Quantum coherence of Gaussian states
  We introduce a geometric quantification of quantum coherence in single-mode Gaussian states and we investigate the behavior of distance measures as functions of different physical parameters. In the case of squeezed thermal states, we observe that re-quantization yields an effect of noise-enhanced quantum coherence for increasing thermal photon number. 
Daniela Buono, Gaetano Nocerino, Giuseppe Petrillo, Gianpaolo Torre,   Giuseppe Zonzo, Fabrizio Illuminati
quant-ph cond-mat.other math-ph math.MP