Decay-protected superconducting qubit with fast control enabled by integrated on-chip filters
arxiv(2024)
摘要
Subharmonic control of superconducting qubits simultaneously facilitates fast
single-qubit gates, long coherence times, and reduced thermal load. However,
its implementation requires a very strong coupling of the drive line to the
qubit or an excessively strong microwave signal. To address this challenge, we
introduce on-chip filters of the qubit drive that exhibit a stopband at the
resonance frequency and ultra-strong coupling at the subharmonic frequency. The
on-chip filters are designed to demonstrate qubit T_1 in the millisecond
range while enabling fast gates of tens of nanoseconds with subharmonic
control. For a resonant drive, we experimentally show a maximum of 200-fold
improvement in the measured T_1 and a factor of 220 suppression in the
measured Rabi frequency at the stopband. Furthermore, we successfully
implemented subharmonic driving of Rabi oscillations with a π-pulse
duration of 12 ns. Our demonstration of on-chip filters and the resulting
introduction of 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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