Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 16: Quantum Information (Concepts and Methods) III
Q 16.3: Talk
Tuesday, March 10, 2020, 14:30–14:45, e001
Exploring the Limits of Open Quantum Dynamics: From Toy Models to Applications — •Frederik vom Ende1, Gunther Dirr2, and Thomas Schulte-Herbrüggen1 — 1TU Munich, 85748 Garching, Germany — 2University of Würzburg, 97074 Würzburg, Germany
Which quantum states can be reached by coherently controlling n-level quantum systems coupled to a thermal bath in a switchable Markovian way?
We investigate the reachable sets of coherently controllable open quantum systems with switchable coupling to a thermal bath of arbitrary temperature T. The core problem boils down to studying points in the standard simplex with two types of amenable controls: (i) permutations within the simplex, (ii) contractions by a dissipative semigroup.
Our work focusses on how the solutions to the core problem pertain to the reachable set of the original controlled Markovian quantum system. We completely characterize the case T=0 (amplitude damping) and present partial results for 0<T<∞.
Moreover, one can structure the whole class of normal Lindblad generators in terms of reachability given full unitary control.