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Dirk R. Englund. Lee, Catherine, Ph. D. Massachusetts Institute of Technology Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science 2018-05-23T16:33:57Z 2018-05-23T16:33:57Z 2018 2018 http://hdl.handle.net/1721.1/115768 1036987537 Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018. Cataloged from PDF version of thesis. Includes bibliographical references (pages 129-143). Quantum key distribution (QKD) exploits the inherent strangeness of quantum mechanics to improve secure communication, enabling two pre-authenticated participants to establish symmetric encryption keys over long distances, without making any assumptions about the computational abilities of an adversary. QKD commonly relies on the transmission and detection of single photons to distribute the secret keys, but the secret-key generation rates are often limited by hardware, namely the ability to produce or detect nonclassical states of light. We address this challenge by using high-dimensional encoding to increase the secure information yield per detected photon. In this thesis, we present security analysis for and the first demonstrations of a resource-efficient high-dimensional QKD protocol, including two varieties of implementation that each have different strengths and weaknesses. We introduce a 42-km deployed fiber testbed that we use to demonstrate our high-dimensional QKD protocol. We also demonstrate the violation of a steering inequality, confirming that we can produce entanglement in the lab and distribute it over the deployed fiber. By these experiments, we demonstrate both the utility of our high-dimensional QKD protocol and the feasibility of our testbed for further applications in quantum communication and networking. Supported by the DARPA Information in a Photon program from the Army Research Office W911NF-10-1-0416 Support by the Columbia Optics and Quantum Electronics IGERT under NSF DGE-1069420 by Catherine Lee. Ph.D. 143 pages eng Massachusetts Institute of Technology MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582 Electrical Engineering and Computer Science. High-dimensional quantum communication over deployed fiber Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="9f5658a2-bf9e-4807-8e4b-68347db78e24"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>High-dimensional quantum communication over deployed fiber</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2018</PublicationDate> <Authors> <Author> <DisplayName>Lee, Catherine, Ph. D. Massachusetts Institute of Technology</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Electrical Engineering and Computer Science.</Keyword> <Abstract>Quantum key distribution (QKD) exploits the inherent strangeness of quantum mechanics to improve secure communication, enabling two pre-authenticated participants to establish symmetric encryption keys over long distances, without making any assumptions about the computational abilities of an adversary. QKD commonly relies on the transmission and detection of single photons to distribute the secret keys, but the secret-key generation rates are often limited by hardware, namely the ability to produce or detect nonclassical states of light. We address this challenge by using high-dimensional encoding to increase the secure information yield per detected photon. In this thesis, we present security analysis for and the first demonstrations of a resource-efficient high-dimensional QKD protocol, including two varieties of implementation that each have different strengths and weaknesses. We introduce a 42-km deployed fiber testbed that we use to demonstrate our high-dimensional QKD protocol. We also demonstrate the violation of a steering inequality, confirming that we can produce entanglement in the lab and distribute it over the deployed fiber. By these experiments, we demonstrate both the utility of our high-dimensional QKD protocol and the feasibility of our testbed for further applications in quantum communication and networking.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>