in the Paschen-Back regime.

Main Methods:

  • Utilized a warm alkali atom ensemble within a microfabricated vapor cell.
  • Applied an external tesla-order magnetic field to access the hyperfine Paschen-Back regime.
  • Operated on the Rubidium-87 (⁸⁷Rb) D₂ line, matching bandwidth with single-photon sources.

Main Results:

  • Achieved bandwidth-matching for hundreds of megahertz broad light pulses.
  • Demonstrated an end-to-end efficiency of 3.12(17)% for 80 ns storage.
  • Attained an internal efficiency of 24(3)% and a signal-to-noise ratio of 7.9(8) at the single-photon level.

Conclusions:

  • Microfabricated vapor cells enable scalable, high-bandwidth quantum memories.
  • The demonstrated Paschen-Back regime scheme is promising for quantum network integration.
  • This work paves the way for practical, efficient quantum memory components.