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

• URL: http://arxiv.org/abs/2402.08906v2
• Date: Tue, 16 Jul 2024 16:07:46 GMT
• Title: Decay-protected superconducting qubit with fast control enabled by integrated on-chip filters
• Authors: Aashish Sah, Suman Kundu, Heikki Suominen, Qiming Chen, Mikko Möttönen,
• Abstract summary: We introduce on-chip filters of the qubit drive exhibiting a stopband at the qubit frequency. We show up to 200-fold improvement in the measured relaxation time at the stopband. Our demonstration of on-chip filters and efficient subharmonic driving in a two-dimensional quantum processor paves the way for a scalable qubit architecture.
• Score: 1.8694575913085578
• License: http://creativecommons.org/licenses/by/4.0/
• 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 $\pi$ 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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