Voltage-Controlled Superconducting Quantum Bus
L. Casparis, N. J. Pearson, A. Kringh{\o}j, T. W. Larsen, F. Kuemmeth,, J. Nyg\r{a}rd, P. Krogstrup, K. D. Petersson, C. M. Marcus

TL;DR
This paper demonstrates a voltage-controlled superconducting quantum bus using an epitaxial semiconductor-superconductor nanowire, enabling tunable qubit coupling with high-speed switching and minimal coherence loss.
Contribution
It introduces a novel voltage-controlled superconducting switch that effectively tunes qubit interactions in a quantum bus without harming coherence.
Findings
Achieved up to 8-fold change in qubit-qubit coupling.
High-bandwidth switching on nanosecond timescales is possible.
Switching does not significantly degrade qubit coherence.
Abstract
We demonstrate the ability of an epitaxial semiconductor-superconductor nanowire to serve as a field-effect switch to tune a superconducting cavity. Two superconducting gatemon qubits are coupled to the cavity, which acts as a quantum bus. Using a gate voltage to control the superconducting switch yields up to a factor of 8 change in qubit-qubit coupling between the on and off states without detrimental effect on qubit coherence. High-bandwidth operation of the coupling switch on nanosecond timescales degrades qubit coherence.
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Taxonomy
TopicsQuantum and electron transport phenomena · Physics of Superconductivity and Magnetism · Quantum Computing Algorithms and Architecture
