Atom state evolution and collapse in ultracold gases during light scattering into a cavity

I. B. Mekhov, H. Ritsch

Research output

18 Citations (Scopus)


We consider the light scattering from ultracold atoms trapped in an optical lattice inside a cavity. In such a system, both the light and atomic motion should be treated in a fully quantum mechanical way. The unitary evolution of the light-matter quantum state is shown to demonstrate the non-trivial phase dependence, quadratic in the atom number. This is essentially due to the dynamical self-consistent nature of the light modes assumed in our model. The collapse of the quantum state during the photocounting process is analyzed as well. It corresponds to the measurement-induced atom number squeezing. We show that, at the final stage of the state collapse, the shrinking of the width of the atom number distribution behaves exponentially in time. This is much faster than the square root time dependence, obtained for the initial stage of the state collapse. The exponentially fast squeezing appears due to the discrete nature of the atom number distribution.

Original languageEnglish
Pages (from-to)1486-1490
Number of pages5
JournalLaser Physics
Issue number8
Publication statusPublished - Aug 2011

Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Condensed Matter Physics
  • Industrial and Manufacturing Engineering

Fingerprint Dive into the research topics of 'Atom state evolution and collapse in ultracold gases during light scattering into a cavity'. Together they form a unique fingerprint.

Cite this