Decoherence control in quantum information processing: simple models

Details Decoherence control in quantum information processing: simple models Decoherence control in quantum information processing: simple models

1998-09-19

arxiv.org/abs/quant-ph/9809058v1

Physics

Quantum Physics

7 pages, 2 figures; RevTeX style. Invited talk at the 4th International Conference on Quantum Communication, Measurement & Com

Scientific paper

We explore a strategy for protecting the evolution of a qubit against the effects of environmental noise based on the application of controlled time-dependent perturbations. In the case of a purely decohering coupling, an explicit sequence of control operations is designed, able to average out the decoherence of the qubit with high efficiency. We argue that, in principle, the effects of arbitrary qubit-environment interactions can be removed through suitable decoupling perturbations acting on the system dynamics over time scales comparable to the correlation time of the environment.

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