Dynamic sensitivity of quantum Rabi model with quantum criticality

• URL: http://arxiv.org/abs/2101.01504v1
• Date: Tue, 5 Jan 2021 13:41:50 GMT
• Title: Dynamic sensitivity of quantum Rabi model with quantum criticality
• Authors: Ying Hu, Jian Huang, Jin-Feng Huang, Qiong-Tao Xie, Jie-Qiao Liao
• Abstract summary: This sensitivity can be detected by introducing an auxiliary two-level atom far-off-resonantly coupled to the cavity field of the quantum Rabi model. We find that when the quantum Rabi model goes through the critical point, the auxiliary atom experiences a sudden decoherence, which can be characterised by a sharp decay of the Loschmidt echo.
• Score: 6.082805992647198
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study the dynamic sensitivity of the quantum Rabi model, which exhibits quantum criticality in the finite-component-system case. This dynamic sensitivity can be detected by introducing an auxiliary two-level atom far-off-resonantly coupled to the cavity field of the quantum Rabi model. We find that when the quantum Rabi model goes through the critical point, the auxiliary atom experiences a sudden decoherence, which can be characterised by a sharp decay of the Loschmidt echo. Our scheme will provide a reliable way to observe quantum phase transition in ultrastrongly coupled quantum systems.

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