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Experimental quantum teleportation of a two-qubit composite system

Abstract

Quantum teleportation1, a way to transfer the state of a quantum system from one location to another, is central to quantum communication2 and plays an important role in a number of quantum computation protocols3,4,5. Previous experimental demonstrations have been implemented with single photonic6,7,8,9,10,11 or ionic qubits12,13. However, teleportation of single qubits is insufficient for a large-scale realization of quantum communication and computation2,3,4,5. Here, we present the experimental realization of quantum teleportation of a two-qubit composite system. In the experiment, we develop and exploit a six-photon interferometer to teleport an arbitrary polarization state of two photons. The observed teleportation fidelities for different initial states are all well beyond the state estimation limit of 0.40 for a two-qubit system14. Not only does our six-photon interferometer provide an important step towards teleportation of a complex system, it will also enable future experimental investigations on a number of fundamental quantum communication and computation protocols3,15,16,17,18.

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Acknowledgements

This work was supported by the Marie Curie Excellence Grant of the EU and the Alexander von Humboldt Foundation. This work was also supported by the National Natural Science Foundation of China and the Chinese Academy of Sciences.

Author information

Correspondence to Qiang Zhang or Jian-Wei Pan.

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The authors declare no competing financial interests.

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Further reading

Figure 1: Schematic diagram showing the principle of two-qubit quantum teleportation.
Figure 2: A schematic diagram of the experimental setup.
Figure 3: Experimental results for the teleportation of the |χA state and the |χB state.
Figure 4: Experimental results for |χC teleportation.