Ultra-high-rate nonclassical light source with 50 GHz-repetition-rate mode-locked pump pulses and multiplexed single-photon detectors

Kentaro Wakui, Yoshiaki Tsujimoto, Mikio Fujiwara, Isao Morohashi, Tadashi Kishimoto, Fumihiro China, Masahiro Yabuno, Shigehito Miki, Hirotaka Terai, Masahide Sasaki, Masahiro Takeoka

Research output: Contribution to journalArticlepeer-review

Abstract

Heralded single photons (HSPs) and entangled photon pairs (EPPs) via spontaneous parametric down-conversion are essential tools for the development of photonic quantum information technologies. In this paper, we report a novel ultra-high-rate nonclassical light source realized by developing 50 GHz-repetition-rate mode-locked pump pulses and multiplexed superconducting nanowire single-photon detectors. The presence of the single-photon state in the heralded photons with our setup was indicated by the second-order intensity correlation below 1/2 at the heralding rate over 20 Mcps. Even at the rate beyond 50 Mcps, the nonclassicality was still observed with the intensity correlation below unity. Moreover, our setup is also applicable to the polarization-EPP experiment, where we obtained the maximum coincidence rate of 1.6 Mcps with the fidelity of 0.881 ± (0.254 × 10−3) to the maximally entangled state. Our versatile source could be a promising tool to explore various large-scale quantum-photonic experiments with low success probability and heavy attenuation.

Original languageEnglish
Pages (from-to)22399-22411
Number of pages13
JournalOptics Express
Volume28
Issue number15
DOIs
Publication statusPublished - 2020 Jul 20
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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