dorsal/arxiv
View SchemaLower limit on decoherence introduced by entangling two spatially-separated qubits
| Authors | A. J. Fisher |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0211200 |
| URL | https://arxiv.org/abs/quant-ph/0211200 |
Abstract
It is shown that a generalization of the fluctuation-dissipation theorem places an upper bound on the figure of merit for any quantum gate designed to entangle spatially-separated qubits. The bound depends solely on the spectral properties of the environment. The bound applies even to systems performing a quantum computation within a decoherence-free subspace, but might be optimized by the use of non-equilibrium squeezed states of the environment, or by using an environment system constructed to have response confined to certain frequencies.
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"abstract": "It is shown that a generalization of the fluctuation-dissipation theorem\nplaces an upper bound on the figure of merit for any quantum gate designed to\nentangle spatially-separated qubits. The bound depends solely on the spectral\nproperties of the environment. The bound applies even to systems performing a\nquantum computation within a decoherence-free subspace, but might be optimized\nby the use of non-equilibrium squeezed states of the environment, or by using\nan environment system constructed to have response confined to certain\nfrequencies.",
"arxiv_id": "quant-ph/0211200",
"authors": [
"A. J. Fisher"
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"title": "Lower limit on decoherence introduced by entangling two spatially-separated qubits",
"url": "https://arxiv.org/abs/quant-ph/0211200"
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