Entanglement and purity of two-mode Gaussian states in noisy channels
arXiv:quant-ph/0310087 · doi:10.1103/PhysRevA.69.022318
Abstract
We study the evolution of purity, entanglement and total correlations of general two--mode Gaussian states of continuous variable systems in arbitrary uncorrelated Gaussian environments. The time evolution of purity, Von Neumann entropy, logarithmic negativity and mutual information is analyzed for a wide range of initial conditions. In general, we find that a local squeezing of the bath leads to a faster degradation of purity and entanglement, while it can help to preserve the mutual information between the modes.
10 pages, 8 figures