Dephasing in Fluxonium Qubits from Coherent Quantum Phase Slips

Randeria, Mallika T.; Hazard, Thomas M.; Di Paolo, Agustin; Azar, Kate; Hays, Max; Ding, Leon; An, Junyoung; Gingras, Michael; Niedzielski, Bethany M.; Stickler, Hannah; Grover, Jeffrey A.; Yoder, Jonilyn L.; Schwartz, Mollie E.; Oliver, William D.; Serniak, Kyle

doi:10.1103/PRXQuantum.5.030341

Dephasing in Fluxonium Qubits from Coherent Quantum Phase Slips

Journal Article · Tue Aug 27 00:00:00 EDT 2024 · PRX Quantum

DOI:https://doi.org/10.1103/PRXQuantum.5.030341· OSTI ID:2438138

; ; ; ; ; ; ; ; ; Stickler, Hannah; ; Yoder, Jonilyn L.; ; ;

Phase slips occur across all Josephson junctions (JJs) at a rate that increases with the impedance of the junction. In superconducting qubits composed of JJ-array superinductors—such as fluxonium—phase slips in the array can lead to decoherence. In particular, phase-slip processes at the individual array junctions can coherently interfere, each with an Aharonov-Casher phase that depends on the offset charges of the array islands. These coherent quantum phase slips (CQPS) perturbatively modify the qubit frequency, and therefore charge noise on the array islands will lead to dephasing. By varying the impedance of the array junctions, we design a set of fluxonium qubits in which the expected phase-slip rate within the JJ array changes by several orders of magnitude. We characterize the coherence times of these qubits and demonstrate that the scaling of CQPS-induced dephasing rates agrees with our theoretical model. Furthermore, we perform noise spectroscopy of two qubits in regimes dominated by either CQPS or flux noise. We find that the noise power spectrum associated with CQPS dephasing appears to be featureless at low frequencies and not $1 / f$ . Numerical simulations indicate that this behavior is consistent with charge noise generated by charge-parity fluctuations within the array. Our findings broadly inform JJ-array-design trade-offs, relevant for the numerous superconducting-qubit designs employing JJ-array superinductors.

Published by the American Physical Society 2024

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Research Organization:: Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0014664

OSTI ID:: 2438138

Alternate ID(s):: OSTI ID: 2582665

Journal Information:: PRX Quantum, Journal Name: PRX Quantum Journal Issue: 3 Vol. 5; ISSN 2691-3399; ISSN PQRUAG

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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