Low-loss on-chip superconducting microwave circulator assisted by shunting capacitors
N. Pradeep Kumar, Dat Thanh Le, Prasanna Pakkiam, Thomas M. Stace, Arkady Fedorov
DOI 10.1103/PhysRevResearch.7.013075 · Physical Review Research
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Ferrite-free circulators that are passive and readily integratable on a chip are highly sought-after in quantum technologies based on superconducting circuits. In our previous work, we implemented such a circulator using a three-Josephson-junction loop that exhibited unambiguous nonreciprocity and signal circulation, but required junction energies to be within 1% of design values. This tolerance is tighter than standard junction fabrication methods provide, so we propose and demonstrate a design improvement that relaxes the required junction fabrication precision, allowing for higher device performance and fabrication yield. Specifically, we introduce large direct capacitive couplings between the waveguides, which based on the modeling we describe here, requires less stringent junction fabrication tolerance. We implement the design, and measure enhanced “circulation fidelity” above 97%, with optimized on-resonance insertion loss of 0.2 dB, isolation of 18 dB, and power reflectance of −15dB, in good agreement with model calculations.
Similar papers
Operating a passive on-chip superconducting circulator: Device control and quasiparticle effects
similarity 0.94Dat Thanh Le et al.
Source status unknown — claims are unverified
Widely Tunable On-Chip Microwave Circulator for Superconducting Quantum Circuits
similarity 0.93Benjamin J. Chapman et al.
Source status unknown — claims are unverified
On-Chip Superconducting Microwave Circulator from Synthetic Rotation
similarity 0.92Joseph Kerckhoff et al.
Source status unknown — claims are unverified
Nonreciprocity and Circulation in a Passive Josephson-Junction Ring
similarity 0.92Arkady Fedorov et al.
Source status unknown — claims are unverified
Widely tunable on-chip microwave circulator for superconducting quantum circuits
similarity 0.91Benjamin J. Chapman et al. · 2017 · arXiv:1707.04565
Source status unknown — claims are unverified
Passive superconducting circulator on a chip
similarity 0.91Rohit Navarathna et al. · 2022 · arXiv:2208.13339
Source status unknown — claims are unverified