Spin-resolved Andreev transport in quantum Hall edges of a proximitized van der Waals heterostructure

Topological superconductivity is a phase of matter that hosts non-Abelian quasiparticles, the building blocks for error-protected quantum computation. A well-known example is the Majorana quasiparticle. While several materials have been demonstrated to support topological superconductivity, most of them do not allow for the implementation of a universal set of protected logic gates. Van der Waals materials present a unique playground for topological superconductivity because they readily provide the ingredients to realize the quasiparticles suitable for universal topological quantum computation. Here, we show experiments on van der Waals heterostructures towards engineering non-Abelian quasiparticles from the quantum Hall state with induced superconductivity. Local electrostatic control of the graphene device enables spin-resolved Andreev transport. Advanced heterostructures including atomically flat (graphite) gates that fully encapsulate graphene significantly bring down the magnetic fields required for symmetry-broken and fractional quantum Hall states.