Quantum-mechanical entanglement of three1,2 or four3,4 particles has been achieved experimentally, and has been used to demonstrate the extreme contradiction between quantum mechanics and local realism5,6. However, the realization of five-particle entanglement remains an experimental challenge. The ability to manipulate the entanglement of five or more particles is required7,8 for universal quantum error correction. Another key process in distributed quantum information processing9,10, similar to encoding and decoding, is a teleportation protocol11,12 that we term ‘open-destination’ teleportation. An unknown quantum state of a single particle is teleported onto a superposition of N particles; at a later stage, this teleported state can be read out (for further applications) at any of the N particles, by a projection measurement on the remaining particles. Here we report a proof-of-principle demonstration of five-photon entanglement and open-destination teleportation (for N = 3). In the experiment, we use two entangled photon pairs to generate a four-photon entangled state, which is then combined with a single-photon state. Our experimental methods can be used for investigations of measurement-based quantum computation9,10 and multi-party quantum communication13,14.
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This work was supported by the National Natural Science Foundation of China, the Chinese Academy of Sciences, the National Fundamental Research Program and the German Research Foundation (DFG).
The authors declare that they have no competing financial interests.
About this article
Modern Physics Letters A (2019)
Tripartite entanglement and non-locality in three-qubit Greenberger–Horne–Zeilinger states with bit-flip noise
Canadian Journal of Physics (2019)
npj Quantum Information (2019)
Communications in Statistics - Theory and Methods (2019)
Quantum Information Processing (2019)