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Fast, noise-free memory for photon synchronization at room temperature.

Ran Finkelstein1, Eilon Poem1, Ohad Michel1

  • 1Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel.

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Researchers developed a fast ladder memory (FLAME) using rubidium vapor for quantum photonic networks. This novel optical memory significantly enhances on-demand photon generation for future quantum technologies.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Photonics

Background:

  • Quantum photonic networks require efficient optical memories for synchronizing probabilistic quantum sources and gates.
  • Existing optical memories face limitations in bandwidth, noise, and lifetime, hindering quantum network development.

Purpose of the Study:

  • To demonstrate a fast ladder memory (FLAME) for coherent optical storage in rubidium vapor.
  • To improve the performance metrics of optical memories for quantum applications, including bandwidth, noise, and lifetime.

Main Methods:

  • Utilized a ladder-level system in rubidium vapor with nearly degenerate orbital transition frequencies.
  • Mapped optical fields onto superposition states between electronic orbitals for optical data storage.
  • Stored and retrieved 1.7-nanosecond optical pulses with low photon numbers.

Main Results:

  • Achieved a short-time external efficiency of 25% for stored and retrieved optical pulses.
  • Observed a memory lifetime (1/e) of 86 nanoseconds with minimal added noise (below 10^-4 photons).
  • Demonstrated the potential to enhance on-demand photon generation probability by a factor of 12 when coupled with probabilistic sources.

Conclusions:

  • The fast ladder memory (FLAME) offers high bandwidth, low noise, and long memory lifetime at room temperature.
  • This advancement paves the way for controlled production of large quantum states of light from probabilistic sources.
  • FLAME is a crucial step towards building robust and scalable quantum photonic networks.