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We experimentally study electron transport between two superconducting indiumleads, coupled to the WTe$_2$ crystal surface. WTe$_2$ is characterized bypresence of Fermi arc surface states, as a predicted type-II Weyl semimetalcandidate. We demonstrate Josephson current in unprecedentedly long 5~$\mu$mIn-WTe$_2$-In junctions, which is confirmed by $I-V$ curves evolution withtemperature and magnetic field. The Josephson current is mostly carried by thetopological surface states, which we demonstrate in a double-slit SQUIDgeometry, realized by coupling the opposite WTe$_2$ crystal surfaces.

Realization of a double-slit SQUID geometry by Fermi arc surface states in a WTe$_2$ Weyl semimetal