Dynamic sensitivity of quantum Rabi model with quantum criticality

5 Jan 2021  ·  Ying Hu, Jian Huang, Jin-Feng Huang, Qiong-Tao Xie, Jie-Qiao Liao ·

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. read more

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Quantum Physics