http://hdl.handle.net/2160/2972 2013-06-18T23:10:58Z 2013-06-18T23:10:58Z Koestler, Claus http://hdl.handle.net/2160/13768 2013-05-10T15:54:50Z 2010-12-08T00:00:00Z

Symmetry and Independence in Quantum Probability Koestler, Claus numberexhibits: 1

2010-12-08T00:00:00Z Burgarth, Daniel Giovannetti, Vittorio http://hdl.handle.net/2160/13140 2013-05-10T15:31:22Z 2011-09-27T00:00:00Z

A Protocol For Cooling and Controlling Composite Systems by Local Interactions Burgarth, Daniel; Giovannetti, Vittorio Ericsson, Marie; Montangero, Simone We discuss an explicit protocol which allows one to externally cool and control a composite system by operating on a small subset of it. The scheme permits to transfer arbitrary and unknown quantum states from a memory on the network ('upload access') as well as the inverse ('download access'). In particular it yields a method for cooling the system. D. Burgarth, V. Giovannetti, A Protocol For Cooling and Controlling Composite Systems by Local Interactions, in 'Quantum Information and Many Body Quantum Systems', proceedings, M. Ericsson and S. Montangero (eds.), Pisa, Edizioni della Normale, p. 17 (2008)

2011-09-27T00:00:00Z Gough, John E. James, Matthew R. http://hdl.handle.net/2160/13093 2013-05-10T15:29:37Z 2008-12-09T00:00:00Z

Quantum Behaviors and Networks Gough, John E.; James, Matthew R. The purpose of this paper is to discuss how Willems’ behavioral modeling might be applied to physical systems governed by the laws of quantum physics. A quantum behavior is simply defined in terms of the evolution of physical variables according to quantum mechanics. This evolution is determined by parameters that specify the internal energy of the system, and any interfaces to other systems or fields. A simple framework for modeling open quantum systems and networks of such systems is described; this framework provides tools for determining quantum behaviors. The ideas are illustrated by an example from quantum optics. Decision and Control, 2008. CDC 2008. 47th IEEE Conference on Publication Date: 9-11 Dec. 2008 On page(s): 4552-4557 Location: Cancun, ISSN: 0191-2216 ISBN: 978-1-4244-3123-6 Digital Object Identifier: 10.1109/CDC.2008.4738928

2008-12-09T00:00:00Z Gough, John E. http://hdl.handle.net/2160/12944 2013-05-10T15:23:46Z 2008-11-12T00:00:00Z

Optimal Quantum Feedback Control for Canonical Observables Gough, John E. We consider the problem of optimal feedback control of a quantum system with linear dynamics undergoing continual non-demolition measurement of position and/or momentum, or both together. Specically, we show that a stable domain of solutions for the ltered state of the system will be given by a class of randomized squeezed states and we exercise the control problem amonst these states. Bellman's principle is then applied directly to optimal feedback control of such dynamical systems and the Hamilton Jacobi Bellman equation for the minimum cost is derived. The situation of quadratic performance criteria is treated as the important special case and solved exactly for the class of relaxed states. John Gough, in Quantum Stochastics and Information: Statistics, Filtering & Control, pp. 262-279 Eds. M. Guta and V.P. Belavkin, World Scientific 2008 ISBN#: 9789812832955

2008-11-12T00:00:00Z