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We present a method to accelerate the dynamical evolution of multiqubit opensystem by employing dynamical decoupling pulses (DDPs) when the qubits areinitially in W-type states. It is found that this speed-up evolution can beachieved in both of the weak-coupling regime and the strong-coupling regime.The physical mechanism behind the acceleration evolution is explained as theresult of the joint action of the non-Markovianity of reservoirs and theexcited-state population of qubits. It is shown that both of thenon-Markovianity and the excited-state population can be controlled by DDPs torealize the quantum speed-up.

Quantum speed-up of multiqubit open system via dynamical decoupling pulses