103 citations · 470 across the 18 of their papers we have counts for
18 papers
Identification and Mitigation of Conducting Package Losses for Quantum Superconducting Devices
Yizhou Huang, Yi-Hsiang Huang, Haozhi Wang +4
Low-loss superconducting rf devices are required when used for quantum computation. Here, we present a series of measurements and simulations showing that conducting losses in the…
Characterization of Asymmetric Gap-Engineered Josephson Junctions and 3D Transmon Qubits
Zach Steffen, S. K. Dutta, Haozhi Wang +6
We have fabricated and characterized asymmetric gap-engineered junctions and transmon devices. To create Josephson junctions with asymmetric gaps, Ti was used to proximitize and lo…
Long-lived transmons with different electrode layouts
Kungang Li, S. K. Dutta, Zachary Steffen +6
To test the contribution of non-equilibrium quasiparticles to qubit relaxation, we have repeatedly measured the relaxation time T_1 in Al/AlOx/Al transmons with electrodes that hav…
Implementation of a generalized CNOT gate between fixed-frequency transmons
Shavindra P. Premaratne, Jen-Hao Yeh, F. C. Wellstood +1
We have embedded two fixed-frequency Al/AlO/Al transmons, with ground-to-excited transition frequencies at 6.0714 GHz and 6.7543 GHz, in a single 3D Al cavity with a…
Hot electron heatsinks for microwave attenuators below 100 mK
Jen-Hao Yeh, Rui Zhang, Shavindra Premaratne +3
We demonstrate improvements to the cooling power of broad bandwidth (10 GHz) microwave attenuators designed for operation at temperatures below 100 mK. By interleaving 9-m thick…
Microwave attenuators for use with quantum devices below 100 mK
Jen-Hao Yeh, Jay LeFebvre, Shavindra Premaratne +2
To reduce the level of thermally generated electrical noise transmitted to superconducting quantum devices operating at 20 mK, we have developed thin-film microwave power attenuato…