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Quantum key distribution breaking limits

The race of distributing provable-secure encryption keys by means of quantum key distribution over ever-increasing distances is on. A surprising development has now led to a new result that may affect how we build future quantum networks.

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Fig. 1: Experimental set-up of twin-field QKD by Minder, Pittaluga and colleagues.


  1. 1.

    Shor, P. W. In Proc. 35th Annu. Symp. Foundations of Computer Sci. 124–134 (IEEE, 1994).

  2. 2.

    Shor, P. W. SIAM J. Comput. 26, 1484–1509 (1997).

    MathSciNet  Article  Google Scholar 

  3. 3.

    Bennett, C. H. & Brassard, G. In Proc. IEEE Int. Conf. Computers, Systems and Signal Processing 175, 8–12 (IEEE, 1984).

  4. 4.

    Bennett, C. H. & Brassard, G. Theor. Comput. Sci. 560, 7–11 (2014).

    Article  Google Scholar 

  5. 5.

    Wootters, W. K. & Zurek, W. H. Nature 299, 802–803 (1982).

    ADS  Article  Google Scholar 

  6. 6.

    Takeoka, M., Guha, S. & Wilde, M. M. Nat. Commun. 5, 5235 (2014).

    ADS  Article  Google Scholar 

  7. 7.

    Pirandola, S., Laurenza, R., Ottaviani, C. & Banchi, L. Nat. Commun. 8, 15043 (2017).

    ADS  Article  Google Scholar 

  8. 8.

    Sangouard, N., Simon, C., de Riedmatten, H. & Gisin, N. Rev. Mod. Phys. 83, 33–80 (2011).

  9. 9.

    Minder, M. et al. Nat. Photon. (2019).

    Article  Google Scholar 

  10. 10.

    Brassard, G., Lütkenhaus, N., Mor, T. & Sanders, B. C. Phys. Rev. Lett. 85, 1330–1333 (2000).

  11. 11.

    Lo, H.-K., Ma, X. & Chen, K. Phys. Rev. Lett. 94, 230504 (2005).

    ADS  Article  Google Scholar 

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Correspondence to Wolfgang Tittel.

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Tittel, W. Quantum key distribution breaking limits. Nat. Photonics 13, 310–311 (2019).

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