aiqbench takeQuantum Computing

Researchers at Zhejiang University have demonstrated that spectral collapse in the anisotropic two-photon quantum Rabi model can indeed drive a continuous quantum phase transition, overturning previous assumptions about energy gap persistence. By identifying a specific critical qubit frequency coupled with single soft modes, the study establishes a new pathway to experimentally accessible quantum criticality within this universality class. This finding expands the theoretical landscape for observing quantum phase transitions in systems governed by anisotropic interactions.

Source coveringQuantum Zeitgeist

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Spectral collapse—once thought impossible—now signals quantum criticality

Quantum ZeitgeistSeptember 17, 20266 min read

Researchers found that spectral collapse in the two-photon quantum Rabi model, previously thought impossible to link to criticality, does signal a quantum phase transition.

Jiong Li, Jun-Ling Wang, Qing-Hu Chen, and Hai-Qing Lin of Zhejiang University report that spectral collapse, long considered incapable of establishing quantum criticality due to a persisting lowest excitation gap, can indeed signal a continuous quantum phase transition. Their work demonstrates this occurs at a specific qubit frequency within the anisotropic two-photon quantum Rabi model, governed by a single soft mode. The researchers found the same-parity gap, set by the vanishing effective oscillator frequency, closes with an exponent of zν = 1/2, placing the system in the same universality class as the standard quantum Rabi model and establishing spectral collapse as a potential path to experimentally accessible quantum criticality. Anisotropic interactions…

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