dorsal/arxiv
View SchemaControlling decoherence of a two-level-atom in a lossy cavity
| Authors | M. Thorwart, L. Hartmann, I. Goychuk, P. Hänggi |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0003029 |
| URL | https://arxiv.org/abs/quant-ph/0003029 |
| DOI | 10.1080/09500340008232205 |
| Journal | J. Mod. Opt. 47, 2905 (2000) |
Abstract
By use of external periodic driving sources, we demonstrate the possibility of controlling the coherent as well as the decoherent dynamics of a two-level atom placed in a lossy cavity. The control of the coherent dynamics is elucidated for the phenomenon of coherent destruction of tunneling (CDT), i.e., the coherent dynamics of a driven two-level atom in a quantum superposition state can be brought practically to a complete standstill. We study this phenomenon for different initial preparations of the two-level atom. We then proceed to investigate the decoherence originating from the interaction of the two-level atom with a lossy cavity mode. The loss mechanism is described in terms of a microscopic model that couples the cavity mode to a bath of harmonic field modes. A suitably tuned external cw-laser field applied to the two-level atom slows down considerably the decoherence of the atom. We demonstrate the suppression of decoherence for two opposite initial preparations of the atomic state: a quantum superposition state as well as the ground state. These findings can be used to the effect of a proficient battling of decoherence in qubit manipulation processes.
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"abstract": "By use of external periodic driving sources, we demonstrate the possibility\nof controlling the coherent as well as the decoherent dynamics of a two-level\natom placed in a lossy cavity.\n The control of the coherent dynamics is elucidated for the phenomenon of\ncoherent destruction of tunneling (CDT), i.e., the coherent dynamics of a\ndriven two-level atom in a quantum superposition state can be brought\npractically to a complete standstill. We study this phenomenon for different\ninitial preparations of the two-level atom. We then proceed to investigate the\ndecoherence originating from the interaction of the two-level atom with a lossy\ncavity mode. The loss mechanism is described in terms of a microscopic model\nthat couples the cavity mode to a bath of harmonic field modes. A suitably\ntuned external cw-laser field applied to the two-level atom slows down\nconsiderably the decoherence of the atom. We demonstrate the suppression of\ndecoherence for two opposite initial preparations of the atomic state: a\nquantum superposition state as well as the ground state. These findings can be\nused to the effect of a proficient battling of decoherence in qubit\nmanipulation processes.",
"arxiv_id": "quant-ph/0003029",
"authors": [
"M. Thorwart",
"L. Hartmann",
"I. Goychuk",
"P. H\u00e4nggi"
],
"categories": [
"quant-ph"
],
"doi": "10.1080/09500340008232205",
"journal_ref": "J. Mod. Opt. 47, 2905 (2000)",
"title": "Controlling decoherence of a two-level-atom in a lossy cavity",
"url": "https://arxiv.org/abs/quant-ph/0003029"
},
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