A three-wave mixing kinetic inductance traveling-wave amplifier with near quantum-limited noise performance
Maxime Malnou, Michael Vissers, Jordan Wheeler, Joe Aumentado, Johannes Hubmayr, Joel Ullom, Jiansong Gao
We present the theoretical model and experimental characterization of a microwave kinetic inductance traveling-wave amplifier (KIT), whose noise performance, measured by a shot noise thermometer, approaches the quantum limit. Biased with a dc current, this KIT operates in a three-wave mixing fashion, thereby reducing by several orders of magnitude the power of the microwave pump tone, compared to conventional four-wave mixing KIT devices. It is built in an artificial trans- mission line intrinsically matched to 50 Ω}, whose dispersion allows for a controlled amplification bandwidth. We experimentally measure 17.6 (+1.1, -1.4) dB of gain across a 2 GHz bandwidth, with an input 1 dB compression power of -63 dBm within that bandwidth, in qualitative agreement with theory. Using the KIT as the first amplifier in an amplification chain, we measure a system added noise of 0.61 ± 0.08 K between 3.5 and 5.5 GHz, at least three times better than the added noise of commercially available, high-power handling amplifiers. The KIT contribution to this added noise is estimated to be 0.19 ± 0.1 K, consistent with the quantum limit on amplifier added noise. This device is therefore suitable to read out large arrays of microwave kinetic inductance detectors or thousands of superconducting qubits.
, Vissers, M.
, Wheeler, J.
, Aumentado, J.
, Hubmayr, J.
, Ullom, J.
and Gao, J.
A three-wave mixing kinetic inductance traveling-wave amplifier with near quantum-limited noise performance, Physical Review X
(Accessed September 27, 2023)