Quantum logic operations using linear optical elements
Links to Fileshttps://www.osapublishing.org/abstract.cfm?uri=NLO-2002-FA3
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Type of Work3 pages
conference papers and proceedings
Citation of Original PublicationJ. D. Franson, B. C. Jacobs, and T. B. Pittman, "Quantum logic operations using linear optical elements," in Nonlinear Optics: Materials, Fundamentals and Applications, A. Sawchuk, ed., Vol. 79 of OSA Trends in Optics and Photonics (Optical Society of America, 2002), paper FA3., https://doi.org/10.1364/NLO.2002.FA3
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Knill, Laflamme, and Milburn  have shown that probabilistic quantum logic operations can be implemented using linear optical elements, such as beam splitters and phase shifters, additional photons (ancilla) and post-selection based on the results of measurements on the ancilla. This may seem somewhat surprising, since logic operations are inherently nonlinear. Here the nonlinearity is produced by the quantum measurement process used in the post-selection. Nonlinearities of this kind are inherently quantum-mechanical and have no classical analogy.