2020/06/30 by Yuan Xu, Ji Chu, Jiahao Yuan +9 · 3 citations
Computer Science · Engineering · Physics and Astronomy · #Computer science #Controlled NOT gate #Electrical engineering #Electronic engineering #Engineering #Fidelity #Optoelectronics #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum gate #Quantum mechanics #Qubit #Scalability #Telecommunications #Topology (electrical circuits) #quant-ph
paper · pdf · doi:10.1103/physrevlett.125.240503
published as Phys. Rev. Lett. 125, 240503 (2020)
openalex publication_date 2020/12/09 · arxiv created 2020/12/22 · arxiv updated 2020/12/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 cross talk effect, and simplifies calibration procedures, yet produces a controlled-Z gate in 30 ns 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.