A three-wave mixing kinetic inductance traveling-wave amplifier with near-quantum-limited noise performance

• URL: http://arxiv.org/abs/2007.00638v2
• Date: Tue, 3 Nov 2020 02:15:52 GMT
• Title: A three-wave mixing kinetic inductance traveling-wave amplifier with near-quantum-limited noise performance
• Authors: M. Malnou, M. R. Vissers, J. D. Wheeler, J. Aumentado, J. Hubmayr, J. N. Ullom, J. Gao
• Abstract summary: We present a theoretical model and experimental characterization of a microwave kinetic inductance traveling-wave amplifier. The noise performance, measured by a shot-noise tunnel junction (SNTJ), approaches the quantum limit. This KIT is suitable to read large arrays of microwave kinetic inductance detectors and promising for multiplexed superconducting qubit readout.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present a theoretical model and experimental characterization of a microwave kinetic inductance traveling-wave amplifier (KIT), whose noise performance, measured by a shot-noise tunnel junction (SNTJ), approaches the quantum limit. Biased with a dc current, the KIT operates in a three-wave mixing fashion, thereby reducing by several orders of magnitude the power of the microwave pump tone and associated parasitic heating compared to conventional four-wave mixing KIT devices. It consists of a 50 Ohms artificial transmission line whose dispersion allows for a controlled amplification bandwidth. We measure $16.5^{+1}_{-1.3}$ dB of gain across a 2 GHz bandwidth with an input 1 dB compression power of -63 dBm, in qualitative agreement with theory. Using a theoretical framework that accounts for the SNTJ-generated noise entering both the signal and idler ports of the KIT, we measure the system-added noise of an amplification chain that integrates the KIT as the first amplifier. This system-added noise, $3.1\pm0.6$ quanta (equivalent to $0.66\pm0.15$ K) between 3.5 and 5.5 GHz, is the one that a device replacing the SNTJ in that chain would see. This KIT is therefore suitable to read large arrays of microwave kinetic inductance detectors and promising for multiplexed superconducting qubit readout.

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