Passive superconducting circulator on a chip

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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• Lecture Notes on Quantum Electrical Circuits
• Toolbox for nonreciprocal dispersive models in circuit QED
• Applications of Superconductor-Normal Metal Interfaces
• Dressed Interference in Giant Superatoms: Entanglement Generation and Transfer
• Thermal junctions controlled with Aharonov-Bohm phases
• Controllable non-Hermitian qubit-qubit Coupling in Superconducting quantum Circuit
• Flying-cat parity checks for quantum error correction
• Microwave Circulation in an Extended Josephson Junction Ring