Creation of Greenberger-Horne-Zeilinger states with thousands of atoms by entanglement amplification

Zhao, Yajuan1,2; Zhang, Rui1,2; Chen, Wenlan1,2,3; Wang, Xiang-Bin1,2,3,4,5,6,7; Hu, Jiazhong1,2,3

2021-02-05

10.1038/s41534-021-00364-8

NPJ QUANTUM INFORMATION   影响因子和分区

2056-6387

We propose an entanglement-creation scheme in a multi-atom ensemble trapped in an optical cavity, named entanglement amplification, converting unentangled states into entangled states and amplifying less-entangled ones to maximally entangled Greenberger-Horne-Zeilinger (GHZ) states whose fidelity is logarithmically dependent on the atom number and robust against common experimental noises. The scheme starts with a multi-atom ensemble initialized in a coherent spin state. By shifting the energy of a particular Dicke state, we break the Hilbert space of the ensemble into two isolated subspaces to tear the coherent spin state into two components so that entanglement is introduced. After that, we utilize the isolated subspaces to further enhance the entanglement by coherently separating the two components. By single-particle Rabi drivings on atoms in a high-finesse optical cavity illuminated by a single-frequency light, 2000-atom GHZ states can be created with a fidelity above 80% in an experimentally achievable system, making resources of ensembles at Heisenberg limit practically available for quantum metrology.

SCI ; EI

英语

通讯

National Natural Science Foundation of China[11474182,11774198,"U1738142"] ; Ministration of Science and Technology of China through The National Key Research and Development Program of China[2017YFA0303901]

Physics

Quantum Science & Technology ; Physics, Applied ; Physics, Atomic, Molecular & Chemical ; Physics, Condensed Matter

WOS:000617529900003

NATURE RESEARCH

20210709904193

Atoms ; Spin dynamics

Atomic and Molecular Physics:931.3 ; Quantum Theory; Quantum Mechanics:931.4

2-s2.0-85100563101

Web of Science

1.Tsinghua Univ, Dept Phys, Beijing, Peoples R China
2.Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing, Peoples R China
3.Frontier Sci Ctr Quantum Informat, Beijing, Peoples R China
4.Univ Sci & Technol China, Synerget Innovat Ctr Quantum Informat & Quantum P, Hefei, Anhui, Peoples R China
5.Jinan Inst Quantum Technol, SAICT, Jinan, Peoples R China
6.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen, Peoples R China
7.Southern Univ Sci & Technol, Phys Dept, Shenzhen, Peoples R China

Zhao, Yajuan,Zhang, Rui,Chen, Wenlan,et al. Creation of Greenberger-Horne-Zeilinger states with thousands of atoms by entanglement amplification[J]. NPJ QUANTUM INFORMATION,2021,7(1).

Zhao, Yajuan,Zhang, Rui,Chen, Wenlan,Wang, Xiang-Bin,&Hu, Jiazhong.(2021).Creation of Greenberger-Horne-Zeilinger states with thousands of atoms by entanglement amplification.NPJ QUANTUM INFORMATION,7(1).

Zhao, Yajuan,et al."Creation of Greenberger-Horne-Zeilinger states with thousands of atoms by entanglement amplification".NPJ QUANTUM INFORMATION 7.1(2021).