Observation of Highly Correlated Ultrabright Biphotons Through Increased Atomic Ensemble Density in Spontaneous Four-Wave Mixing

• URL: http://arxiv.org/abs/2312.12758v3
• Date: Sat, 10 Feb 2024 05:05:56 GMT
• Title: Observation of Highly Correlated Ultrabright Biphotons Through Increased Atomic Ensemble Density in Spontaneous Four-Wave Mixing
• Authors: Jiun-Shiuan Shiu, Zi-Yu Liu, Chin-Yao Cheng, Yu-Chiao Huang, Ite A. Yu, Ying-Cheng Chen, Chih-Sung Chuu, Che-Ming Li, Shiang-Yu Wang, Yong-Fan Chen
• Abstract summary: This study presents experimental findings on the pairing ratio, utilizing a double-$Lambda$ spontaneous four-wave mixing biphoton source in cold atoms. We achieved an ultrahigh biphoton generation rate of up to $1.3times107$ per second, with a successful pairing ratio of $61%$.
• Score: 1.67943158479452
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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-$\Lambda$ 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 $1.3\times10^7$ 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 $5.0 \times 10^4$ per second, we attained an impressive signal-to-background ratio of 241 for the biphoton wavepacket, surpassing the Cauchy-Schwarz criterion by approximately $1.5\times10^4$ times.

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