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Superconducting Qubits

Pure kinetic inductance coupling for cQED with flux qubits

arXiv

Authors: Simon Geisert, Soeren Ihssen, Patrick Winkel, Martin Spiecker, Mathieu Fechant, Patrick Paluch, Nicolas Gosling, Nicolas Zapata, Simon Günzler, Dennis Rieger, Denis Bénâtre, Thomas Reisinger, Wolfgang Wernsdorfer, Ioan M. Pop

Year

2024

Paper ID

65073

Status

Preprint

Abstract Read

~2 min

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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.

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We demonstrate a qubit-readout architecture where the dispersive coupling is entirely mediated by a kinetic inductance.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2407.16342 [2] arXiv https://arxiv.org/abs/2407.16342 [3] Publisher https://arxiv.org/abs/2407.16342

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