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Non-Markovian decay and decoherence in open quantum systems
KTH, School of Engineering Sciences (SCI), Physics.
2005 (English)In: Decoherence, Entanglement and Information Protection in Complex Quantum Systems / [ed] Akulin, VM; Sarfati, A; Kurizki, G; Pellegrin, S, DORDRECHT: SPRINGER , 2005, Vol. 189, 235-238 p.Conference paper (Refereed)
Abstract [en]

Interaction between a quantum system and its surroundings - be it another similar quantum system, a thermal reservoir, or a measurement device - breaks down the standard unitary evolution of the system alone and introduces open quantum system behaviour. Coupling to a fast-relaxing thermal reservoir is known to lead to an exponential decay of the quantum state, a process described by a Lindblad-type master equation. In modem quantum physics, however, near isolation of individual quantum objects, such as qubits, atoms, or ions, sometimes allow them only to interact with a slowly-relaxing near-environment, and the consequent decay of the atomic quantum state may become nonexponential and possibly even nonmonotonic. Here we consider different descriptions of non-Markovian evolutions and also hazards associated with them, as well as some physical situations in which the environment of a quantum system induces non-Markovian phenomena.

Place, publisher, year, edition, pages
DORDRECHT: SPRINGER , 2005. Vol. 189, 235-238 p.
Keyword [en]
irreversible time evolution, master equation, non-exponential decay
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-43256ISI: 000234793100017ISBN: 1-4020-3281-1OAI: diva2:448755
NATO Advanced Research Workshop on Decoherence, Entanglement and Information Protection in Complex Quantum Systems Location: Les Houches, FRANCE Date: APR 26-JUN 30, 2004
QC 20111018Available from: 2011-10-18 Created: 2011-10-14 Last updated: 2011-10-18Bibliographically approved

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