Bright Heralded Source Reaching Theoretical Single-Photon Purity

• URL: http://arxiv.org/abs/2404.03236v2
• Date: Wed, 12 Jun 2024 10:00:49 GMT
• Title: Bright Heralded Source Reaching Theoretical Single-Photon Purity
• Authors: Haoyang Wang, Huihong Yuan, Qiang Zeng, Lai Zhou, Haiqiang Ma, Zhiliang Yuan,
• Abstract summary: We derive the theoretical limit of single-photon purity of heralded single-photon sources. We demonstrate a bright, gigahertz-pulsed heralded source with the purity saturating the limit.
• Score: 4.431483076376284
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: We derive the theoretical limit of single-photon purity of heralded single-photon sources, and accordingly demonstrate a bright, gigahertz-pulsed heralded source with the purity saturating the limit. Based on spontaneous four-wave mixing in a silicon spiral waveguide, this on-chip source is measured to have a coincidence rate exceeding 1.5 MHz at a coincidence to accidental (CAR) ratio of 16.77. The single-photon purity, quantified by the auto-correlation function $g^{(2)}_h(0)$, reaches the theoretical limit with the lowest value of $0.00094 \pm 0.00002$ obtained at a coincidence rate of 0.8 kHz. We attribute our results to effective spectral filtering as well as the coherent pump condition helped by optical injection locking.

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