Volume 85, Number 5, March 2009
|Number of page(s)||5|
|Published online||19 March 2009|
Quantum chaotic system as a model of decohering environment
Max-Planck Institute for the Physics of Complex Systems - Nöthnitzerstr. 38, D-01187 Dresden, Germany, EU
Accepted: 11 February 2009
As a model of decohering environment, we show that a quantum chaotic system behaves equivalently as a many-body system. An approximate formula for the time evolution of the reduced density matrix of a system interacting with a quantum chaotic environment is derived. This theoretical formulation is substantiated by the numerical study of the decoherence of two qubits interacting with a quantum chaotic environment modeled by a chaotic kicked top. Like the many-body model of environment, the quantum chaotic system is an efficient decoherer, and it can generate entanglement between the two qubits which have no direct interaction.
PACS: 05.45.Mt – Quantum chaos; semiclassical methods / 03.65.Yz – Decoherence; open systems; quantum statistical methods / 03.67.-a – Quantum information
© EPLA, 2009
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