Abstract
We suggest an experimentally realizable scheme to test entanglement of a mixed Gaussian continuous-variable state. We find that the entanglement condition is simplified for the family of Gaussian states which are relevant to experimental realization. The entanglement condition is then shown to be directly related to joint homodyne measurements. We show how robust the proposed test of entanglement is against imperfect detection efficiency.
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Lee, J., Lee, S. & Kim, M.S. Wigner function to test entanglement for continuous variables. Acta Phys. Hung. B 20, 81–86 (2004). https://doi.org/10.1556/APH.20.2004.1-2.15
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DOI: https://doi.org/10.1556/APH.20.2004.1-2.15