High-fidelity, high-scalability two-qubit gate scheme for superconducting qubits

• URL: http://arxiv.org/abs/2006.11860v2
• Date: Tue, 22 Dec 2020 08:10:14 GMT
• Title: High-fidelity, high-scalability two-qubit gate scheme for superconducting qubits
• Authors: Yuan Xu, Ji Chu, Jiahao Yuan, Jiawei Qiu, Yuxuan Zhou, Libo Zhang, Xinsheng Tan, Yang Yu, Song Liu, Jian Li, Fei Yan, Dapeng Yu
• Abstract summary: We experimentally demonstrate a new two-qubit gate scheme that exploits fixed-frequency qubits and a tunable coupler in a superconducting quantum circuit. The scheme requires less control lines, reduces crosstalk effect, simplifies calibration procedures, yet produces a controlled-Z gate in 30ns with a high fidelity of 99.5%. Our demonstration paves the way for large-scale implementation of high-fidelity quantum operations.
• Score: 16.01171409402694
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: High-quality two-qubit gate operations are crucial for scalable quantum information processing. Often, the gate fidelity is compromised when the system becomes more integrated. Therefore, a low-error-rate, easy-to-scale two-qubit gate scheme is highly desirable. Here, we experimentally demonstrate a new two-qubit gate scheme that exploits fixed-frequency qubits and a tunable coupler in a superconducting quantum circuit. The scheme requires less control lines, reduces crosstalk effect, simplifies calibration procedures, yet produces a controlled-Z gate in 30ns with a high fidelity of 99.5%, derived from the interleaved randomized benchmarking method. Error analysis shows that gate errors are mostly coherence limited. Our demonstration paves the way for large-scale implementation of high-fidelity quantum operations.

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