Lower limit on decoherence introduced by entangling two spatially-separated qubits

Details Lower limit on decoherence introduced by entangling two spatially-separated qubits Lower limit on decoherence introduced by entangling two spatially-separated qubits

2002-11-29

arxiv.org/abs/quant-ph/0211200v1

Physics

Quantum Physics

4 pages, RevTex4 macros, no figures

Scientific paper

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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