Passive superconducting circulator on a chip

• URL: http://arxiv.org/abs/2208.13339v2
• Date: Mon, 5 Sep 2022 00:29:52 GMT
• Title: Passive superconducting circulator on a chip
• Authors: Rohit Navarathna, Dat Thanh Le, Andr\'es Rosario Hamann, Hien Duy Nguyen, Thomas M. Stace and Arkady Fedorov
• Abstract summary: An on-chip microwave circulator that is compatible with superconducting devices is a key element for scale-up of superconducting circuits. Previous approaches to integrating circulators on chip involve either external driving that requires extra microwave lines or a strong magnetic field that would compromise superconductivity. Here we report the first proof-of-principle realisation of a passive on-chip circulator which is made from a superconducting loop interrupted by three notionally-identical Josephson junctions.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: An on-chip microwave circulator that is compatible with superconducting devices is a key element for scale-up of superconducting circuits. Previous approaches to integrating circulators on chip involve either external driving that requires extra microwave lines or a strong magnetic field that would compromise superconductivity. Here we report the first proof-of-principle realisation of a passive on-chip circulator which is made from a superconducting loop interrupted by three notionally-identical Josephson junctions and is tuned with only DC control fields. Our experimental results shows evidence for nonreciprocal scattering, and excellent agreement with theoretical simulations. We also present a detailed analysis of quasiparticle tunneling in our device using a hidden Markov model. By reducing the junction asymmetry and utilising the known methods of protection from quasiparticles, we anticipate that Josephson-loop circulator will become ubiquitous in superconducting circuits.

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