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arXiv · 2303.04784

Quasiparticle dynamics in epitaxial Al-InAs planar Josephson junctions

Bassel Heiba Elfeky·William M. Strickland·Jaewoo Lee·James T. Farmer·Sadman Shanto·Azarin Zarassi·Dylan Langone·Maxim G. Vavilov·Eli M. Levenson-Falk·Javad Shabani
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Abstract

Quasiparticle (QP) effects play a significant role in the coherence and fidelity of superconducting quantum circuits. The Andreev bound states of high transparency Josephson junctions can act as low-energy traps for QPs, providing a mechanism for studying the dynamics and properties of both the QPs and the junction. We study the trapping and clearing of QPs from the Andreev bound states of epitaxial Al-InAs Josephson junctions incorporated in a superconducting quantum interference device (SQUID) galvanically shorting a superconducting resonator to ground. We use a neighboring voltage-biased Josephson junction to inject QPs into the circuit. Upon the injection of QPs, we show that we can trap and clear QPs when the SQUID is flux-biased. We examine effects of the microwave loss associated with bulk QP transport in the resonator, QP-related dissipation in the junction, and QP poisoning events. By monitoring the QP trapping and clearing in time, we study the dynamics of these processes and find a time-scale of few microseconds that is consistent with electron-phonon relaxation in our system and correlated QP trapping and clearing mechanisms. Our results highlight the QP trapping and clearing dynamics as well as the associated time-scales in high transparency Josephson junctions based fabricated on Al-InAs heterostructures.

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Bassel Heiba Elfeky, William M. Strickland, Jaewoo Lee, James T. Farmer, Sadman Shanto, Azarin Zarassi, Dylan Langone, Maxim G. Vavilov, Eli M. Levenson-Falk, Javad Shabani. 2023-03-08. Quasiparticle dynamics in epitaxial Al-InAs planar Josephson junctions. https://doi.org/10.1103/prxquantum.4.030339

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