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He later broke down when speaking to reporters in the city of Hefei.

Researchers from the University of Turku, Finland, and the University of Science and Technology of China, Hefei, have now proposed a theoretical idea and made corresponding experiments to overcome this problem.

"While we have done numerous experiments on different facets of quantum physics with photons in our laboratory, it was very thrilling and rewarding to see this very challenging teleportation experiment successfully completed," says Dr Zhao-Di Liu from the University of Science and Technology of China, Hefei.

"This is a significant proof-of-principle experiment in the context of one of the most important quantum protocols," says Professor Chuan-Feng Li from the University of Science and Technology of China, Hefei.

Ultramodern factories churn out electric cars and solar panels in Hefei, an industrial center in the heart of central China.