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Exploiting Nonlocal Correlations for Dispersion-Resilient Quantum Communications
Hao Yu1,2, Benjamin Crockett2, Nicola Montaut2
1Shimmer Center, Tianfu Jiangxi Laboratory, Chengdu 641419, People's Republic of China.
None:
Encoding quantum information via time-bin entangled states has had a profound impact on the development of quantum communications. However, dispersive propagation limits their achievable transmission distances. Here we describe a regime for nonlocal dispersion cancellation where the sum of arrival times of photons undergoing identical dispersion remains highly correlated. We exploit this effect to mitigate dispersive effects in a quantum key distribution fiber link, allowing an increase in the secret key rate by over a factor of 5 after 80 km of optical fiber dispersion.
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