Two-level atom at finite temperature
| dc.creator | Sowinski, Tomasz | |
| dc.date | 2009-01-21 | |
| dc.date | 2009-04-18 | |
| dc.date.accessioned | 2026-07-07T13:05:18Z | |
| dc.date.available | 2026-07-07T13:05:18Z | |
| dc.description | 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 QED) of describing qubits, developed previously at zero temperature (Phys. Rev. A 76, 062106 (2007)). 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. | |
| dc.description | 12 pages | |
| dc.identifier | https://arxiv.org/abs/0901.3268 | |
| dc.identifier | http://arxiv.org/abs/0901.3268 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/227449 | |
| dc.subject | Quantum Physics | |
| dc.title | Two-level atom at finite temperature | |
| dc.type | text |