Skip to main content
SpringerLink
Log in

Classical correlations can enhance the continuous-variable quantum key distribution

  • Quantum Communication
  • Published:
Optics and Spectroscopy Aims and scope Submit manuscript

Abstract

We address the effect of classical correlations, introduced to a quantum resource used for the continuous-variable quantum key distribution. The set-up is based on an entangled source with two trusted parties performing homodyne measurements on their modes, thus corresponding to the preparation of squeezed states, while one of the modes is traveling to the remote party through lossy and noisy channel. The security of the scheme is considered against individual and collective eavesdropping attacks. It is shown that the classical correlations added to the entangled source increase the performance of the scheme both quantatively in terms of the secure key rate and qualitatively in terms of the security region with respect to the tolerable excess noise for both types of attacks and the improvement is essentially significant for sources possessing low degree of nonclassicality.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. C. H. Bennett and G. Brassard, in Proceedings of the IEEE International Conference on Computers, Systems, and Signal Processing (IEEE, New York, 1984), pp. 175–179; for overview: N. Gisin et al., Rev. Mod. Phys. 74, 145 (2002).

    Google Scholar 

  2. S. L. Braunstein and P. van Loock, Rev. Mod. Phys. 77, 513 (2005).

    Article  MATH  ADS  Google Scholar 

  3. F. Grosshans et al., Nature (London) 421, 238 (2003); F. Grosshans et al., Quantum Inf. Comput. 3, 535 (2003).

    Article  ADS  Google Scholar 

  4. F. Grosshans, Phys. Rev. Lett. 94, 020504 (2005); M. Navascues and A. Acin, Phys. Rev. Lett. 94, 020505 (2005).

    Article  ADS  Google Scholar 

  5. M. Navascues et al., Phys. Rev. Lett. 97, 190502 (2006); R. Garcia-Patron and N. J. Cerf, Phys. Rev. Lett. 97, 190503 (2006).

    Article  ADS  Google Scholar 

  6. J. Lodewyck et al., Phys. Rev. A 72, 050303 (2005); J. Lodewyck et al., Phys. Rev. A 76, 042305 (2007).

    Article  ADS  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Bogolyubov Institute for Theoretical Physics of National Academy of Sciences, Kiev, 03680, Ukraine

    V. Usenko

  2. Department of Optics, Palacký University, 772 07, Olomouc, Czech Republic

    V. Usenko & R. Filip

Authors
  1. V. Usenko
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. R. Filip
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to V. Usenko.

Additional information

The article is published in the original. The essentials of the paper were reported at the 13th International Conference on Quantum Optics and Quantum Information (May 28–June 1, 2010, Kyiv, Ukraine).

Rights and permissions

Reprints and permissions

About this article

Cite this article

Usenko, V., Filip, R. Classical correlations can enhance the continuous-variable quantum key distribution. Opt. Spectrosc. 111, 673–677 (2011). https://doi.org/10.1134/S0030400X11110300

Download citation

  • Received:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1134/S0030400X11110300

Keywords

Search

Navigation