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Abstract
For the first time, quantum entangled particles of light have been transmitted through water--a step towards using lasers to send underwater messages that are impossible to intercept. Now Xianmin Jin and his colleagues at Shanghai Jiao Tong University in China have been able to transmit entangled photons through a 3-meter-long container of sea water without disturbing their quantum link. As the first experiment of its kind, it is not clear whether this will be enough to build a communications system. But Jin says this is only the beginning. His calculations suggest that it should be possible to transmit through nearly 900 meters of water.
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