Towards Scalable Linear-Optical Quantum Computers |
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| Authors: | J P Dowling J D Franson H Lee G J Milburn |
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| Affiliation: | (1) Quantum Computing Technologies Group, Section 367, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, MS, CA 91109, USA;(2) Department of Physics, Louisiana State University, Baton Rouge, LA 70803, USA;(3) Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723, USA;(4) Centre for Quantum Computer Technology, University of Queensland, QLD, 4072, Australia |
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| Abstract: | Scalable quantum computation with linear optics was considered to be impossible due to the lack of efficient two-qubit logic gates, despite the ease of implementation of one-qubit gates. Two-qubit gates necessarily need a non-linear interaction between the two photons, and the efficiency of this non-linear interaction is typically very small in bulk materials. However, it has recently been shown that this barrier can be circumvented with effective non-linearities produced by projective measurements, and with this work linear-optical quantum computing becomes a new avenue towards scalable quantum computation. We review several issues concerning the principles and requirements of this scheme.
PACS: 03.67.Lx, 03.67.Pp, 42.50.Dv, 42.65.Lm |
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| Keywords: | Linear optics Logic gates Single photon Quantum memory Quantum repeater |
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