DYNAMICS OF QUANTUM INTERFEROMETRIC POWER IN GAUSSIAN OPEN SYSTEMS

We describe the dynamics of the interferometric power in a system composed of two bosonic modes immersed in a thermal reservoir, in the framework of the theory of open systems based on completely positive quantum dynamical semi-groups. The time evolution of the interferometric power is described in terms of the covariance matrix for Gaussian initial states. We show that, independent of the initial state, the Gaussian interferometric power is monotonically decreasing in time, and in the limit of large times it asymptotically decreases to a zero value.