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

Greenberger-Horne-Zeilinger (GHZ) states, also known as two-component Schrödinger cats, play vital roles in the foundation of quantum physics and the potential quantum applications. 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 different 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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Publication Details

Journal
Nature Communications
Published
2024-10-11
DOI
https://doi.org/10.1038/s41467-024-53140-5
Citations
32
Primary Topic
Quantum Computing Algorithms and Architecture
Type
article
Field-Weighted Citation Impact
11.12

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article

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

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32 citations
Nature Communications
Quantum Computing Algorithms and Architecture
11.12
article

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

Ziqi Tan, Yiren Zou, Aosai Zhang, Jinfeng Deng, Zhen Wang, Hang Dong, Liangtian Zhao, Chao Song, Tingting Li, Hekang Li, Biao Huang, Yaozu Wu, Liang Xiang, Qiujiang Guo, Zehang Bao, Pengfei Zhang, Yu Gao, Feitong Jin, Fanhao Shen, H. Wang, Xuhao Zhu, Jiarun Zhong, Zitian Zhu, Jiachen Chen, Ke Wang, Zhengyi Cui, Shibo Xu, Xu Zhang, Zixuan Song, Chuanyu Zhang, Ning Wang, Yang-Ren Liu, Jie Hao
article en
32 citations

Abstract

Greenberger-Horne-Zeilinger (GHZ) states, also known as two-component Schrödinger cats, play vital roles in the foundation of quantum physics and the potential quantum applications. 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 different 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.

Nature CommunicationsVol. 15(1)
Chinese Academy of Sciences (CN), Hefei University (CN), Shandong Institute of Automation (CN), Hefei National Center for Physical Sciences at Nanoscale (CN), Kavli Institute for Theoretical Sciences (CN), Zhejiang Lab (CN), University of Chinese Academy of Sciences (CN), Zhejiang University (CN)
National Natural Science Foundation of China, Zhejiang University, National Key Research and Development Program of China, Natural Science Foundation of Zhejiang Province
Openalex Percentile: Top 1%
Quantum Computing Algorithms and Architecture
11.12
DOIOpen Access PDFOpenAlex
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