| Decoherence, Entanglement and Information Protection in Complex Quantum Systems: Proceedings of the NATO Arw on Decoherence, Entanglement and Informat 2005 Edition Contributor(s): Akulin, Vladimir M. (Editor), Sarfati, A. (Editor), Kurizki, G. (Editor) |
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ISBN: 140203282X ISBN-13: 9781402032820 Publisher: Springer OUR PRICE: $161.49 Product Type: Paperback - Other Formats Published: August 2005 Annotation: This book is a collection of articles on the contemporary status of quantum mechanics, dedicated to the fundamental issues of entanglement, decoherence, irreversibility, information processing, and control of quantum evolution, with a view of possible applications. It has multidisciplinary character and is addressed at a broad readership in physics, computer science, chemistry, and electrical engineering. It is written by the world-leading experts in pertinent fields such as quantum computing, atomic, molecular and optical physics, condensed matter physics, and statistical physics. |
| Additional Information |
| BISAC Categories: - Science | Waves & Wave Mechanics - Science | Physics - Quantum Theory - Science | Physics - Optics & Light |
| Dewey: 530.12 |
| Series: NATO Science Series II: |
| Physical Information: 1.43" H x 6.14" W x 9.21" (2.17 lbs) 704 pages |
| Descriptions, Reviews, Etc. |
| Publisher Description: Dynamics of an open system interacting with theenvironment considered as a thermostate may be formulatedin terms of a master equation with an integral operator allowing for the relaxation process, Zwanzig 1960]. In some part- ular cases this operator hasashort-lastingkernel that enables one to consider therelaxation as a Markovian process and to obtainthe master equation inthe Lindblad form, Lindblad 1976 (a)]. In some situations the memory effects become, however, important and the dynamics of thesystem gets much more involved, Barnett 2001]. A similar situation arises inthe case where a set of consecutive or continuous measurements is performed. The purpose of this article is to consider a situation where some simplification of the generalform of the master equation with memory isstill possibleand the result isasimpler master equation. In particular, we consider the case of a dynamic system c- pled to a measured ancilla via a nondemolition interaction, Caves 1980]. This simplifies the consideration essentiallywhereas providing an important special case inwhich the energy of the dynamic part is conserved. We consider a composite quantum system consisting of a dynamic part - teracting with an ancillary part, the latter being subject to repeated projective measurements. The entire quantum system is assumed to evolve unitarily d- ing time ? t between the measurements. As a specific example, we analyze a harmonic oscillator coupledtoatwo-level ancillathat issubject to measu- ments. |