Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 99: Poster Session: Transport
TT 99.42: Poster
Donnerstag, 15. März 2018, 15:00–19:00, Poster B
Implementing an inductively shunted transmon qubit with tunable transverse and longitudinal coupling — •Sebastian T. Skacel1, Nataliya Maleeva1, Daria Gusenkova1, Susanne Richer2, David DiVincenzo2, and Ioan M. Pop1 — 1Physikalisches Institut, Karlsruher Institut für Technologie, D-76131 Karlsruhe, Germany — 2JARA Institute for Quantum Information, RWTH Aachen University, 52056 Aachen, Germany
We discuss some of the challenges in the physical implementation of an inductively shunted transmon qubit with flux-tunable transverse and longitudinal coupling to an embedded harmonic mode. The inductive shunt consists of a combination of compact, low-loss and linear inductances, in the range of several nH, and chains of Josephson junctions. The former could be realized by superconducting strips consisting of a high kinetic inductance material, granular aluminum, while the latter can be made from standard thin-film aluminum. The electrical connections between these different metallic layers could be realized using recently developed argon ion cleaning and contacting techniques which preserve the coherence of the circuit. The sample is enclosed in a 3D waveguide which offers the advantage of strong coupling for the resonator mode inside the designed pass band between 6 and 8 GHz, while the qubit mode can be efficiently decoupled from the microwave environment.