Design of an On-Chip Superconducting Microwave Circulator with Octave Bandwidth
Benjamin J. Chapman, Eric I. Rosenthal, K. W. Lehnert
DOI 10.1103/PhysRevApplied.11.044048 · Physical Review Applied
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Abstract
We present a design for a superconducting, on-chip circulator composed of dynamically modulated transfer switches and delays. Design goals are set for the multiplexed readout of superconducting qubits. Simulations of the device show that it allows for low-loss circulation (insertion loss <0.35 dB and isolation >20 dB) over an instantaneous bandwidth of 2.3 GHz. This design improves on the bandwidth of previous superconducting circulators by more than an order of magnitude, making it ideal for integration with broadband quantum-limited amplifiers.
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