Hannover 2020 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 22: Posters: Quantum Optics and Photonics II
Q 22.37: Poster
Dienstag, 10. März 2020, 16:30–18:30, Empore Lichthof
Fundamental Bounds for Qubit Reset — Daniel Basilewitsch1, •Jonas Fischer1, 2, 3, Daniel M. Reich1, 3, Dominique Sugny2, and Christiane P. Koch1, 3 — 1Theo. Physik, Universität Kassel, D-34132 Kassel, Germany — 2Lab. ICB, Université de Bourgogne-Franche Comté, F-21078 Dijon Cedex, France — 3Freie Universität Berlin, Theo. Physik, Arnimallee 14, 14195 Berlin, Germany
One of the most fundamental tasks in the field of quantum technology is the purification or reset of a qubit. This process is interesting from a theoretical point of view because it raises the question of how fast entropy can be exported from a system, as well as for applications like quantum computing or quantum cryptography.
We consider a controllable qubit in contact with an environment. The environment can be mapped onto a representative pseudo-mode, decaying into a weakly coupled heat bath [D. Basilewitsch et al, New J. Phys. 19, 113042 (2017)], which does not play a role for the speed limit and can be neglected. Because qubit and ancilla can be flexibly engineered, we investigate which sort of coupling and control is optimal for the reset task and search for a global speed limit.
Using the Cartan decomposition we can deduce necessary conditions for the interaction and control. We give the optimal choice for the control field depending on the coupling and also determine the overall speed limit.