Variational study of a two-level system coupled to a harmonic oscillator in an ultrastrong-coupling regime

Myung Joong Hwang, Mahn Soo Choi

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The nonclassical behavior of a two-level system coupled to a harmonic oscillator is investigated in the ultrastrong coupling regime. We revisit the variational solution of the ground state and find that the existing solutions do not account accurately for nonclassical effects such as squeezing. We suggest a trial wave function and demonstrate that it has an excellent accuracy for the quantum correlation effects as well as for the energy.

Original languageEnglish
Article number025802
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume82
Issue number2
DOIs
Publication statusPublished - 2010 Aug 30

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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