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Increasing the Fidelity of Qubit Operations
Superconducting qubits are promising for quantum computing, but further improvements in qubit characteristics are necessary. Here the authors report a high coherence transmon qubit with energy relaxation and echo dephasing times reaching up to 0.67 milliseconds and 1.06 microseconds, respectively.
We report in detail our design, fabrication process, and measurement setup to facilitate the reproduction and wide adoption of high-coherence transmon qubits in the academia and industry. After the argon milling, the sample is transferred back to the oxidation/evaporation chamber, where we deposit the connecting leads between the junction and the Nb pads in three steps with 30/60/60-nm thicknesses, θ= 45° tilt and ϕ= 180°/0°/180° planetary angles. We directly generate the qubit control and readout signals without any analog mixers by using a Xilinx RFSoC evaluation board with QICK firmware 35, 36 locked to a Rb frequency standard.
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