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

摘要: We investigate the use of continuously applied external fields to maximize fidelity quantum logic operations performed on a decohering qubit. Assuming known error operator and an environment represented by scalar boson field at finite temperature, we show how decoherence during logical can be efficiently reduced applying superposition two vector fields: one rotating orthogonally direction other, which remains static. The required directions, frequency rotation, amplitudes decouple noise dynamically are determined coupling constants desired operation. illustrate these findings numerically for Hadamard gate with ohmic spectral density.