Genuine 12-Qubit Entanglement on a Superconducting Quantum Processor
Ming Gong(University of Science and Technology of China), Ming-Cheng Chen(University of Science and Technology of China), Yarui Zheng(University of Science and Technology of China), Shiyu Wang(University of Science and Technology of China), Chen Zha(University of Science and Technology of China), Huiqiu Deng(University of Science and Technology of China), Zhiguang Yan(University of Science and Technology of China), Hao Rong(University of Science and Technology of China), Yulin Wu(University of Science and Technology of China), Shaowei Li(University of Science and Technology of China), Fusheng Chen(University of Science and Technology of China), Youwei Zhao(University of Science and Technology of China), Futian Liang(University of Science and Technology of China), Jin Lin(University of Science and Technology of China), Yu Xu(University of Science and Technology of China), Cheng Guo(University of Science and Technology of China), Lihua Sun(University of Science and Technology of China), Juno Clark(University of Science and Technology of China), Haohua Wang(Zhejiang University), Cheng-Zhi Peng(University of Science and Technology of China), Chao‐Yang Lu(University of Science and Technology of China), Xiaobo Zhu(University of Science and Technology of China), Jian-Wei Pan(University of Science and Technology of China)
We report the preparation and verification of a genuine 12-qubit entanglement in a superconducting processor. The processor that we designed and fabricated has qubits lying on a 1D chain with relaxation times ranging from 29.6 to 54.6 μs. The fidelity of the 12-qubit entanglement was measured to be above 0.5544±0.0025, exceeding the genuine multipartite entanglement threshold by 21 statistical standard deviations. After thermal cycling, the 12-qubit state fidelity was further improved to be above 0.707±0.008. Our entangling circuit to generate linear cluster states is depth invariant in the number of qubits and uses single- and double-qubit gates instead of collective interactions. Our results are a substantial step towards large-scale random circuit sampling and scalable measurement-based quantum computing.