Authors
Randy Kwende, Theodore White, Ofer Naaman
Publication date
2023/5/29
Journal
Applied Physics Letters
Volume
122
Issue
22
Publisher
AIP Publishing
Description
We demonstrate a 3-port Josephson parametric circulator matched to 50X using second order Chebyshev networks. The device notably operates with two of its signal ports at the same frequency and uses only two out-of-phase pumps at a single frequency. As a consequence, when operated as an isolator, it does not require phase coherence between the pumps and the signal, thus simplifying the requirements for its integration into standard dispersive qubit readout setups. The device utilizes parametric couplers based on a balanced bridge of rf-superconducting quantum interference device arrays, which offer purely parametric coupling and high dynamic range. We characterize the device by measuring its full 3 Â3 S-matrix as a function of frequency and the relative phase between the two pumps. We find up to 15dB nonreciprocity over a 200 MHz signal band, port match better than 10 dB, low insertion loss of 0.6 …
Total citations
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