Decay-protected superconducting qubit with fast control enabled by integrated on-chip filters

Aashish Sah; Suman Kundu; Heikki Suominen; Qiming Chen; Mikko Möttönen

doi:10.1038/s42005-024-01733-3

Decay-protected superconducting qubit with fast control enabled by integrated on-chip filters

Aashish Sah^*
, Suman Kundu
, Heikki Suominen
, Qiming Chen
, Mikko Möttönen

^*Corresponding author for this work

BA62 Microelectronics and quantum technology

Aalto University
VTT (former employee or external)

Research output: Contribution to journal › Article › Scientific › peer-review

10 Citations (Scopus)

Abstract

Achieving fast gates and long coherence times for superconducting qubits presents challenges, typically requiring either a stronger coupling of the drive line or an excessively strong microwave signal to the qubit. To address this, we introduce on-chip filters of the qubit drive exhibiting a stopband at the qubit frequency, thus enabling long coherence times and strong coupling at the subharmonic frequency, facilitating fast single-qubit gates, and reduced thermal load. The filters exhibit an extrinsic relaxation time of a few seconds while enabling sub-10-ns gates with subharmonic control. Here we show up to 200-fold improvement in the measured relaxation time at the stopband. Furthermore, we implement subharmonic driving of Rabi oscillations with a π pulse duration of 12 ns. Our demonstration of on-chip filters and efficient subharmonic driving in a two-dimensional quantum processor paves the way for a scalable qubit architecture with reduced thermal load and noise from the control line.

Original language	English
Article number	227
Journal	Communications Physics
Volume	7
DOIs	https://doi.org/10.1038/s42005-024-01733-3
Publication status	Published - Dec 2024
MoE publication type	A1 Journal article-refereed

Funding

We express our gratitude to the KAUTE Foundation for their support through the Ph.D. grant awarded to the first author. We acknowledge the European Research Council under the Advanced Grant no. 101053801 (ConceptQ), Business Finland under the Quantum Technologies Industrial project (Grant no. 2118781) and Academy of Finland under its Centre of Excellence Quantum Technology Finland (Grant no. 352925) and through the Finnish Quantum Flagship. Special thanks are extended to Sergei Lemziakov, Dmitrii Lvov, and Joonas Peltonen for their invaluable assistance with the Otanano cryogenic facility. The authors acknowledge Giacomo Catto, Timm M\u00F6rstedt, and Priyank Singh for useful discussions related to the fabrication and Jukka-Pekka Kaikkonen from VTT Technical Research for providing us with the unpatterned Niobium-on-Silicon wafer. Furthermore, we are thankful for the enriching general discussions on the subject matter with Michael Hatridge, Florian Blanchet, Arman Alizadeh, Wallace Santos Teixeira, Vasilii Vadimov, and Johannes Heinsoo. We thank Eric Hyypp\u00E4 for encouraging discussions and insightful comments on the manuscript.

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Cite this

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abstract = "Achieving fast gates and long coherence times for superconducting qubits presents challenges, typically requiring either a stronger coupling of the drive line or an excessively strong microwave signal to the qubit. To address this, we introduce on-chip filters of the qubit drive exhibiting a stopband at the qubit frequency, thus enabling long coherence times and strong coupling at the subharmonic frequency, facilitating fast single-qubit gates, and reduced thermal load. The filters exhibit an extrinsic relaxation time of a few seconds while enabling sub-10-ns gates with subharmonic control. Here we show up to 200-fold improvement in the measured relaxation time at the stopband. Furthermore, we implement subharmonic driving of Rabi oscillations with a π pulse duration of 12 ns. Our demonstration of on-chip filters and efficient subharmonic driving in a two-dimensional quantum processor paves the way for a scalable qubit architecture with reduced thermal load and noise from the control line.",

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Decay-protected superconducting qubit with fast control enabled by integrated on-chip filters

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