Skip to main content

Thank you for visiting You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.

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.

This is a preview of subscription content, access via your institution

Access options

Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.

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


  1. Bennett, C. H. & Brassard, G. in Proc. IEEE Int. Conf. Comp. Syst. Signal Process. 175–179 (IEEE, 1984).

    Google Scholar 

  2. Heisenberg, W. Z. Phys. 43, 172–198 (1927).

    Article  ADS  Google Scholar 

  3. Sasaki, T., Yamamoto, Y. & Koashi, M. Nature 509, 475–478 (2014).

    Article  ADS  Google Scholar 

  4. Wang, S. et al. Nature Photon. 9, 832–836 (2015).

    Article  ADS  Google Scholar 

  5. Takesue, H. et al. Nature Photon. 9, 827–831 (2015).

    Article  ADS  Google Scholar 

  6. Guan, J.-Y. et al. Phys. Rev. Lett. 104, 180502 (2015).

    Article  Google Scholar 

  7. Vernam, G. J. Am. Inst. Electr. Eng. 45, 109–115 (1926).

    Google Scholar 

  8. Scarani, V. et al. Rev. Mod. Phys. 81, 1301 (2009).

    Article  ADS  Google Scholar 

  9. Dixon, A. R., Yuan, Z. L., Dynes, J. F., Sharpe. A. W. & Shields, A. J. Opt. Express 16, 18790–18979 (2008).

    Article  ADS  Google Scholar 

  10. Qiu, J. Nature 508, 441–442 (2014).

    Article  ADS  Google Scholar 

Download references

Author information

Authors and Affiliations


Corresponding authors

Correspondence to Bernd Fröhlich or Zhiliang Yuan.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Fröhlich, B., Yuan, Z. Round-robin with photons. Nature Photon 9, 781–782 (2015).

Download citation

  • Published:

  • Issue Date:

  • DOI:


Quick links

Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing