首页|Experimental observation of spontaneous symmetry breaking in a quantum phase transition

Experimental observation of spontaneous symmetry breaking in a quantum phase transition

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Spontaneous symmetry breaking(SSB)plays a central role in understanding a large variety of phenomena associated with phase transitions,such as superfluid and superconductivity.So far,the transition from a symmetric vacuum to a macroscopically ordered phase has been substantially explored.The process bridging these two distinct phases is critical to understanding how a classical world emerges from a quantum phase transition,but so far remains unexplored in experiment.We here report an experimental demonstration of such a process with a quantum Rabi model engineered with a superconducting circuit.We move the system from the normal phase to the superradiant phase featuring two symmetry-breaking field components,one of which is observed to emerge as the classical reality.The results demonstrate that the environment-induced decoherence plays a critical role in the SSB.

quantum phase transitionRabi modelspontaneous symmetry breakingsuperconducting circuitSchrödinger cat states

Wen Ning、Ri-Hua Zheng、Jia-Hao Lü、Fan Wu、Zhen-Biao Yang、Shi-Biao Zheng

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Fujian Key Laboratory of Quantum Information and Quantum Optics,College of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China

Hefei National Laboratory,Hefei 230088,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaInnovation Program for Quantum Science and Technology

1187411412274080118751082021ZD0300200

2024

10.1007/s11433-023-2259-1

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(2)
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