Effect of dissipative environment on collapses and revivals of a nonlinear quantum oscillator

TL;DR

This paper investigates how dissipation affects the collapse and revival phenomena of wave packets in nonlinear quantum oscillators, revealing conditions where revivals persist despite environmental losses.

Contribution

It introduces analysis of dissipation effects on nonlinear quantum oscillators, including Kerr and higher-order nonlinearities, highlighting regimes with minimal degradation of revivals.

Findings

Partial revivals occur at moderate dissipation levels.

Certain parameter regimes show revivals unaffected by dissipation.

Super revivals are observed with higher-order non-linearity.

Abstract

We study the dissipative dynamics of a wave packet passing through two different non-linear media. The effect of dissipation on the phenomenon of collapses and revivals of a wave packet as it evolves in a Kerr-type non-linear medium (represented by the Hamiltonian $({a}^{\dag} a)^2$) is investigated. We find that partial revivals do take place when dissipation values are moderate. For a certain regime of parameters we find a solution where revivals do not die even in the presence of dissipation and the non-linearity appears to compensate for the energy and coherence loss. We consider the next order non-linearity, represented by the Hamiltonian $({a}^{\dag} a)^3$, where we observe the phenomena of super revivals. The effect of dissipation in this case has an additional feature of number dependence for the displaced number states. While our simulations explore the degree to which the phenomena of collapses and revivals degrades in a dissipative environment, we also discovered the presence of a situation where degradation is minimal.