dorsal/arxiv
View SchemaDecoherence in a N-qubit solid-state quantum computer
| Authors | B. Ischi, M. Hilke, M. Dube |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0411086 |
| URL | https://arxiv.org/abs/quant-ph/0411086 |
| DOI | 10.1103/PhysRevB.71.195325 |
| Journal | Phys. Rev. B 71, 195325 (2005) |
Abstract
We investigate the decoherence process for a quantum register composed of N qubits coupled to an environment. We consider an environment composed of one common phonon bath and several electronic baths. This environment is relevant to the implementation of a charge based solid-state quantum computer. We explicitly compute the time evolution of all off-diagonal terms of the register's reduced density matrix. We find that in realistic configurations, "superdecoherence" and "decoherence free subspaces" do not exist for an N-qubit system. This means that all off-diagonal terms decay like exp(-q(t)N), where q(t) is of the same order as the decay function of a single qubit.
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"abstract": "We investigate the decoherence process for a quantum register composed of N\nqubits coupled to an environment. We consider an environment composed of one\ncommon phonon bath and several electronic baths. This environment is relevant\nto the implementation of a charge based solid-state quantum computer. We\nexplicitly compute the time evolution of all off-diagonal terms of the\nregister\u0027s reduced density matrix. We find that in realistic configurations,\n\"superdecoherence\" and \"decoherence free subspaces\" do not exist for an N-qubit\nsystem. This means that all off-diagonal terms decay like exp(-q(t)N), where\nq(t) is of the same order as the decay function of a single qubit.",
"arxiv_id": "quant-ph/0411086",
"authors": [
"B. Ischi",
"M. Hilke",
"M. Dube"
],
"categories": [
"quant-ph",
"cond-mat.mes-hall"
],
"doi": "10.1103/PhysRevB.71.195325",
"journal_ref": "Phys. Rev. B 71, 195325 (2005)",
"title": "Decoherence in a N-qubit solid-state quantum computer",
"url": "https://arxiv.org/abs/quant-ph/0411086"
},
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