Entanglement induced Sub-Planck structures
arXiv:0704.2677 · doi:10.1103/PhysRevA.78.034101
Abstract
We study Wigner function of a system describing entanglement of two cat-states. Quantum interferece arising due to entanglement is shown to produce sub-Planck structures in the phase-space plots of the Wigner function. Origin of these structures in our case depends on entanglement unlike those in Zurek \cite{Zurek}. It is argued that the entangled cat-states are better suited for carrying out precision measurements.
6 pages 2 figures (revised version include more quantitative discussion)