Pure kinetic inductance coupling for cQED with flux qubits

We demonstrate a qubit-readout architecture where the dispersive coupling is entirely mediated by a kinetic inductance. This allows us to engineer the dispersive shift of the readout resonator independent of the qubit and resonator capacitances. We validate the pure kinetic coupling concept and demonstrate various generalized flux qubit regimes from plasmon to fluxon, with dispersive shifts ranging from 60 kHz to 2 MHz at the half-flux quantum sweet spot. We achieve readout performances comparable to conventional architectures with quantum state preparation fidelities of 99.7% and 92.7% for the ground and excited states, respectively, and below 0.1% leakage to non-computational states.

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Institutions

Publication Details

Journal
Applied Physics Letters
Published
2024-08-05
DOI
https://doi.org/10.1063/5.0218361
Citations
3
Primary Topic
Quantum Information and Cryptography
Type
article
Field-Weighted Citation Impact
1.04

Funders

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article

Pure kinetic inductance coupling for cQED with flux qubits

Mathieu Féchant, Simon Geisert, Simon Günzler, Nicolas Gosling et al.
3 citations
Applied Physics Letters
Quantum Information and Cryptography
1.04
article

Pure kinetic inductance coupling for cQED with flux qubits

Mathieu Féchant, Simon Geisert, Simon Günzler, Nicolas Gosling, Martin Spiecker, Thomas Reisinger, Wolfgang Wernsdorfer, Patrick Paluch, D. J. Rieger, Ioan M. Pop, Patrick Winkel, Denis Bénâtre, Soeren Ihssen, Nicolas Zapata
article en
3 citations

Abstract

We demonstrate a qubit-readout architecture where the dispersive coupling is entirely mediated by a kinetic inductance. This allows us to engineer the dispersive shift of the readout resonator independent of the qubit and resonator capacitances. We validate the pure kinetic coupling concept and demonstrate various generalized flux qubit regimes from plasmon to fluxon, with dispersive shifts ranging from 60 kHz to 2 MHz at the half-flux quantum sweet spot. We achieve readout performances comparable to conventional architectures with quantum state preparation fidelities of 99.7% and 92.7% for the ground and excited states, respectively, and below 0.1% leakage to non-computational states.

Applied Physics LettersVol. 125(6)
University of Stuttgart (DE), Karlsruhe Institute of Technology (DE), Yale University (US)
European Commission, Deutsche Forschungsgemeinschaft, Bundesministerium für Bildung und Forschung, Leibniz-Gemeinschaft
Sustainable cities and communities
Openalex Percentile: Top 19%
Quantum Information and Cryptography
1.04
DOIOpen Access PDFOpenAlex
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Pure kinetic inductance coupling for cQED with flux qubits — Mathieu Féchant, Simon Geisert, et al. · Applied Physics Letters (2024) | TGRS Research Map | TGRS