Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 4: Superconductivity: Qubits I
TT 4.7: Vortrag
Montag, 12. März 2018, 11:00–11:15, H 2053
Adding ZZ-coupling to transmon qubits — •Alexander Stehli1, Jochen Braumüller1, Hannes Rotzinger1, Andre Schneider1, Martin Weides1, and Alexey V. Ustinov1,2 — 1Physikalisches Institut, Karlsruher Institut für Technologie, Karlsruhe, Deutschland — 2Russian Quantum Center, National Institute of Science and Technology MISIS, Moscow, Russia
Versatile quantum elements enable higher connectivity for quantum computing or the quantum simulation of intricate physics using only few physical qubits. In superconducting quantum circuits, the transmon qubit is the most widely used architecture, owed to its robustness and good coherence properties. While typical transmon designs solely allow for an XX-interaction between neighboring qubits, the concentric transmon [1] was predicted to feature an additional ZZ-coupling [2]. It is mediated by the non-vanishing dc magnetic field of the qubits in the flux-biased state.
In this work, we explore the possibility of ZZ-interaction between two concentric transmon qubits. The qubits are galvanically coupled to maximize their mutual inductance, which is proportional to this effect. In time-resolved microwave measurements, we determine the ZZ-coupling strength from a shift of the qubit transition frequency. First experiments indicate a coupling strength on the order of several MHz.
J. Braumüller et al., Appl. Phys. Lett. 108, 032601 (2016)
J.-M. Reiner et al., Phys. Rev. A 94, 032338 (2016)