Entanglement swapping of continuous variable using squeezed vacuum states |
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Authors: | Yan Wei and Zhang Wei-Jun |
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Institution: | Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; Department of Physics, Qufu Normal University, Qufu 273165, China |
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Abstract: | We present a realistic scheme for the entanglement swapping of continuous
variable, in which a two-mode squeezed vacuum state serves as a quantum
channel. The position sum and momentum difference of two local modes are
measured. By taking the input entangled state also as a two-mode squeezed
vacuum state, we investigate the average fidelity and the von Neumann
entropy of the output state. The results show that the
perfect teleportation can be
achieved by increasing the squeezing of the quantum channel and that any
nonzero squeezing in both the quantum channel and the input entangled state
is sufficient to swap the entanglement. |
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Keywords: | entanglement swapping continuous variable squeezed
vacuum states |
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