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

Autor: Sah, Aashish, Kundu, Suman, Suominen, Heikki, Chen, Qiming, Möttönen, Mikko
Rok vydání: 2024
Předmět:
Zdroj: Commun Phys 7, 227 (2024)
Druh dokumentu: Working Paper
DOI: 10.1038/s42005-024-01733-3
Popis: 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.
Comment: Main document (15 pages, 5 figures), Supplementary material (10 pages, 7 figures, 1 table)
Databáze: arXiv
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