Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 31: Poster: Quantum Optics and Photonics I
Q 31.46: Poster
Dienstag, 7. März 2017, 17:00–19:00, P OG1+2
Cooling and Reset of a Superconducting Qubit using Quantum Optimal Control — •Daniel Basilewitsch1, Rebecca Schmidt2, Sabrina Maniscalco2, Dominique Sugny3,4, and Christiane Koch1 — 1Theoretical Physics, University of Kassel, Kassel, Germany — 2Turku Center for Quantum Physics, University of Turku, Turku, Finland — 3Laboratoire Interdisciplinaire Carnot de Bourgogne, CNRS-Université de Bourgogne, Dijon, France — 4Institute for Advanced Study, Technical University of Munich, Garching, Germany
The requirement of fast and accurate initialization of qubits into known initial states is one important key for the realization of quantum information processing tasks. Our approach is to achieve cooling of a superconducting qubit by means of controlled coupling to an auxiliary qubit, in order to use the auxiliary qubit as entropy sink. Using optimal control theory (OCT), we show that the maximal fidelity and minimal time for realizing this fidelity depend on the initial state of the bipartite system consisting of primary and auxiliary qubit. When starting from a factorized state, the maximal fidelity is determined by the initial purity of the auxiliary qubit, while the minimal time is limited my the coupling strength. In case of correlated initial states this limit can be exceeded when allowing for time-dependent controls on the primary qubit. This shows that correlations can be exploited for resetting the qubit.