2023/08/28 by Arkady Fedorov, N. Pradeep Kumar, Fedorov, Arkady +9
Engineering · Physics and Astronomy · #Full-Duplex Wireless Communications #Electromagnetic Simulation and Numerical Methods #Physics of Superconductivity and Magnetism
paper · pdf · doi:10.48550/arxiv.2308.14643
Building large-scale superconducting quantum circuits will require miniaturisation and integration of supporting devices including microwave circulators, which are currently bulky, stand-alone components. Here we report the realisation of a passive on-chip circulator which is made from a loop consisting of three tunnel-coupled superconducting islands, with DC-only control fields. We observe the effect of quasiparticle tunnelling, and we dynamically classify the system into different quasiparticle sectors. When tuned for circulation, the device exhibits strongly non-reciprocal 3-port scattering, with average on-resonance insertion loss of 2 dB, isolation of 14 dB, power reflectance of -11 dB, and a bandwidth of 200 MHz.