Multiphoton resonance in a driven Kerr oscillator in presence of high-order nonlinearities

TL;DR

This paper investigates how high-order nonlinearities affect multiphoton resonance in a driven Kerr oscillator, revealing fine structures and tunneling effects that influence stationary state occupations.

Contribution

It introduces a detailed analysis of the impact of high-order nonlinearities on multiphoton resonance and tunneling phenomena in driven Kerr oscillators, including derivation of the tunneling term from the quantum master equation.

Findings

High-order nonlinearities cause additional fine structure in resonance peaks.

Tunneling significantly affects system kinetics within certain quasienergy domains.

A tunneling term in the Fokker-Planck equation was derived from the quantum master equation.

Abstract

We considered the multiphoton resonance in the periodically driven quantum oscillator with Kerr nonlinearity in the presence of weak high-order nonlinearities. Multiphoton resonance leads to the emergence of peaks and dips in the dependence of the stationary occupations of the stable states on detuning. We demonstrated that due to high-order nonlinearities, these peaks and dips acquire additional fine structure and split into several closely spaced ones. Quasiclassically, multiphoton resonance is treated as tunneling between the regions of the oscillator phase portrait, and the fine structure of the multiphoton resonance is a consequence of a special quasienergy dependence of the tunneling rate between different regions of the classical phase portrait. For different values of damping and high-order nonlinearity coefficients, we identified the domain of quasienergies where tunneling strongly influences the system kinetics. The corresponding tunneling term in the Fokker-Planck equation in quasienergy space was derived directly from the quantum master equation.