Two-Level Atom at Finite Temperature

• Authors: T. Sowiński
• Languages of publication: EN

Abstracts

EN

Properties of a two-level atom coupled to the quantized electromagnetic field at finite temperature are determined. The analysis is based on a new method (inspired by quantum electrodynamics) of describing qubits, developed previously at zero temperature. In this paper, we make a generalization to finite temperature by introducing the Matsubara formalism and the temperature propagators. We analyze the spectral properties of different types of propagators and we derive a direct connection between the temperature propagators and the real time propagators. To show the effectiveness of this method, we calculate the temperature dependence of the polarizability of a two-level atom in the lowest order of perturbation theory and we predict an unexpected sharpening of the resonance. The whole discussion is carried out without the rotating wave approximation.

Keywords

EN

11.10.Wx; 32.10.Dk; 31.15.ap; 32.70.Jz

Discipline

• 32.10.Dk: Electric and magnetic moments, polarizabilities
• 11.10.Wx: Finite-temperature field theory
• 32.70.Jz: Line shapes, widths, and shifts
• 31.15.ap: Polarizabilities and other atomic and molecular properties

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 116
• Issue: 6
• Pages: 994-1005

Dates

published

2009-12

received

2009-10-26

Contributors

author

T. Sowiński

• Center for Theoretical Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
• Faculty of Biology and Environmental Sciences, Cardinal Stefan Wyszynski University, Wóycickiego 1/3, 01-938 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.116.994