  One of the important issues in developing quantum technology is noise as
quantum states are extremely sensitive to it. We propose a physical protocol
which introduces reverse dynamics, in order to precisely control an open
quantum system against noise. The reverse dynamics is realised by applying a
well-controlled Hamiltonian and jump-operators. The control parameters for the
Hamiltonian and jump operators are formulated by the Petz recovery map in
continuous-time, from which we reverse the noisy quantum dynamics. The
time-dependent jump operators can be implemented by considering strongly
decaying ancillary qubits which interact with the system in a controlled
manner. As a specific application, we demonstrate that our protocol efficiently
suppresses only the noise part of dynamics thereby providing an effective
unitary evolution of the quantum system.
