High-Efficiency, Low-Loss Floquet-mode Traveling Wave Parametric Amplifier

• URL: http://arxiv.org/abs/2503.11812v2
• Date: Tue, 15 Apr 2025 19:45:48 GMT
• Title: High-Efficiency, Low-Loss Floquet-mode Traveling Wave Parametric Amplifier
• Authors: Jennifer Wang, Kaidong Peng, Jeffrey M. Knecht, Gregory D. Cunningham, Andres E. Lombo, Alec Yen, Daniela A. Zaidenberg, Michael Gingras, Bethany M. Niedzielski, Hannah Stickler, Katrina Sliwa, Kyle Serniak, Mollie E. Schwartz, William D. Oliver, Kevin P. O'Brien,
• Abstract summary: We experimentally demonstrate the first Floquet-mode traveling-wave parametric amplifier (Floquet TWPA)<n>Floquet TWPA achieves nearly quantum-limited noise performance, minimal dissipation, and broadband operation.<n>These general-purpose Floquet TWPAs are suitable for fast, high-fidelity multiplexed readout in large-scale quantum systems.
• Score: 3.8846025204068835
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Advancing fault-tolerant quantum computing and fundamental science necessitates quantum-limited amplifiers with near-ideal quantum efficiency and multiplexing capability. However, existing solutions typically achieve one at the expense of the other. In this work, we experimentally demonstrate the first Floquet-mode traveling-wave parametric amplifier (Floquet TWPA), which achieves nearly quantum-limited noise performance, minimal dissipation, and broadband operation, breaking the presumption that broadband amplifiers introduce higher noise. We achieve a system measurement efficiency of $65.1\pm5.8\%$ when measuring a superconducting qubit, which to our knowledge is the highest-reported in a superconducting qubit readout experiment utilizing phase-preserving amplifiers. Our device exhibits $>20$-dB amplification over a $3$-GHz instantaneous bandwidth, $<\!0.5\,$-dB average in-band insertion loss, and the highest reported intrinsic quantum efficiency for a TWPA of $92.1\pm7.6\%$, relative to an ideal phase-preserving amplifier. Fabricated in a superconducting qubit process, these general-purpose Floquet TWPAs are suitable for fast, high-fidelity multiplexed readout in large-scale quantum systems and future monolithic integration with quantum processors.

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