Quantum Hall Interferometry Reveals Hidden Andreev Physics
![A Hong-Ou-Mandel interferometer-configured with graphene sheets under a perpendicular magnetic field-demonstrates chiral edge state behavior, where the scattering region between source and drain contacts-governed by parameters such as the insulator or superconducting gap Δ and tunable Fermi energies [latex]\mu_{L,c,R}[/latex]-effectively creates a “p-S-n” junction exhibiting distinct chiralities contingent on the relative magnitudes of [latex]\mu_L[/latex], [latex]\mu_c[/latex], and [latex]\mu_R[/latex].](https://arxiv.org/html/2604.09463v1/x1.png)
Researchers have leveraged a superconducting beam splitter within a Quantum Hall interferometer to observe and characterize crossed Andreev reflection, a key process for manipulating quantum information.







