@article{eaed2ffa5ac24e60840c7305842e813c,
title = "Large-alphabet encoding for higher-rate quantum key distribution",
abstract = "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.",
author = "Catherine Lee and Darius Bunandar and Zheshen Zhang and Steinbrecher, {Gregory R.} and {Ben Dixon}, P. and Wong, {Franco N.C.} and Shapiro, {Jeffrey H.} and Hamilton, {Scott A.} and Dirk Englund",
note = "Funding Information: U.S. Air Force (FA8721-05-C-0002 and/or FA8702-15-D-0001); Air Force Office of Scientific Research Multidisciplinary University Research Initiative (FA9550-14-1-0052); Air Force Research Laboratory RITA (FA8750-14-2-0120); Office of Naval Research CONQUEST (N00014-16-C-2069). Distribution statement A. Approved for public release: distribution unlimited. This material is based upon work supported by the Assistant Secretary of Defense for Research and Engineering under Air Force Contract No. FA8721-05-C-0002 and/or FA8702-15-D-0001. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the Assistant Secretary of Defense for Research and Engineering. D.E. and D.B. acknowledge partial support from the Air Force Office of Scientific Research Multidisciplinary University Research Initiative (FA9550-14-1-0052) and the Air Force Research Laboratory RITA program (FA8750-14-2-0120). D.B. also acknowledges partial support from the Office of Naval Research CONQUEST program (N00014-16-C-2069) and the Samsung Advanced Institute of Technology. C.L. thanks David Caplan and Nivedita Chandrasekaran for helpful discussions. Funding Information: Distribution statement A. Approved for public release: distribution unlimited. This material is based upon work supported by the Assistant Secretary of Defense for Research and Engineering under Air Force Contract No. FA8721-05-C-0002 and/or FA8702-15-D-0001. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the Assistant Secretary of Defense for Research and Engineering. D.E. and D.B. acknowledge partial support from the Air Force Office of Scientific Research Multidisciplinary University Research Initiative (FA9550-14-1-0052) and the Air Force Research Laboratory RITA program (FA8750-14-2-0120). D.B. also acknowledges partial support from the Office of Naval Research CONQUEST program (N00014-16-C-2069) and the Samsung Advanced Institute of Technology. Chandrasekaran for helpful discussions. Publisher Copyright: {\textcopyright} 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.",
year = "2019",
doi = "10.1364/OE.27.017539",
language = "English (US)",
volume = "27",
pages = "17539--17549",
journal = "Optics Express",
issn = "1094-4087",
publisher = "The Optical Society",
number = "13",
}