Abstract
School of Mathematics and Physics, The Queen’s University, Belfast BT7 1NN, United Kingdom(Received 14 November 2003)A pure state decoheres into a mixed state as the system entangles with an environment whichis initially in a pure state. However, it is not de nite that the system becomes entangled with acon ned environment with which it only ever interacts. We investigate the disentangling mecha-nism by considering the quantum correlation between a two-mode squeezed state and a thermalenvironment.
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