A flux tunable superconducting quantum circuit based on Weyl semimetal MoTe2

TL;DR

This paper demonstrates a flux-tunable superconducting quantum circuit using Weyl semimetal MoTe2, showcasing its potential for topological quantum information processing.

Contribution

It introduces a novel flux-tunable transmon-like SQUID circuit based on Weyl semimetal MoTe2, integrating topological materials into quantum circuits.

Findings

Successful fabrication of MoTe2-based Josephson junctions

Demonstration of magnetic flux tuning of the resonant frequency

Potential for topological quantum information applications

Abstract

Weyl semimetals for their exotic topological properties have drawn considerable attention in many research fields. When in combination with s-wave superconductors, the supercurrent can be carried by their topological surface channels, forming junctions mimic the behavior of Majorana bound states. Here, we present a transmon-like superconducting quantum intereference device (SQUID) consists of lateral junctions made of Weyl semimetal Td-MoTe2 and superconducting leads niobium nitride (NbN). The SQUID is coupled to a readout cavity made of molybdenum rhenium (MoRe), whose response at high power reveal the existence of the constituting Josephson junctions (JJs). The loop geometry of the circuit allows the resonant frequency of the readout cavity to be tuned by the magnetic flux. We demonstrate a JJ made of MoTe2 and a flux-tunable transmon-like circuit based on Weyl materials. Our study provides a platform to utilize topological materials in SQUID-based quantum circuits for potential applications in quantum information processing.