General solution of the time evolution of two interacting harmonic oscillators

David Edward Bruschi*, G. S. Paraoanu, Ivette Fuentes, Frank K. Wilhelm, Andreas W. Schell

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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We study the time evolution of an ideal system composed of two harmonic oscillators coupled through a quadratic Hamiltonian with arbitrary interaction strength. We solve its dynamics analytically by employing tools from symplectic geometry. In particular, we use this result to completely characterize the dynamics of the two oscillators interacting in the ultrastrong-coupling regime with additional single-mode squeezing on both oscillators, as well as higher-order terms. Furthermore, we compute quantities of interest, such as the average number of excitations and the correlations that are established between the two subsystems due to the evolution. We find that this model predicts a second-order phase transition and we compute the critical exponents and the critical value. We also provide an exact decoupling of the time evolution in terms of simple quantum optical operations, which can be used for practical implementations and studies. Finally, we show how our techniques can be extended to include more oscillators and higher-order interactions.

Original languageEnglish
Article number023707
Number of pages13
JournalPhysical Review A
Issue number2
Publication statusPublished - 11 Feb 2021
MoE publication typeA1 Journal article-refereed


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