Superconducting van der Waals Devices For Quantum Technology

2D van Der Waals materials-based heterostructures have led to new devices for fundamental science and applications. Superconducting Josephson devices based on 2D materials offer unique opportunities to engineer new functionality for quantum technology.

I will present results from two classes of materials. First, proximitized graphene-based Josephson junctions lead to a quantum noise-limited parametric amplifier with performance comparable to best discrete amplifiers in this class.

Gate tunability of the center frequency of the amplifier, rather than flux, offers key advantages. An extension of graphene Josephson architecture to make state-of-the-art bolometers leveraging graphene’s low specific heat, and I will present initial results.

Second, twisted van Der Waals heterostructures based on high Tc super- conductors Bi2Sr2CaCu208+delta lead to the realization of a high-temperature Josephson diode for the first time. Such Josephson diodes offer an opportunity to engineer the current phase relationship and the resulting inductive response for many applications close to liquid nitrogen temperature.

Speaker: Mandar Deshmukh, Tata Institute of Fundamental Research