Development of KTaO<sub>3</sub>-based superconducting parametric amplifiers

ORAL

Abstract

The recent discovery of superconductivity in KTaO3 (KTO)-based two dimensional electron gas (2DEG) has raised wide interest [1]. Using conductive atomic microscope lithography, we have patterned KTO-based superconducting weak links (WLs) and SQUIDs, which reveal the high kinetic inductance of its superconducting 2DEG [2]. The unusual inductive and capacitive properties of KTO make it a potential platform for various kinds of superconducting microwave circuits. Here we present our work towards characterizing kinetic inductance as well as dielectric loss tangent of KTO 2DEG using a microwave resonator [3]. We also report our attempts to realize a new type of parametric amplifier based on KTO where pumping is sent through the gate near a KTO weak link.

[1] Changjiang Liu, et al. Science 371, 716-721 (2021)

[2] Muqing Yu, et al. arXiv:2310.16051 (2023)

[3] S. Mallik, et al. Nat Commun 13, 4625 (2022)

*D.P., P.I. and J.L. acknowledge funding from DARPA SynQuaNon (HR00112490317). Thin film synthesis at the University of Wisconsin–Madison was supported by the US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES), under award number DE-FG02-06ER46327 (C.B.E.).

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Presenters

  • Muqing Yu

    • University of Pittsburgh

Authors

  • Muqing Yu

    • University of Pittsburgh

  • Jieun Kim

    • University of Wisconsin - Madison

  • Ranjani Ramachandran

    • University of Pittsburgh

  • Pubudu Gayan Wijesinghe

    • University of Pittsburgh

  • Jiangfeng Yang

    • University of Wisconsin - Madison

  • Zhuan Li

    • University of Pittsburgh

  • David Pekker

    • University of Pittsburgh

  • Patrick R Irvin

    • University of Pittsburgh

  • Chang-Beom Eom

    • University of Wisconsin-Madison

  • Jeremy Levy

    • University of Pittsburgh