Robust control of decoherence in realistic one-qubit quantum gates

Details Robust control of decoherence in realistic one-qubit quantum gates Robust control of decoherence in realistic one-qubit quantum gates

2002-02-25

arxiv.org/abs/quant-ph/0202141v2

Journal of Physics A, 36(8), 2175, 2003

Physics

Quantum Physics

21 pages, 8 figures, VIth International Conference on Quantum Communication, Measurement and Computing (Boston, 2002)

Scientific paper

10.1088/0305-4470/36/8/314

We present an open loop (bang-bang) scheme to control decoherence in a generic one-qubit quantum gate and implement it in a realistic simulation. The system is consistently described within the spin-boson model, with interactions accounting for both adiabatic and thermal decoherence. The external control is included from the beginning in the Hamiltonian as an independent interaction term. After tracing out the environment modes, reduced equations are obtained for the two-level system in which the effects of both decoherence and external control appear explicitly. The controls are determined exactly from the condition to eliminate decoherence, i.e. to restore unitarity. Numerical simulations show excellent performance and robustness of the proposed control scheme.

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