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The interfacial coupling of two materials with different ordered phases, suchas a superconductor (S) and a ferromagnet (F) is driving new fundamentalphysics and innovative applications. For example, the creation of spin-filterJosephson junctions and the demonstration of triplet supercurrents havesuggested the potential of a dissipationless version of spintronics based onunconventional superconductivity. Here we demonstrate evidence for activequantum applications of S-F-S junctions, through the observation of macroscopicquantum tunneling in Josephson junctions with GdN ferromagnetic insulatorbarriers. We prove a clear transition from thermal to quantum regime at acrossover temperature of about 100 mK at zero magnetic field in junctions whichdemonstrate a clear signature of unconventional superconductivity. Followingprevious demonstration of passive S-F-S phase shifters in a phase qubit, ourresult paves the way to the active use of spin filter Josephson systems inquantum hybrid circuits.

Macroscopic quantum tunneling in spin filter ferromagnetic Josephson junctions