Reservoir Engineering using Quantum Optimal Control for Qubit Reset
Abstract
We determine how to optimally reset a superconducting qubit which interacts with a thermal environment in such a way that the coupling strength is tunable. Describing the system in terms of a timelocal master equation with timedependent decay rates and using quantum optimal control theory, we identify temporal shapes of tunable level splittings which maximize the efficiency of the reset protocol in terms of duration and error. Timedependent level splittings imply a modification of the systemenvironment coupling, varying the decay rates as well as the Lindblad operators. Our approach thus demonstrates efficient reservoir engineering employing quantum optimal control. We find the optimized reset strategy to consist in maximizing the decay rate from one state and driving nonadiabatic population transfer into this strongly decaying state.
 Publication:

arXiv eprints
 Pub Date:
 March 2019
 arXiv:
 arXiv:1903.05059
 Bibcode:
 2019arXiv190305059B
 Keywords:

 Quantum Physics
 EPrint:
 11 pages, 5 figures