Titlebook: Quantum Computation and Information; From Theory to Exper Hiroshi Imai,Masahito Hayashi Book 2006 Springer-Verlag Berlin Heidelberg 2006 Ad

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0303-4216 information.Recently, the field of quantum computation and information has been developing through a fusion of results from various research fields in theoretical and practical areas. This book consists of the reviews of selected topics charterized by great progress and cover the field from theoret

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Quantum Key Distribution: Security, Feasibility and Robustnessh a traditional laser device through the decoy-state method, i.e., changing the intensity of each pulse randomly among three values. One can improve the key rate and noise threshold if the channel noise is asymmetric. One can also do QKD more robustly with a two-qubit quantum code given that the channel noise is collective or independent.

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Quantum Key Distribution: Security, Feasibility and Robustnessth proven security. We study various QKD protocols with special emphasis on security, feasibility and robustness. The security proof of the standard four-state protocol can be done based on the virtual entanglement purification by classical hashing. QKD can be done with unconditional security even w

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Photonic Realization of Quantum Information Systemsg on a single qubit. Quantum key distribution systems using improved photon detectors have been developed for commercial products in two directions: longer distances and high speeds. A photonic circuit has demonstrated the quantum Fourier transform operation over 1024 qubit. Entangled photon genarat

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Photonic Realization of Quantum Information Systemsonger distances and high speeds. A photonic circuit has demonstrated the quantum Fourier transform operation over 1024 qubit. Entangled photon genaration in spontaneous parametric down conversion has been also improved.

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Book 2006l and practical areas. This book consists of the reviews of selected topics charterized by great progress and cover the field from theoretical areas to experimental ones. It contains fundamental areas, quantum query complexity, quantum statistical inference, quantum cloning, quantum entanglement, ad