Coherent-state qubits: entanglement and decoherence |
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| Authors: | Email author" target="_blank">J?K?AsbóthEmail author P?Adam M?Koniorczyk J?Janszky |
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| Institution: | (1) Institut für Theoretische Physik, Universität Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria;(2) Research Institute for Solid State Physics and Optics, P.O. Box 49, 1525 Budapest, Hungary;(3) Research Group for Nonlinear and Quantum Optics, Hungarian Academy of Sciences and Institute of Physics, University of Pécs, Ifjúság út 6, 7624 Pécs, Hungary;(4) Research Centre for Quantum Information, Institute of Physics, Slovak Academy of Sciences, 845 11 Dubravská cesta 9, Bratislava Slovakia |
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| Abstract: | Arbitrary superpositions of any two optical coherent states are investigated as realizations of qubits for quantum information processing. Decoherence of these coherent-state qubits is described in detail, and visualized using a suitable adaptive Bloch-sphere. The entanglement that can be created by a beam splitter from these states is quantified, and its decoherence behavior is analyzed.Received: 13 May 2004, Published online: 10 August 2004PACS:
42.50.Dv Nonclassical states of the electromagnetic field, including entangled photon states; quantum state engineering and measurements - 03.65.Ud Entanglement and quantum nonlocality (e.g. EPR paradox, Bell s inequalities, GHZ states, etc.) - 03.67.-a Quantum information |
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