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Quantum Nanophotonics: Deterministic Photon-Based Quantum Logic Gate By Exploiting Few-Photon Nonlinearity, Zihao Chen
Quantum Nanophotonics: Deterministic Photon-Based Quantum Logic Gate By Exploiting Few-Photon Nonlinearity, Zihao Chen
McKelvey School of Engineering Theses & Dissertations
Photon-based quantum logic gate has substantial advantages over conventional atom-based designs as a result of a longer coherence time and an inherent compatibility with quantum communication protocol of flying qubits, photons. As a vital logic gate for universal quantum computing, the two-photon controlled-phase gate demands a few-photon nonlinearity, which historically suffers from either an indeterministic nature in the linear optics regime, or a weak nonlinearity within naturally-occurring materials in the nonlinear optics regime. It is intriguing yet challenging to deliver a logic gate design by exploiting a genuine fewphoton nonlinearity. In this dissertation, we study a particular one-dimensional quantum nanophotonic …
Possible Schemes For A Single Photon Switch, Hemlin Swaran Rag
Possible Schemes For A Single Photon Switch, Hemlin Swaran Rag
Graduate Theses and Dissertations
I consider the effectiveness of a single control photon to route a target photon using two processes: the first one uses the transient excitation of a two-level system and the second one which uses the permanent population transfer in a three-level Λ-system to route the target photon. In the absence of a single control photon and when the system has additional decay channels, I find ways to optimize the success probability of routing with an increasing number of photons in the control field.