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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

Published on: September 5, 2019

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.

Science Advances

|October 18, 2019

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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.

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.

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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.