dorsal/arxiv
View Schema"Shaking" of an atom in a non-stationary cavity
| Authors | A. M. Fedotov, N. B. Narozhny, Yu. E. Lozovik |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0008066 |
| URL | https://arxiv.org/abs/quant-ph/0008066 |
| DOI | 10.1016/S0375-9601(00)00542-9 |
| Journal | Physics Letters A274(5-6), 2000, pp.213-222 |
Abstract
We consider an atom interacting with a quantized electromagnetic field inside a cavity with variable parameters. The atom in the ground state located in the initially empty cavity can be excited by variation of cavity parameters. We have discovered two mechanisms of atomic excitation. The first arises due to the interaction of the atom with the non-stationary electromagnetic field created by modulation of cavity parameters. If the characteristic time of variation of cavity parameters is of the order of the atomic transition time, the processes of photon creation and atomic excitation are going on simultaneously and hence excitation of the atom cannot be reduced to trivial absorption of the photons produced by the dynamical Casimir effect. The second mechanism is "shaking" of the atom due to fast modulation of its ground state Lamb shift which takes place as a result of fast variation of cavity arameters. The last mechanism has no connection with the vacuum dynamical Casimir effect. Moreover, it opens a new channel of photon creation in the non-stationary cavity. Nevertheless, the process of photon creation is altered by the presence of the atom in the cavity, even if one disregards the existence of the new channel. In particular, it removes the restriction for creation of only even number of photons and also changes the expectation value for the number of created photons. Our consideration is based on a simple model of a two-level atom interacting with a single mode of the cavity field. Qualitatively our results are valid for a real atom in a physical cavity.
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"abstract": "We consider an atom interacting with a quantized electromagnetic field inside\na cavity with variable parameters. The atom in the ground state located in the\ninitially empty cavity can be excited by variation of cavity parameters. We\nhave discovered two mechanisms of atomic excitation. The first arises due to\nthe interaction of the atom with the non-stationary electromagnetic field\ncreated by modulation of cavity parameters. If the characteristic time of\nvariation of cavity parameters is of the order of the atomic transition time,\nthe processes of photon creation and atomic excitation are going on\nsimultaneously and hence excitation of the atom cannot be reduced to trivial\nabsorption of the photons produced by the dynamical Casimir effect. The second\nmechanism is \"shaking\" of the atom due to fast modulation of its ground state\nLamb shift which takes place as a result of fast variation of cavity arameters.\nThe last mechanism has no connection with the vacuum dynamical Casimir effect.\nMoreover, it opens a new channel of photon creation in the non-stationary\ncavity. Nevertheless, the process of photon creation is altered by the presence\nof the atom in the cavity, even if one disregards the existence of the new\nchannel. In particular, it removes the restriction for creation of only even\nnumber of photons and also changes the expectation value for the number of\ncreated photons. Our consideration is based on a simple model of a two-level\natom interacting with a single mode of the cavity field. Qualitatively our\nresults are valid for a real atom in a physical cavity.",
"arxiv_id": "quant-ph/0008066",
"authors": [
"A. M. Fedotov",
"N. B. Narozhny",
"Yu. E. Lozovik"
],
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"quant-ph"
],
"doi": "10.1016/S0375-9601(00)00542-9",
"journal_ref": "Physics Letters A274(5-6), 2000, pp.213-222",
"title": "\"Shaking\" of an atom in a non-stationary cavity",
"url": "https://arxiv.org/abs/quant-ph/0008066"
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