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    In landmark experiment, scientists beam back 'entangled' photons from space

    Xinhua | Updated: 2017-06-16 14:57

    In landmark experiment, scientists beam back 'entangled' photons from space

    The photo shows Pan Jianwei's team with artist's rendering of satellite Micius. [Photo provided by Pan Jianwei to Xinhua]

    GIANT STEP

    An immediate application of distributed entangled photons, said Pan, is for entanglement-based quantum key distribution to establish secure keys for quantum communication. Another is to exploit distributed entanglement to perform a variant of quantum teleportation protocol for remote preparation and control of quantum states.

    According to Pan, peer reviewers of the paper praised his work as "a major technical accomplishment with potential practical applications as well as being of fundamental scientific importance" that "will have a very large impact, both within the scientific community and in the grand public."

    A number of experts spoke highly of the new achievement from China.

    This demonstration of the photon entanglement distribution from a satellite to very distant ground bases is "a giant step" forward in quantum information and quantum networking development, Alexander Sergienko, a quantum physicist at Boston University, told Xinhua.

    "This is a heroic experiment because so many detrimental factors were working against researchers (and) attempting to destroy a quantum nature of the photonic entanglement in this landmark experiment," Sergienko said. "It is hard to overestimate the impact of this result on the development of modern quantum physics."

    "Chinese researchers deserve a greatest praise and acknowledgement of their skills, persistence, and devotion to science," said Sergienko.

    Seth Lloyd, director of the Center for Extreme Quantum Information Theory at the Massachusetts Institute of Technology, expressed similar views, calling this work "a true breakthrough" in the technology of entanglement distribution.

    "The experiment shows that long-range quantum communication is indeed technologically feasible and holds out the promise of the construction of long-range quantum communication networks in the near future," Lloyd told Xinhua.

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