Creating and controlling global Greenberger-Horne-Zeilinger entanglement on quantum processors

• URL: http://arxiv.org/abs/2401.08284v2
• Date: Sun, 13 Oct 2024 08:36:11 GMT
• Title: Creating and controlling global Greenberger-Horne-Zeilinger entanglement on quantum processors
• Authors: Zehang Bao, Shibo Xu, Zixuan Song, Ke Wang, Liang Xiang, Zitian Zhu, Jiachen Chen, Feitong Jin, Xuhao Zhu, Yu Gao, Yaozu Wu, Chuanyu Zhang, Ning Wang, Yiren Zou, Ziqi Tan, Aosai Zhang, Zhengyi Cui, Fanhao Shen, Jiarun Zhong, Tingting Li, Jinfeng Deng, Xu Zhang, Hang Dong, Pengfei Zhang, Yang-Ren Liu, Liangtian Zhao, Jie Hao, Hekang Li, Zhen Wang, Chao Song, Qiujiang Guo, Biao Huang, H. Wang,
• Abstract summary: Greenberger-Horne-Zeilinger (GHZ) states play vital roles in the foundation of quantum physics. We propose a general strategy for creating, preserving, and manipulating large-scale GHZ entanglement.
• Score: 20.335679096442604
• License:
• Abstract: Greenberger-Horne-Zeilinger (GHZ) states, also known as two-component Schr\"{o}dinger cats, play vital roles in the foundation of quantum physics and, more attractively, in future quantum technologies such as fault-tolerant quantum computation. Enlargement in size and coherent control of GHZ states are both crucial for harnessing entanglement in advanced computational tasks with practical advantages, which unfortunately pose tremendous challenges as GHZ states are vulnerable to noise. Here we propose a general strategy for creating, preserving, and manipulating large-scale GHZ entanglement, and demonstrate a series of experiments underlined by high-fidelity digital quantum circuits. For initialization, we employ a scalable protocol to create genuinely entangled GHZ states with up to 60 qubits, almost doubling the previous size record. For protection, we take a new perspective on discrete time crystals (DTCs), originally for exploring exotic nonequilibrium quantum matters, and embed a GHZ state into the eigenstates of a tailor-made cat scar DTC to extend its lifetime. For manipulation, we switch the DTC eigenstates with in-situ quantum gates to modify the effectiveness of the GHZ protection. Our findings establish a viable path towards coherent operations on large-scale entanglement, and further highlight superconducting processors as a promising platform to explore nonequilibrium quantum matters and emerging applications.

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