Observation of Highly Correlated Ultrabright Biphotons Through Increased Atomic Ensemble Density in Spontaneous Four-Wave Mixing
arxiv(2023)
摘要
The pairing ratio, a crucial metric assessing a biphoton source's ability to
generate correlated photon pairs, remains underexplored despite theoretical
predictions. This study presents experimental findings on the pairing ratio,
utilizing a double-Λ spontaneous four-wave mixing biphoton source in
cold atoms. At an optical depth (OD) of 20, we achieved an ultrahigh biphoton
generation rate of up to 1.3×10^7 per second, with a successful pairing
ratio of 61%. Increasing the OD to 120 significantly improved the pairing
ratio to 89%, while maintaining a consistent biphoton generation rate. This
achievement, marked by high generation rates and robust biphoton pairing, holds
great promise for advancing efficiency in quantum communication and information
processing. Additionally, in a scenario with a lower biphoton generation rate
of 5.0 × 10^4 per second, we attained an impressive signal-to-background
ratio of 241 for the biphoton wavepacket, surpassing the Cauchy-Schwarz
criterion by approximately 1.5×10^4 times.
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