On dissipationless decoherence

Gangopadhyay, Gautam ; Kumar, M. Sanjay ; Dattagupta, Sushanta (2001) On dissipationless decoherence Journal of Physics A: Mathematical and General, 34 (27). pp. 5485-5495. ISSN 0305-4470

Full text not available from this repository.

Official URL: http://iopscience.iop.org/0305-4470/34/27/302?from...

Related URL: http://dx.doi.org/10.1088/0305-4470/34/27/302


We consider a model of environment-induced dissipationless decoherence of a quantum system where the system is coupled to the bath degrees of freedom via the system Hamiltonian itself. We solve exactly for the reduced density operator of the system for an arbitrary spectral density of the thermal bath and also write down an exact master equation in the Lindblad form. We compare and contrast the above results with those obtained by considering the system frequencies to be randomly modulated as in stochastic models. We observe that a coupling to the bath as above necessarily induces a Kerr-like coherent contribution in the reduced dynamics of the system. This Kerr-like term is a reflection of the quantum nature of the bath and cannot be obtained from stochastic models. For the special case of a harmonic oscillator we consider the influence of decoherence and its relation with phase diffusion. Our numerical results exhibit oscillations in the evolution of system variables which overall is a signature of the quantum nature of the environment.

Item Type:Article
Source:Copyright of this article belongs to Institute of Physics Publishing.
ID Code:9203
Deposited On:29 Oct 2010 11:23
Last Modified:08 Feb 2011 08:25

Repository Staff Only: item control page