Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 4: Superconductivity: Qubits I
TT 4.4: Vortrag
Montag, 12. März 2018, 10:15–10:30, H 2053
Fast flux control of 3D transmon qubits — •Stefan Oleschko1,2, Oscar Gargiulo1,2, Phani Muppalla1,2, Maximilian Zanner1,2, Aleksei Sharafiev1,2, and Gerhard Kirchmair1,2 — 1Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, Technikerstraße 21a, A-6020 Innsbruck, Austria — 2Institute for Experimental Physics, University of Innsbruck, Technikerstraße 25, A-6020 Innsbruck, Austria
An important feature in analog quantum simulation experiments with superconducting qubits [1] is the possibility to change the frequency of SQUID-based transmon qubits by applying magnetic flux. Implementing fast flux control on a transmon remains challenging in the 3D cavity architectures due to the presence of a massive metallic cavity. Here we introduce a new approach for fast flux control of 3D transmon qubits. We use a magnetic hose similar to the one proposed by C. Navau et al [2] to guide a fast flux pulse from the outside to the inside of a microwave cavity. This hose enables us to locally circumvent any magnetic shielding effects such as the appearance of eddy currents in cavities made out of copper or the Meissner effect in superconducting cavities made out of aluminum. First experiments show that the transition frequency of a transmon can be tuned within 50 nanoseconds. Besides the high speed, the frequency shift is precise, without showing any ringing or hysteresis. Using a magnetic hose with an aluminum cavity preserves the benefits of a superconducting cavity, like providing magnetic field shielding and a high internal quality factor, along with the possibility to fast-tune individual qubits.