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

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

2010-06-10

arxiv.org/abs/1006.1989v2

Phys. Rev. A 82, 025802 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages; 3 figures; to appear in Phys. Rev. A

Scientific paper

10.1103/PhysRevA.82.025802

The nonclassical behaviors 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 solution do not account accurately for nonclassical effects such squeezing. We suggest a new trial wave function and demonstrate that it has an excellent accuracy on the quantum correlation effects as well as on energy.

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