Basilewitsch_2019_New_J._Phys._21_093054.pdf (1.38 MB)
Download file

Reservoir engineering using quantum optimal control for qubit reset

Download (1.38 MB)
journal contribution
posted on 26.09.2019, 10:42 by Daniel Basilewitsch, Francesco Cosco, Nicolino Lo Gullo, Mikko Möttönen, Tapio Ala-NissilaTapio Ala-Nissila, Christiane P Koch, Sabrina Maniscalco
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.

Funding

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

National Science Foundation under Grant No. NSF PHY-1748958

European Research Council Grant No. 681311 (QUESS)

History

School

  • Science

Department

  • Mathematical Sciences

Published in

New Journal of Physics

Volume

21

Issue

9

Publisher

IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft

Version

VoR (Version of Record)

Rights holder

© The Authors

Acceptance date

05/09/2019

Publication date

2019-09-24

Copyright date

2019

eISSN

1367-2630

Language

en

Depositor

Prof Tapio Ala-Nissila

Article number

093054