Suppressed crosstalk between two-junction superconducting qubits with mode-selective exchange coupling

Fixed-frequency qubits can suffer from always-on interactions that inhibit independent control. Here, we address this issue by experimentally demonstrating a superconducting architecture using qubits that comprise of two capacitively-shunted Josephson junctions connected in series. Historically know...

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Bibliographic Details
Published in:arXiv.org 2021-11
Main Authors: Finck, A D K, Carnevale, S, Klaus, D, Scerbo, C, Blair, J, McConkey, T G, Kurter, C, Carniol, A, Keefe, G, Kumph, M, Dial, O E
Format: Article
Language:English
Subjects:
Coupling
Crosstalk
Josephson junctions
Superconductivity
Online Access:Get full text
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Summary:Fixed-frequency qubits can suffer from always-on interactions that inhibit independent control. Here, we address this issue by experimentally demonstrating a superconducting architecture using qubits that comprise of two capacitively-shunted Josephson junctions connected in series. Historically known as tunable coupling qubits (TCQs), such two-junction qubits support two modes with distinct frequencies and spatial symmetries. By selectively coupling only one type of mode and using the other as our computational basis, we greatly suppress crosstalk between the data modes while permitting all-microwave two-qubit gates.
ISSN:2331-8422
DOI:10.48550/arxiv.2105.11495