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SUMMARY:Hybrid circuits with van-der-Waals superconductors
DESCRIPTION:Superconducting circuits are quantum devices that mimic the behavior of atomic systems, even though they are made up of macroscopic microwave circuit elements. Their tunability, high coherence, and strong coupling have led to their rapid development for quantum information processing. Traditional circuits are made using well-known superconductors such as aluminum or niobium, but incorporating novel superconductors into these circuits can allow us both to explore their properties and develop new types of quantum devices.In this talk, I will present our work on hybrid circuits incorporating micron-sized van-der-Waals superconductors. Using capacitive rather than galvanic contacts, we can couple these materials strongly to microwave resonators while maintaining good circuit coherence. I will discuss our measurements of the cuprate superconductor BSCCO, including the role of two-level-system defects in the microwave response, and recent measurements of the kagome superconductor CsV₃Sb₅, where the low-temperature response provides information about the superconducting gap structure and indicates the presence of nodes.Finally, I will discuss how the unusual properties of these superconductors could themselves be used to make new quantum circuits. In particular, I will introduce the flowermon, a proposed protected qubit based on a twisted junction between two d-wave superconductors.
LOCATION: Erwin Schrödinger Saal, Innsbruck
DTSTART:20260918T100000
DTEND:20260918T110000
TZID: Europe/Vienna
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