Bias-free superconducting microwave nonreciprocity from a passive nonlinear resonator

arXiv:2611.10915v1 Announce Type: new Abstract: Routing microwave tones in a nonreciprocal fashion in a superconducting chip usually requires an external bias, commonly in the form of static magnetic fields, pump tones or temporal modulation. Here we demonstrate microwave nonreciprocity in a bias-free, passive platform, a single nonlinear superconducting resonator patterned in one film without Josephson junctions. Unequal coupling with the two feeding ports makes its nonlinear resonance shift direction-dependent, and its sharp Fano lineshape converts this asymmetric response into a large transmission contrast when excited from opposite directions. Our niobium nitride (NbN) device reaches a directional contrast of 53.0 dB at an insertion loss of 4.6 dB, and it exceeds 20 dB over 9.7 MHz.