Reservoir engineering using quantum optimal control for qubit reset

Daniel Basilewitsch, Francesco Cosco, Nicolino Lo Gullo, Mikko Möttönen, Tapio Ala-Nissilä, Christiane P. Koch (Corresponding Author), Sabrina Maniscalco

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)


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.

Original languageEnglish
Article number093054
JournalNew Journal of Physics
Issue number9
Publication statusPublished - 24 Sept 2019
MoE publication typeA1 Journal article-refereed


Financial support from the Volkswagenstiftung, the DAAD, the Academy of Finland via the QTF Centre of Excellence program (projects 287750, 312058, 312298, and 312300)


  • Circuit QED
  • Quantum optimal control
  • Quantum reservoir engineering
  • Qubit initialization
  • Time-local master equation with time-dependent decay


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