Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 49: Poster Session: Superconductivity
TT 49.44: Poster
Mittwoch, 3. April 2019, 15:00–18:30, Poster D
Implementing an inductively shunted transmon qubit with tunable transverse and longitudinal coupling — •Daria Gusenkova1, Nataliya Maleeva1, Sebastian T. Skacel1,2, Martin Spiecker1, Lukas Grünhaupt1, Susanne Richer3, David DiVincenzo3, and Ioan M. Pop1,2 — 1Physikalisches Institut, Karlsruhe Institute of Technology, Germany — 2Institute of Nanotechnology, Karlsruhe Institute of Technology, Germany — 3JARA Institute for Quantum Information, RWTH Aachen University, Germany
The longitudinal qubit-resonator coupling is a prospective alternative to the commonly used transverse coupling scheme. The longitudinal interaction does not lead to the entanglement of qubit and resonator states. In addition to the advantage of a purely QND readout, it allows to build a scalable architecture with strictly local interactions.
We present first results towards the implementation of an inductively shunted transmon qubit with tunable transverse and longitudinal coupling to an embedded harmonic mode. The inductive shunt acts as a coupler and it combines Josephson junction arrays with compact, linear, low-loss inductances, making use of the high kinetic inductance of granular aluminum.
Besides overcoming fabrication challenges, originating from strict requirements on the circuit parameters, the main goal is to suppress phase slips in the JJ array, which prevent tuning to the pure longitudinal coupling regime.