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Quantum cryptography

Round-robin with photons

Last year the common notion that signal disturbance has to be monitored in a quantum cryptographic link to guarantee secrecy was challenged by a new protocol. The formidable task of demonstrating it experimentally has now been achieved.

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Figure 1: The principle of round-robin differential phase-shift QKD.

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Correspondence to Bernd Fröhlich or Zhiliang Yuan.

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Fröhlich, B., Yuan, Z. Round-robin with photons. Nature Photon 9, 781–782 (2015). https://doi.org/10.1038/nphoton.2015.230

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