dorsal/arxiv
View SchemaSemiclassical Theory of Coherence and Decoherence
| Authors | Gregory A. Fiete, Eric J. Heller |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0211184 |
| URL | https://arxiv.org/abs/quant-ph/0211184 |
| DOI | 10.1103/PhysRevA.68.022112 |
| Journal | Phys. Rev. A 68, 022112 (2003) |
Abstract
A general semiclassical approach to quantum systems with system-bath interactions is developed. We study system decoherence in detail using a coherent state semiclassical wavepacket method which avoids singularity issues arising in the usual Green's function approach. We discuss the general conditions under which it is approximately correct to discuss quantum decoherence in terms of a ``dephasing'' picture and we derive semiclassical expressions for the phase and phase distribution. Remarkably, an effective system wavefunction emerges whose norm measures the decoherence and is equivalent to a density matrix formulation.
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"abstract": "A general semiclassical approach to quantum systems with system-bath\ninteractions is developed. We study system decoherence in detail using a\ncoherent state semiclassical wavepacket method which avoids singularity issues\narising in the usual Green\u0027s function approach. We discuss the general\nconditions under which it is approximately correct to discuss quantum\ndecoherence in terms of a ``dephasing\u0027\u0027 picture and we derive semiclassical\nexpressions for the phase and phase distribution. Remarkably, an effective\nsystem wavefunction emerges whose norm measures the decoherence and is\nequivalent to a density matrix formulation.",
"arxiv_id": "quant-ph/0211184",
"authors": [
"Gregory A. Fiete",
"Eric J. Heller"
],
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"quant-ph",
"cond-mat.mes-hall"
],
"doi": "10.1103/PhysRevA.68.022112",
"journal_ref": "Phys. Rev. A 68, 022112 (2003)",
"title": "Semiclassical Theory of Coherence and Decoherence",
"url": "https://arxiv.org/abs/quant-ph/0211184"
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