  In this paper, we give a mechanism for controlling speedup of a single-qubit
open quantum system by exclusively manipulating the system-reservoir bound
states using additional non-interacting qubits. It is demonstrated that
providing stronger bound states in the system-reservoir spectrum makes the
single-qubit evolution with higher speed. We examine the performance of the
mechanism for different spectral densities such as Lorentzian and Ohmic and
find out the decisive role of bound states manipulation in speeding up of
quantum evolution.
