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Volume 564 Issue 7735, 13 December 2018

Quantum networking

The ability to use quantum keys to encrypt communications has matured sufficiently to be used in the real world. However, to date, such quantum key distribution has been limited to communication between just two parties. In this week’s issue, Sören Wengerowsky and his colleagues demonstrate a fully connected quantum network architecture in which one source of entangled photons distributes quantum states to four different users and allows each of them to generate a secret key for secure communication. The researchers say the network will readily scale to accommodate a much larger number of users because no adaptations of the entanglement source are required to add participants. In addition, the network operates in the telecom band and does not require active switching elements, which means it could function at high quantum communication speeds.

Cover image: Murali Krishna/IQOQI

This Week

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News in Focus

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  • Features

    • Scientists in the food industry find diverse roles from mediating public-health scares to perfecting meatless burgers.

      • David Payne
      Career Feature
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  • Communication is key.

    • Victoria Dixon
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Amendments & Corrections

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  • After a roller-coaster ride of hype and disappointment, the decades-long effort to cure diseases by repairing or replacing faulty genes is starting to yield useful treatments. Diseases that have defied treatment could be reversed by a one-time fix to a faulty gene.

    Nature Outlook
  • India’s pharmaceutical sector has long been dominated by major generics manufacturers.

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