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Title:Spatial mode control and advanced methods for multi-platform quantum communication
Author(s):Hill, Alexander D.
Director of Research:Kwiat, Paul G.
Doctoral Committee Chair(s):Lorenz, Virginia O.
Doctoral Committee Member(s):Stack, John; Peng, Jen-Chieh
Department / Program:Physics
Discipline:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Quantum Communication, Quantum Optics, Adaptive Optics
Abstract: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.
Issue Date:2018-08-30
Type:Text
URI:http://hdl.handle.net/2142/102394
Rights Information:Copyright 2018 Alexander Hill
Date Available in IDEALS:2019-02-06
Date Deposited:2018-12


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