Related papers: A time-dependent harmonic oscillator with two frequency jumps: an exact algebraic solution

A time-dependent harmonic oscillator with two frequency jumps: an exact algebraic solution

URL: http://arxiv.org/abs/2004.10852v1
Date: Tue, 14 Apr 2020 15:12:44 GMT
Title: A time-dependent harmonic oscillator with two frequency jumps: an exact algebraic solution
Authors: D. M. Tibaduiza, L. Pires, A. L. C. Rego, D. Szilard, C. A. D. Zarro, C. Farina
Abstract summary: We consider a harmonic oscillator (HO) with a time dependent frequency which undergoes two successive abrupt changes. By assumption, the HO starts in its fundamental state with frequency omega_0, then, at t = 0, its frequency suddenly increases to omega_1 and, after a finite time interval tau, it comes back to its original value omega_0. We compute explicitly the corresponding squeezing parameter (SP) relative to the initial state at an arbitrary instant and show that, surprisingly, it exhibits oscillations after the first frequency jump.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We consider a harmonic oscillator (HO) with a time dependent frequency which undergoes two successive abrupt changes. By assumption, the HO starts in its fundamental state with frequency \omega_{0}, then, at t = 0, its frequency suddenly increases to \omega_{1} and, after a finite time interval \tau, it comes back to its original value \omega_{0}. Contrary to what one could naively think, this problem is a quite non-trivial one. Using algebraic methods we obtain its exact analytical solution and show that at any time t > 0 the HO is in a squeezed state. We compute explicitly the corresponding squeezing parameter (SP) relative to the initial state at an arbitrary instant and show that, surprisingly, it exhibits oscillations after the first frequency jump (from \omega_{0} to \omega_{1}), remaining constant after the second jump (from \omega_{1} back to \omega_{0}). We also compute the time evolution of the variance of a quadrature. Last, but not least, we calculate the vacuum (fundamental state) persistence probability amplitude of the HO, as well as its transition probability amplitude for any excited state.

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