Wenqu Xu
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View article: Superconducting Transmon Qubits with the Niobium-buffered α-Tantalum on the Sapphire Substrates
Superconducting Transmon Qubits with the Niobium-buffered α-Tantalum on the Sapphire Substrates Open
Tantalum (Ta) is a promising material for superconducting qubits due to its stable chemical properties, formation of a single oxide, and resistance to reaction with other substances. However, achieving the desired α-Ta typically requires h…
View article: Manipulations of a transmon qubit with a null-biased electro-optic fiber link
Manipulations of a transmon qubit with a null-biased electro-optic fiber link Open
In recent years, significant progress has been made in the field of superconducting quantum circuits, particularly in improving the complexity of quantum processors for large-scale quantum computing and quantum simulation tasks. To enable …
View article: Niobium-buffered tantalum for a superconducting fluxonium qubit
Niobium-buffered tantalum for a superconducting fluxonium qubit Open
We use a magnetron sputtering system to grow a tantalum film on a sapphire substrate with a niobium buffer layer at room temperature. The tantalum film is in α -phase, which is preferred for superconducting quantum devices. We fabricate a …
View article: Compact superconducting transmon qubit circuits made of ultrathin NbN
Compact superconducting transmon qubit circuits made of ultrathin NbN Open
We design and fabricate a compact superconducting qubit circuit made of nano-thick NbN film on a high-resistivity silicon substrate, carrying seven transmon qubits. By comparing with the conventional superconducting qubit circuits made of …