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Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 1: Quantum Information: Concepts and Methods I

Q 1.2: Group Report

Monday, March 6, 2017, 15:00–15:30, P 2

Toward the Limits of Controlling Closed and Open Quantum Systems — •Thomas Schulte-Herbrüggen1, Ville Bergholm1,2, Frank K. Wilhelm3, and Gunther Dirr41Technical University of Munich (TUM) — 2University of Helsinki — 3University of Saarbrücken — 4University of Würzburg

Optimal control is proving more and more indispensable for steering quantum devices with high fidelity. Recent examples in NV centres include single-shot readout quantum sensing enhanced via a quantum memory [1].

Here we report on latest extensions of the optimal-control platform DYNAMO [2]. They include switchable noise as additional control beyond coherent ones and its implications for reachability under open-loop versus closed-loop control designs.

We propose experimental implementation of fast noise switching in a superconducting device, i.e. a two-qutrit GMon with fast tunable coupling to an open transmission line serving as a low-temperature bath. The setting is closest to the one available in the Martinis group.

References:

[1] S. Zaiser et al., Nature Commun. 7, 12279 (2016).

[2] S. Machnes et al., Phys. Rev. A 84, 022305 (2011).

[3] V. Bergholm, F.K. Wilhelm, and T. Schulte-Herbrüggen, arXiv:1605.06473

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