Abstract We propose a strategy to modulate the decoherence dynamics of two-level system, which interacts with dissipative bosonic environment, by introducing an ancillary degree freedom. It is revealed that decay rate system can be significantly suppressed under suitable steers assisted Our result provides alternative way fight against and realize controllable quantum dynamics.

We consider a nonlinearly coupled electromechanical system, and develop quantitative theory for two-phonon cooling. In the presence of cooling, mechanical Hilbert space is effectively reduced to its ground first excited states, allowing quantum operations at level individual phonons preparing nonclassical states with negative Wigner functions. propose scheme performing arbitrary Bloch sphere ro...