Downstream Noise of a Superconductor-Quantum Hall Interface

Interfaces between a Quantum Hall region and a superconductor allow for the formation of hybrid electron-hole states known as chiral Andreev edge states. These states have been previously identified by our group via measurements of the non-local DC resistance of a graphene sample with a superconducting contact. We perform measurements of the shot noise in a device which shows significant DC signatures of the chiral Andreev edge state. While we observe noise signatures comparable to those of a recent sudy, we find no correlation between the shot noise and the DC chiral Andreev edge state signal. We discuss alternative explanations of the observed signal.