22-30 July 2021
North-West University
Africa/Johannesburg timezone
More Information Coming Soon

Three-party reference frame independent quantum key distribution with an imperfect source

26 Jul 2021, 12:15
15m
Potchefstroom Campus (North-West University)

Potchefstroom Campus

North-West University

Oral Presentation Track G - Theoretical and Computational Physics Theoretical and Computational Physics

Speaker

Comfort Sekga (Department of Physics and Astronomy, Botswana International University fo Science and Technology, Private Bag 16 Palapye, Botswana)

Description

Traditionally, quantum key distribution (QKD) is used for sharing secret key between two distant authorized participants with unconditional security. Here, we extend the reach of QKD by proposing a reference frame independent quantum key distribution (RFI-QKD) which allows three legitimate parties to share the common secret keys without any alignment of reference frames in their quantum channels. Furthermore, we relax the assumption of perfect state preparation by employing loss tolerant technique proposed by Tamaki et al. [Phys. Rev. A 90, 052314 (2014)] in our security proof, which makes the proposed protocol suitable for practical applications. In addition, we derive bounds of the proposed RFI-QKD protocol by considering finite-size key security analysis against general attacks in the presence of statistical fluctuations. The simulation results show that the performance of RFI-QKD with an imperfect source is comparable to that of RFI-QKD with a perfect source. Also, we investigated the impact of reference frame misalignment on the stability of our protocol for drifting of reference frames by angles 𝛽 = 𝜋/4, 𝜋/6 and 𝛽 = 𝜋/8. Remarkably, our results demonstrate that our proposed protocol is not heavily affected by an increase in misalignment of reference frames as the achievable transmission distances are still comparable to the case where there is no misalignment in reference frames (when 𝛽 = 0). The proposed protocol has immediate application in quantum network scenarios such as web conferences and online courses, where there are more than two users who need to share keys.

Apply to be considered for a student ; award (Yes / No)?

Yes

Level for award;(Hons, MSc, PhD, N/A)?

PhD

Primary authors

Comfort Sekga (Department of Physics and Astronomy, Botswana International University fo Science and Technology, Private Bag 16 Palapye, Botswana) Mhlambululi Mafu (Botswana International University of Science and Technology)

Presentation Materials

Peer reviewing

Paper