Modified Bloch equations in the presence of a nonstationary bath
Indian Association for the Cultivation of Science,
Jadavpur, Calcutta 700032, India
Revised: 21 January 1999
Published online: 15 June 1999
Based on the system-reservoir description, we propose a simple solvable microscopic model for a nonequilibrium bath. This captures the essential features of a nonstationary quantum Markov process. We establish an appropriate generalization of the fluctuation-dissipation relation pertaining to this process and explore the essential modifications of the Bloch equations to reveal the nonexponential decay of the Bloch vector components and transient spectral broadening in resonance fluorescence. We discuss a simple experimental scheme to verify the theoretical results.
PACS: 32.80.-t – Photon interactions with atoms / 42.65.An – Optical susceptibility, hyperpolarizability
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999