IQIM Postdoctoral and Graduate Student Seminar

Abstract: Superconducting devices are foundational components of many quantum computing architectures, playing critical roles in qubit design and cryogenic memory. To accelerate the development of quantum computing, it is essential to integrate and couple diverse quantum properties with superconductors to enable new functionalities. 2D van der Waals materials, whose single-atom-thick atomic layers can be easily obtained and recombined, offer an ideal platform for creating coupled quantum interfaces. In this talk, I will present two examples of how this approach can be leveraged to advance superconducting quantum technologies. First, I will demonstrate how I integrate topology and magnetism, which are typically detrimental to superconductivity, within a 2D superconducting junction made of a topological superconductor. Specifically, the field- and temperature-trainable supercurrent diode effect I observed in this junction provides unambiguous evidence for the coupling between topology, magnetism, and superconductivity, underscoring the material's potential for robust topological qubits [1]. Second, I will describe how I integrate a 2D multiferroic material – with both magnetic and electric order – into a 2D superconducting device. The coupling between the multiferroic order and superconductivity results in an unusual field-resilient supercurrent diode that can operate within a magnetic field range of ±10 mT. This level of field tolerance meets industrial standards for the first time, making it suitable for use as a cryogenic memory in quantum computers [2]. My research establishes a new way to engineering coupled quantum interfaces, with the potential for the next generation of superconducting quantum technologies.

References:

[1] G. Qiu*, H.-Y. Yang*, et al. Nat. Commun. 14, 6691 (20

Following the talk, lunch will be provided on the lawn outside East Bridge.