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oai:www.ideals.illinois.edu:2142/102394 2023-07-11 col_2142_5131 col_2142_8859 com_2142_5130 com_2142_8858 com_2142_234

Kwiat, Paul G. Lorenz, Virginia O. Stack, John Peng, Jen-Chieh Hill, Alexander D. 2019-02-06T19:32:39Z 2019-02-06T19:32:39Z 2018-08-30 2018-12 Though state-of-the-art quantum computers are currently limited to only a handful of physical qubits, a quantum computer large enough to perform prime factorization of modern cryptographic keys, quantum simulation, and quantum-enhanced searching algorithms will likely become viable within a few decades. Such computers demand communication networks that preserve the qualities of the quantum states used as inputs and outputs; they also herald the end of the flavors of classical cryptography reliant on the complexity of factoring large numbers. As a result, future networks must include channels which preserve the states of single photons over useful distances (e.g., using quantum repeaters), and must deploy quantum-safe cryptography to ensure the safety of classical information passing over the network. Here we discuss strategies affecting several areas of a future quantum-enabled network: first, we demonstrate a technique for adaptively coupling single photons from point sources into single-mode optical fiber and apply the technique to coupling from quantum dots (a popular candidate for a future quantum repeater); secondly, we discuss various methods for simulating the effects of atmospheric turbulence on quantum cryptographic protocols in the laboratory, critical for understand the challenges facing free-space implementations of quantum communication. Thirdly, we demonstrate a technique that enables quantum cryptographic networks over free space channels to function in the presence of strong atmospheric turbulence using a multi-aperture receiver. Finally, we discuss our efforts to miniaturize a quantum key distribution system and operate a key distribution channel between flying multirotor drones. Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2019-02-05 without embargo terms The student, Alexander Hill, accepted the attached license on 2018-08-29 at 15:39. The student, Alexander Hill, submitted this Dissertation for approval on 2018-08-29 at 16:55. This Dissertation was approved for publication on 2018-08-30 at 13:49. DSpace SAF Submission Ingestion Package generated from Vireo submission #12986 on 2019-02-05 at 11:07:40 Made available in DSpace on 2019-02-06T19:32:39Z (GMT). No. of bitstreams: 2 HILL-DISSERTATION-2018.pdf: 20575132 bytes, checksum: cfe403b9c7f44790e042c8c54cc1d788 (MD5) LICENSE.txt: 4211 bytes, checksum: d9565983780dd432584587dd5c0170e4 (MD5) Previous issue date: 2018-08-30 application/pdf http://hdl.handle.net/2142/102394 en Copyright 2018 Alexander Hill Quantum Communication, Quantum Optics, Adaptive Optics Spatial mode control and advanced methods for multi-platform quantum communication text text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.