Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Y71: Improving Qubit Readout with Parametric Amplifiers
8:00 AM–10:48 AM,
Friday, March 10, 2023
Room: Room 407/408
Sponsoring
Unit:
DQI
Chair: Ted Thorbeck, IBM Quantum
Abstract: Y71.00001 : Flux-Pumped Josephson Traveling-Wave Parametric Amplifier with Reverse Isolation
8:00 AM–8:12 AM
Presenter:
Maxime Malnou
(National Institute of Standards and Technology)
Authors:
Maxime Malnou
(National Institute of Standards and Technology)
Jose A Estrada
(National Institute of Standards and Tech)
Benton T Miller
(University of Colorado, Boulder)
Jose Aumentado
(National Institute of Standards and Technology Boulder)
Florent Q Lecocq
(National Institute of Standards and Technology, Boulder)
In principle, an ideal TWPA has a unity reverse gain, and therefore strong isolation should only be necessary after the TWPA to protect the device under test (DUT) from extraneous noise. However, in practice, unavoidable signal and pump reflections leads to a finite amount of reverse gain. As a consequence, isolation between the TWPA and the DUT is required. In addition, the co-propagating pump is often delivered via a directional coupler, also placed between the DUT and the TWPA. These additional components limit the scalability and noise performance of the amplification chain.
In this talk, we will present a new type of TWPA which intends to mitigate spurious backaction by combining flux pumping and reverse isolation. This TWPA could be connected directly to the DUT, without intermediate isolator or directional coupler, leading to a highly efficient and scalable microwave readout chain.
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