Rotating wave approximation and entropy
This Letter studies composite quantum systems, like atom-cavity systems and coupled optical resonators, in the absence of external driving by resorting to methods from quantum field theory. Going beyond the rotating wave approximation, it is shown that the usually neglected counter-rotating part of...
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| Veröffentlicht in: | Physics letters. A 2010-08, Vol.374 (36), p.3726-3732 |
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| container_end_page | 3732 |
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| container_issue | 36 |
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| container_title | Physics letters. A |
| container_volume | 374 |
| creator | Kurcz, Andreas Capolupo, Antonio Beige, Almut Del Giudice, Emilio Vitiello, Giuseppe |
| description | This Letter studies composite quantum systems, like atom-cavity systems and coupled optical resonators, in the absence of external driving by resorting to methods from quantum field theory. Going beyond the rotating wave approximation, it is shown that the usually neglected counter-rotating part of the Hamiltonian relates to the entropy operator and generates an irreversible time evolution. The vacuum state of the system is shown to evolve into a generalized coherent state exhibiting entanglement of the modes in which the counter-rotating terms are expressed. Possible consequences at observational level in quantum optics experiments are currently under study. |
| doi_str_mv | 10.1016/j.physleta.2010.07.032 |
| format | Article |
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| ispartof | Physics letters. A, 2010-08, Vol.374 (36), p.3726-3732 |
| issn | 0375-9601 1873-2429 |
| language | eng |
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| source | Access via ScienceDirect (Elsevier) |
| subjects | Approximation Coherence Entropy Entropy thermodynamics Evolution Mathematical analysis Operators Optical resonators Quantized fields Quantum optics Rotating Rotating wave approximation Solid state physics |
| title | Rotating wave approximation and entropy |
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