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.
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|Publication status||Published - 2010 Aug 30|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics