Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 41: Poster: Quantum Optics and Photonics II
Q 41.38: Poster
Wednesday, March 13, 2019, 16:15–18:15, S Fobau Physik
Time - Optimal Control of Qubit Purification — •Jonas Fischer1,2, Dominique Sugny1,3, and Christiane Koch2,3 — 1Laboratoire Interdisciplinaire Carnot de Bourgogne, University of Bourgogne-Franche-Comte, Dijon, France — 2Laboratoire Interdisciplinaire Carnot de Bourgogne, UniversInstitute of Physics, University of Kassel, Kassel, Germany — 3Institute for Advanced Study, Technical University of Munich, Garching, Germany
The purification of a qubit is a common task in quantum control and necessary for quantum technology. We follow the idea of arithmetic cooling and couple the qubit to a structured environment made of a two-level quantum system (TLS) and a Markovian bath. It is possible to deduce analytic formulas and a simple geometric description for the minimal time needed to reach the state of maximum purity. We can further show that the purity can be further increased while the necessary time decreases by adding initial correlations between the qubit and the TLS. The results also show the transition between the Markovian and Non-Markovian dynamics and how Non-Markovianity is beneficial for this task.