Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session G61: Quantum Amplifiers I: Novel Designs and Materials
11:30 AM–2:18 PM,
Tuesday, March 5, 2024
Room: 208AB
Sponsoring
Unit:
DQI
Chair: Kaidong Peng, Massachusetts Institute of Technology MI
Abstract: G61.00012 : Fabrication of vacuum-gap microstrip structuresfor impedance matching traveling-wave parametric amplifiers
2:06 PM–2:18 PM
Presenter:
Christian Schlager
(IQOQI Innsbruck)
Authors:
Christian Schlager
(IQOQI Innsbruck)
Romain Albert
(University of Innsbruck)
Gerhard Kirchmair
(University of Innsbruck)
significant progress with near quantum-limited noise performance and broad band amplification being achieved
by multiple research groups. Nevertheless, some challenges remain, offering room for further improvement.
One of these challenges is to provide enough capacitance over the length of a TWPA to compensate for the
nonlinear inductance used for amplification, without introducing extensive noise from dielectric losses. In this
work we present a novel fabrication process for vacuum-gap microstrips where the ground plane is supported
above the central conductor in a free-standing tunnel-like structure. The process is compatible with a range
of different materials and, in addition to high-capacitance transmission lines, also enables the creation of air-
bridges and compact capacitors. The performance of the fabrication is examined using distributed aluminum
and granular aluminum resonators in a cryogenic dilution refrigerator setup, already anticipating the future
application in a kinetic inductance TWPA.
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