Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Quantum Information (Concepts and Methods) II
Q 27.1: Gruppenbericht
Mittwoch, 13. März 2019, 10:30–11:00, S HS 001 Chemie
Quantum Dynamics Taken to the Limit by Optimal Control — •Thomas Schulte-Herbrüggen1, Ville Bergholm1, Witlef Wieczorek2, and Michael Keyl3 — 1Dept. Chem., TU Munich — 2Dept. Microtechnology, Chalmers University, Gothenburg, Sweden — 3Dahlem Centre for Complex Quantum Systems, FU Berlin
Optimal control methods are often key to achieving high fidelity implementations in actual experiments. Examples meanwhile pertain to quantum information processing, quantum simulation, and quantum sensing.
First, we exemplify how adding a steerable atom on top of a cavity coupled to a mechanical oscillator gives (approx.) full controllability on the oscillator side and allows for preparing any state of the oscillator subsystem from any initial state. Thus, the extension overcomes limitations of previous designs of a cavity coupled to an oscillator only, where linear feedback from homodyne detection then is limited to interconverting within equivalence classes of Gaussian oscillator states or states with constant Wigner negativity. Adding an interacting atom opens the way to controlled dynamics including interchange between different equivalence classes.
The results build upon our optimal-control platform dynamo also extended to allowing for fast switchable noise on top of coherent controls.
We round up by showing how to use these features as internal cooling device in superconducting qudits (GMons) with tunable coupling to an open transmission line.