Passive On-Chip Superconducting Circulator Using a Ring of Tunnel Junctions
Clemens Mueller, Shengwei Guan, Nicolas Vogt, Jared H Cole, Thomas M Stace
Physical Review Letters | AMER PHYSICAL SOC | Published : 2018
We present the design of a passive, on-chip microwave circulator based on a ring of superconducting tunnel junctions. We investigate two distinct physical realizations, based on Josephson junctions (JJs) or quantum phase slip elements (QPS), with microwave ports coupled either capacitively (JJ) or inductively (QPS) to the ring structure. A constant bias applied to the center of the ring provides an effective symmetry breaking field, and no microwave or rf bias is required. We show that this design offers high isolation, robustness against fabrication imperfections and bias fluctuations, and a bandwidth in excess of 500 MHz for realistic device parameters.
Awarded by Australian Research Council
We thank A. Blais, T. Duty, S. Filip, W. Guichard, N. Roch, H. Rotzinger, P. Scarlino, and S. Skacel for discussions and comments. This work was supported by the Australian Research Council under the Discovery and Centre of Excellence funding schemes (Projects No. DP140100375, No. CE110001013, and No. CE170100039). Computational resources were provided by the NCI National Facility systems at the Australian National University through the National Computational Merit Allocation Scheme supported by the Australian government.