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TT: Fachverband Tiefe Temperaturen

TT 55: Poster Session: Superconductivity 2

TT 55.9: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P2-OG3

Coherence properties of superconducting qubits in large in-plane magnetic fields — •Andre Schneider, Jochen Braumüller, Marco Pfirrmann, Alexey V. Ustinov, and Martin Weides — Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany

We intend to directly interface thin film ferromagnets with planar superconducting qubits to study the quantum dynamics within the magnet. To achieve this, superconducting qubits have to be placed in or close to a strong static magnetic field.

As a first step, we experimentally study the coherence properties of superconducting qubits under the influence of an external magnetic field which is oriented in parallel to the plane of the chip. The qubit is a superconducting concentric transmon having a microstrip geometry [1] showing up to 10 µs coherence times T1 and T2 at zero magnetic field. Qubit properties such as relaxation and dephasing times, as well as flux noise, are measured in an external field up to the mT range at temperatures below 50 mK.

[1] Braumüller et al., APL 108, 032601 (2016)