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Quantum dynamical decoupling is a procedure to cancel the effective couplingbetween two systems by applying sequences of fast actuations, under which thecoupling Hamiltonian averages out to leading order(s). One of its prominentuses is to drive a target system in such a way as to decouple it from a lessprotected one. The present manuscript investigates the dual strategy: acting ona noisy "environment" subsystem such as to decouple it from a target system.The potential advantages are that actions on the environment commute withsystem operations, and that imprecisions in the decoupling actuation areharmless to the target. We consider two versions of environment-sidedecoupling: adding an imprecise Hamiltonian drive which stirs the environmentcomponents; and, increasing the decoherence rates on the environment. Thelatter can be viewed as driving the environment with pure noise and ourconclusions establish how, maybe counterintuitively, isolating the environmentfrom noise sources as much as possible is often not the best option. Weexplicitly analyze the induced decoherence on the target system and establishhow it is influenced by the parameters in both cases. The analysis combinesLindbladian derivation, adiabatic elimination, and Floquet modeling in a waythat may be of independent interest.

Quantum dynamical decoupling by shaking the close environment