Transmon qubit with relaxation time exceeding 0.5 milliseconds
By Chenlu Wang, Xuegang Li, Huikai Xu, Zhiyuan Li, Junhua Wang, Zhen Yang, Z. Mi, Xuehui Liang, T. Su, Chuhong Yang and 18 more. 2021
233 citations recorded by the source corpus.
By using the dry etching process of tantalum (Ta) film, we had obtained transmon qubit with the best lifetime (T1) 503 us, suggesting that the dry etching process can be adopted in the following multi-qubit fabrication with Ta film. We also compared the relaxation and coherence times of transmons made with different materials (Ta, Nb and Al) with the same design and fabrication processes of Josephson junction, we found that samples prepared with Ta film had the best performance, followed by those with Al film and Nb film. We inferred that the reason for this difference was due to the different loss of oxide materials located at the metal-air interface.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/96b539630b118e0e4992bf50b2824b9ddf442866
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Citations in the corpus
- High fidelity two-qubit gates on fluxoniums using a tunable coupler (2022, background): “Note that according to equation (6), all the diagonal entries of the transition probability matrix are equal, and are products of functions of φ1, φ2, φ3, and φ4.”