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High-efficiency single-photon generation via large-scale active time multiplexing.

F Kaneda1, P G Kwiat1

  • 1Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

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Summary
This summary is machine-generated.

Researchers enhanced heralded single-photon source (HSPS) efficiency using time multiplexing. This breakthrough achieves a 9.7-fold increase, paving the way for scalable quantum information applications.

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Area of Science:

  • Quantum optics
  • Quantum information science

Background:

  • Deterministic generation of single- and multiphoton states is crucial for quantum technologies.
  • Heralded single-photon sources (HSPSs) are limited by probabilistic emission, hindering scalability.

Purpose of the Study:

  • To overcome the efficiency limitations of conventional HSPSs.
  • To demonstrate a scalable method for deterministic single-photon generation.

Main Methods:

  • Implemented large-scale time multiplexing of 40 conventional HSPSs.
  • Utilized an ultra-low loss, adjustable optical delay for photon stream synchronization.

Main Results:

  • Achieved a 9.7(5)-fold enhancement in HSPS efficiency.
  • Demonstrated a 66.7(24)% probability of collecting a single photon with 90% indistinguishability per cycle.
  • Investigated the trade-off between single-photon probability and multiphoton emission.

Conclusions:

  • Time multiplexing significantly improves HSPS efficiency, addressing scalability challenges.
  • The developed method enables efficient generation of high-quality single photons.
  • Future upgrades promise generation of >30 coincident photons for advanced quantum applications.