Temporally-ultralong biphotons with a linewidth of 50 kHz
- URL: http://arxiv.org/abs/2205.13778v1
- Date: Fri, 27 May 2022 06:31:54 GMT
- Title: Temporally-ultralong biphotons with a linewidth of 50 kHz
- Authors: Yu-Sheng Wang, Kai-Bo Li, Chao-Feng Chang, Tan-Wen Lin, Jian-Qing Li,
Shih-Si Hsiao, Jia-Mou Chen, Yi-Hua Lai, Ying-Cheng Chen, Yong-Fan Chen,
Chih-Sung Chuu, Ite A. Yu
- Abstract summary: This work has demonstrated a high-efficiency ultranarrow-linewidth biphoton source, and has made a substantial advancement in the quantum technology utilizing heralded single photons.
- Score: 1.0555828074181728
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We report the generation of biphotons, with a temporal full width at the half
maximum (FWHM) of 13.4$\pm$0.3 $\mu$s and a spectral FWHM of 50$\pm$1 kHz, via
the process of spontaneous four-wave mixing. The temporal width is the longest,
and the spectral linewidth is the narrowest up to date. This is also the first
biphoton result that obtains a linewidth below 100 kHz, reaching a new
milestone. The very long biphoton wave packet has a signal-to-background ratio
of 3.4, which violates the Cauchy-Schwarz inequality for classical light by 4.8
folds. Furthermore, we demonstrated a highly-tunable-linewidth biphoton source
and showed that while the biphoton source's temporal and spectral width were
controllably varied by about 24 folds, its generation rate only changed by less
than 15\%. A spectral brightness or generation rate per pump power per
linewidth of 1.2$\times$10$^6$ pairs/(s$\cdot$mW$\cdot$MHz) was achieved at the
temporal width of 13.4 $\mu$s. The above results were made possible by the low
decoherence rate and high optical depth of the experimental system, as well as
the nearly phase-mismatch-free scheme employed in the experiment. This work has
demonstrated a high-efficiency ultranarrow-linewidth biphoton source, and has
made a substantial advancement in the quantum technology utilizing heralded
single photons.
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