Interference of chiral Andreev edge states in a multi-terminal Josephson junction*

We study the interference effects of chiral Andreev edge states (CAES) in a multiterminal Josephson junction operated in the quantum Hall regime. On well quantized QH plateaus, we observe CAES interference in the form of voltage fluctuations downstream from the grounded superconducting contact. We have previously attributed this interference to successive electron-hole conversion along the quantum Hall-superconducting interface. Here, we show that these flucuations also exist in the Hall voltage, indicating a second order effect whereby the downstream particle experiences an additional electron-hole conversion along more than one superconducting contact. These observations indicate the potential for coherent control of the chiral Andreev edge states.