Reservoir engineering using quantum optimal control for qubit reset

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 iden...

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Bibliographic Details
Published in:New journal of physics 2019-09, Vol.21 (9), p.93054
Main Authors: Basilewitsch, Daniel, Cosco, Francesco, Lo Gullo, Nicolino, Möttönen, Mikko, Ala-Nissilä, Tapio, Koch, Christiane P, Maniscalco, Sabrina
Format: Article
Language:English
Subjects:
circuit QED
Control theory
Coupling
Decay rate
Optimal control
Optimization
Physics
quantum optimal control
quantum reservoir engineering
qubit initialization
Qubits (quantum computing)
Reservoir engineering
Thermal environments
Time dependence
time-local master equation with time-dependent decay
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Summary: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.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ab41ad