J un 2 00 8 epl draft Photon and polariton fluctuations in arrays of QED-cavities

@inproceedings{Rossini2008JU2,
  title={J un 2 00 8 epl draft Photon and polariton fluctuations in arrays of QED-cavities},
  author={Davide Rossini and Rosario Fazio and Giuseppe E. Santoro},
  year={2008}
}
We propose to detect the Mott insulator-superfluid quantum phase transition in an array of coupled cavities by studying the polariton and photon fluctuations in a block of linear dimension M (in units of the lattice constant of the array). We explicitly show this for a one-dimensional array; the analysis can be however extended to higher dimensions. In the Mott phase polariton fluctuations are independent of the block size. In the superfluid phase they grow logarithmically with M , the… CONTINUE READING