Control of quantum correlation of high dimensional system in squeezed vacuum reservoir

Abstract

We study the quantum correlation and entanglement for a high-dimensional spin-S system in a squeezed vacuum reservoir. The exact analytical solution is presented, which shows that the decoherence function governs the quantum correlation and quantum entanglement of corresponding dynamical process. The squeezed amplitude parameter for quantum correlation and quantum entanglement has a negative impact in the whole process, the better the squeezing effect, the greater the negative impact. Furthermore, in the super-Ohmic reservoir, the influence of Ohmic parameter on quantum correlation and quantum entanglement can be divided into two regions in terms of the critical value s=2.5⁡. If s<2.5, the decay rate of quantum correlation slows down obviously, and the environmental decoherence effect is much smaller than that of Ohmic and sub-Ohmic reservoirs. On the contrary, if s>2.5, the decay rate of quantum correlation accelerates obviously, and the decoherence effect surpasses the cases of Ohmic and sub-Ohmic reservoirs greatly.