Large-alphabet encoding for higher-rate quantum key distribution
Author(s)Lee, Catherine; Bunandar, Darius; Zhang, Zheshen; Steinbrecher, Gregory R.; Dixon, P. Benjamin; Wong, Franco N. C.; Shapiro, Jeffrey H; Hamilton, Scott A; Englund, Dirk R.; ... Show more Show less
MetadataShow full item record
The manipulation of high-dimensional degrees of freedom provides new opportunities for more efficient quantum information processing. It has recently been shown that high-dimensional encoded states can provide significant advantages over binary quantum states in applications of quantum computation and quantum communication. In particular, high-dimensional quantum key distribution enables higher secret-key generation rates under practical limitations of detectors or light sources, as well as greater error tolerance. Here, we demonstrate high-dimensional quantum key distribution capabilities both in the laboratory and over a deployed fiber, using photons encoded in a high-dimensional alphabet to increase the secure information yield per detected photon. By adjusting the alphabet size, it is possible to mitigate the effects of receiver bottlenecks and optimize the secret-key rates for different channel losses. This work presents a strategy for achieving higher secret-key rates in receiver-limited scenarios and marks an important step toward high-dimensional quantum communication in deployed fiber networks.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Lincoln Laboratory
The Optical Society
Lee, Catherine et al. “Large-alphabet encoding for higher-rate quantum key distribution.” Optics Express, 27, 13 (June 2019): 350067 © 2019 The Author(s)
Final published version