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We investigate the use of continuously-applied external fields to maximizethe fidelity of quantum logic operations performed on a decohering qubit.Assuming a known error operator and an environment represented by a scalarboson field at a finite temperature, we show how decoherence during logicaloperations can be efficiently reduced by applying a superposition of twoexternal vector fields: one rotating orthogonally to the direction of theother, which remains static. The required field directions, frequency ofrotation and amplitudes to decouple noise dynamically are determined by thecoupling constants and the desired logical operation. We illustrate thesefindings numerically for a Hadamard quantum gate and an environment with ohmicspectral density.Comment: 4 pages, 1 figur

Continuously decoupling single-qubit operations from a perturbing thermal bath of scalar bosons