High-fidelity teleportation beyond the no-cloning limit and entanglement swapping for continuous variables.

@article{Takei2005HighfidelityTB,
  title={High-fidelity teleportation beyond the no-cloning limit and entanglement swapping for continuous variables.},
  author={Nobuyuki Takei and Hidehiro Yonezawa and Takao Aoki and Akira Furusawa},
  journal={Physical review letters},
  year={2005},
  volume={94 22},
  pages={
          220502
        }
}
We experimentally demonstrate continuous-variable quantum teleportation beyond the no-cloning limit. We teleport a coherent state and achieve the fidelity of 0.70 +/- 0.02 that surpasses the no-cloning limit of 2/3. Surpassing the limit is necessary to transfer the nonclassicality of an input quantum state. By using our high-fidelity teleporter, we demonstrate entanglement swapping, namely, teleportation of quantum entanglement, as an example of transfer of nonclassicality. 

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References

SHOWING 1-10 OF 47 REFERENCES

Unconditional quantum teleportation

TLDR
The first realization of unconditional quantum teleportation where every state entering the device is actually teleported is realized, using squeezed-state entanglement.

Quantum cloning and teleportation criteria for continuous quantum variables

We discuss the criteria presently used for evaluating the efficiency of quantum teleportation schemes for continuous variables. Using an argument based upon the difference between 1-to-2 quantum

Quantum teleportation of light beams

We experimentally demonstrate quantum teleportation for continuous variables using squeezed-state entanglement. The teleportation fidelity for a real experimental system is calculated explicitly,

Experimental quantum teleportation

TLDR
It is shown that during teleportation, one of a pair of entangled photons are subjected to a measurement such that the second photon of the entangled pair acquires the polarization of the initial photon.

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

Experimental investigation of continuous-variable quantum teleportation

We report the experimental demonstration of quantum teleportation of the quadrature amplitudes of a light field. Our experiment was stably locked for long periods, and was analyzed in terms of

Quantum versus classical domains for teleportation with continuous variables

By considering the utilization of a classical channel without quantum entanglement, fidelity Fclassical=1/2 has been established as setting the boundary between classical and quantum domains in the

Experimental demonstration of unconditional entanglement swapping for continuous variables.

The unconditional entanglement swapping for continuous variables is experimentally demonstrated. Two initial entangled states are produced from two nondegenerate optical parametric amplifiers

Deterministic quantum teleportation with atoms

TLDR
Deterministic quantum-state teleportation between a pair of trapped calcium ions is reported, demonstrating unequivocally the quantum nature of the process.

Teleportation with Bright Squeezed Light

We examine the teleportation of continuous quantum variables from a small signal communication point of view. We show that mixed bright squeezed beams can provide the entanglement required for