A Near Quantum Limited Sub-GHz TiN Kinetic Inductance Traveling Wave Parametric Amplifier Operating in a Frequency Translating Mode
arxiv(2024)
Abstract
We present the design and experimental characterization of a
kinetic-inductance traveling-wave parametric amplifier (KI-TWPA) for sub-GHz
frequencies. KI-TWPAs amplify signals through nonlinear mixing processes
supported by the nonlinear kinetic inductance of a superconducting transmission
line. The device described here utilizes a compactly meandered TiN microstrip
transmission line to achieve the length needed to amplify sub-GHz signals. It
is operated in a frequency translating mode where the amplified signal tone is
terminated at the output of the amplifier, and the idler tone at approximately
2.5 GHz is brought out of the cryostat. By varying the pump frequency, a gain
of up to 22 dB was achieved in a tunable range from about 450 to 850 MHz. Use
of TiN as the nonlinear element allows for a reduction of the required pump
power by roughly an order of magnitude relative to NbTiN, which has been used
for previous KI-TWPA implementations. This amplifier has the potential to
enable high-sensitivity and high-speed measurements in a wide range of
applications, such as quantum computing, astrophysics, and dark matter
detection.
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