Emergent equilibrium and quantum criticality in a two-photon dissipative oscillator
arXiv:2311.00297 · doi:10.1103/PhysRevResearch.7.013061
Abstract
We study the dissipative phase transition in a quantum oscillator with two-photon drive and two-photon dissipation. Using the semi-classical Langevin equation and the Fokker-Plank approach, we construct a theory of non-perturbative quantum fluctuations and go beyond the semi-classical approximation. We demonstrate the mapping of a two-photon quantum dissipative oscillator onto a classical equilibrium model of a nonlinear classical oscillator in a colored-noise environment. Then, we justify the applicability of the Landau theory for a given dissipative phase transition. To do that, we explicitly demonstrate the Boltzmann-like form of stationary distribution function depending on the effective temperature, which is determined by the frequency detuning and the rates of two-photon drive and dissipation. In addition, we provide a description of the quantum critical region and obtain critical exponents that appear to be in very good agreement with numerical simulations.
14 pages, 7 figures
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