Investigation Of Quantum Correlations In Non-Gaussian Continuous Variable

Quantum information theory, information theory integrated quantum theory,has become the most popular areas of physics for its potential value andtheoretical significance. The more general continuous variable systems hasrecently been a rapid development, and it also promote we to understand thenature of quantum effects. Continuous variable quantum information theoryinspired by discrete variables, and from Gaussian system transition to non-Gaussian system. Recently, the understanding of quantum effects has fromquantum entanglement extended to quantum correlation. In this work, we basedJaynes-Cummings model to establish the quantum channel, researched non-classical properties in non-Gaussian continuous variable system.Base on J-C model investigate the entanglement transfer from squeezingoptical field to qubit system, using de-Gaussian operation to obtain non-Gaussianstate, and verify the operation can improve transfer efficiency. Non-Gaussianstate has a stronger inseparability, which can transfer more entanglement andquantum correlation to qubit system, and we also verified that Gaussian quantumdiscord is unsuitable to measure the quantum correlation of non-Gaussian states.We consider the teleportation of continuous variable two-mode entangledstate based on the Braunstein-Kimble protocol, the teleportation of Gaussianstates and non-Gaussian ones are investigated. We find that for the quantumchannel there is a critical value of minimum entanglement required to teleportquantum entanglement, and photon-substracted state can improve bothentanglement transfer and the teleportation fidelity.