Quadrature Uncertainty and Information Entropy of Quantum Elliptical   Vortex States
  We study the quadrature uncertainty of the quantum elliptical vortex state using the associated Wigner function. Deviations from the minimum uncertainty states were observed due to the absence of the Gaussian nature. In our study of the entropy, we noticed that with increasing vorticity, entropy increases for both the modes. We further observed that, there exists an optimum value of ellipticity which gives rise to maximum entanglement of the two modes of the quantum elliptical vortex states. A further increase in ellipticity reduces the entropy thereby resulting in a loss of information carrying capacity. We check the validity of the entropic inequality relations, namely the subaddivity and the Araki-Lieb inequality. The later was satisfied only for a very small range of the ellipticity of the vortex while the former seemed to be valid at all values. 
Anindya Banerji, Prasanta K. Panigrahi, Ravindra Pratap Singh, Saurav   Chowdhury, Abir Bandyopadhyay
quant-ph math-ph math.MP physics.optics