Experimental demonstration of spontaneous symmetry breaking with emergent multi-qubit entanglement
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866910922078945280 |
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| author | Zheng, Ri-Hua Ning, Wen Lü, Jia-Hao Yu, Xue-Jia Wu, Fan Deng, Cheng-Lin Yang, Zhen-Biao Xu, Kai Zheng, Dongning Fan, Heng Zheng, Shi-Biao |
| author_facet | Zheng, Ri-Hua Ning, Wen Lü, Jia-Hao Yu, Xue-Jia Wu, Fan Deng, Cheng-Lin Yang, Zhen-Biao Xu, Kai Zheng, Dongning Fan, Heng Zheng, Shi-Biao |
| contents | Spontaneous symmetry breaking (SSB) is crucial to the occurrence of phase transitions. Once a phase transition occurs, a quantum system presents degenerate eigenstates that lack the symmetry of the Hamiltonian. After crossing the critical point, the system is essentially evolved to a quantum superposition of these eigenstates until decoherence sets in. Despite the fundamental importance and potential applications in quantum technologies, such quantum-mechanical SSB phenomena have not been experimentally explored in many-body systems. We here present an experimental demonstration of the SSB process in the Lipkin-Meshkov-Glick model, governed by the competition between the individual driving and intra-qubit interaction. The model is realized in a circuit quantum electrodynamics system, where 6 Xmon qubits are coupled in an all-to-all manner through virtual photon exchange mediated by a resonator. The observed nonclassical correlations among these qubits in the symmetry-breaking region go beyond the conventional description of SSB, shedding new light on phase transitions for quantum many-body systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_12567 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Experimental demonstration of spontaneous symmetry breaking with emergent multi-qubit entanglement Zheng, Ri-Hua Ning, Wen Lü, Jia-Hao Yu, Xue-Jia Wu, Fan Deng, Cheng-Lin Yang, Zhen-Biao Xu, Kai Zheng, Dongning Fan, Heng Zheng, Shi-Biao Quantum Physics Spontaneous symmetry breaking (SSB) is crucial to the occurrence of phase transitions. Once a phase transition occurs, a quantum system presents degenerate eigenstates that lack the symmetry of the Hamiltonian. After crossing the critical point, the system is essentially evolved to a quantum superposition of these eigenstates until decoherence sets in. Despite the fundamental importance and potential applications in quantum technologies, such quantum-mechanical SSB phenomena have not been experimentally explored in many-body systems. We here present an experimental demonstration of the SSB process in the Lipkin-Meshkov-Glick model, governed by the competition between the individual driving and intra-qubit interaction. The model is realized in a circuit quantum electrodynamics system, where 6 Xmon qubits are coupled in an all-to-all manner through virtual photon exchange mediated by a resonator. The observed nonclassical correlations among these qubits in the symmetry-breaking region go beyond the conventional description of SSB, shedding new light on phase transitions for quantum many-body systems. |
| title | Experimental demonstration of spontaneous symmetry breaking with emergent multi-qubit entanglement |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2407.12567 |