Phase-space approach to continuous variable quantum teleportation

The phase-space method is applied for considering continuous variable quantum teleportation. It is found that the continuous variable quantum teleportation transforms the s-parametrized phase-space function of an input state into the (s+delta)-parametrized phase-space function, where the parameter delta is determined by the shared quantum entanglement. It is shown from this result that the Wigner function of the teleported state is always non-negative for F(c)less than or equal to2/3 and the Glauber-Sudarshan P function non-negative for F(c)less than or equal to1/2, where F-c is the fidelity of the coherent-state teleportation. Furthermore the fidelity between input and output states is calculated when Gaussian states are teleported.