dorsal/arxiv
View SchemaQubit Decoherence and Non-Markovian Dynamics at Low Temperatures via an Effective Spin-Boson Model
| Authors | K. Shiokawa, B. L. Hu |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0405147 |
| URL | https://arxiv.org/abs/quant-ph/0405147 |
| DOI | 10.1103/PhysRevA.70.062106 |
Abstract
Quantum Brownian oscillator model (QBM), in the Fock-space representation, can be viewed as a multi-level spin-boson model. At sufficiently low temperature, the oscillator degrees of freedom are dynamically reduced to the lowest two levels and the system behaves effectively as a two-level (E2L) spin-boson model (SBM) in this limit. We discuss the physical mechanism of level reduction and analyze the behavior of E2L-SBM from the QBM solutions. The availability of close solutions for the QBM enables us to study the non-Markovian features of decoherence and leakage in a SBM in the non-perturbative regime (e.g. without invoking the Born approximation) in better details than before. Our result captures very well the characteristic non-Markovian short time low temperature behavior common in many models.
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"abstract": "Quantum Brownian oscillator model (QBM), in the Fock-space representation,\ncan be viewed as a multi-level spin-boson model. At sufficiently low\ntemperature, the oscillator degrees of freedom are dynamically reduced to the\nlowest two levels and the system behaves effectively as a two-level (E2L)\nspin-boson model (SBM) in this limit. We discuss the physical mechanism of\nlevel reduction and analyze the behavior of E2L-SBM from the QBM solutions. The\navailability of close solutions for the QBM enables us to study the\nnon-Markovian features of decoherence and leakage in a SBM in the\nnon-perturbative regime (e.g. without invoking the Born approximation) in\nbetter details than before. Our result captures very well the characteristic\nnon-Markovian short time low temperature behavior common in many models.",
"arxiv_id": "quant-ph/0405147",
"authors": [
"K. Shiokawa",
"B. L. Hu"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.70.062106",
"title": "Qubit Decoherence and Non-Markovian Dynamics at Low Temperatures via an Effective Spin-Boson Model",
"url": "https://arxiv.org/abs/quant-ph/0405147"
},
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