Bright Heralded Single-Photon Source with Ideal Purity
arxiv(2024)
摘要
We demonstrate an unprecedentedly bright heralded single-photon source with
ideal single-photon purity. The source is based on spontaneous four-wave mixing
in silicon spiral waveguide excited by a pump with a repetition rate of 2.5
GHz. An explicit theoretical limit of purity of heralded single-photon source
is derived, depending on Possoinian and thermal-like light pump, respectively.
The measured coincidence counting rate exceeds 1.5 MHz, and the purity
estimated by the second-order correlation function reaches the limit with a
lowest value of 0.000945 (at a coincidence rate of 0.8 kHz), which has never
been achieved by on-chip SFWM sources.
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