A1 Refereed original research article in a scientific journal
Reservoir engineering using quantum optimal control for qubit reset
Authors: Basilewitsch D, Cosco F, Lo Gullo N, Mottonen M, Ala-Nissila T, Koch CP, Maniscalco S
Publisher: IOP PUBLISHING LTD
Publishing place: BRISTOL
Publication year: 2019
Journal: New Journal of Physics
Journal name in source: NEW JOURNAL OF PHYSICS
Journal acronym: NEW J PHYS
Article number: ARTN 093054
Volume: 21
Number of pages: 12
ISSN: 1367-2630
eISSN: 1367-2630
DOI: https://doi.org/10.1088/1367-2630/ab41ad
Web address : 10.1088/1367-2630/ab41ad
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/42664409
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 time-local master equation with time-dependent 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. Time-dependent level splittings imply a modification of the system-environment 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 non-adiabatic population transfer into this strongly decaying state.
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