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SUMMARY:Three-party reference frame independent quantum key distribution w
 ith an imperfect source
DTSTART;VALUE=DATE-TIME:20210726T101500Z
DTEND;VALUE=DATE-TIME:20210726T103000Z
DTSTAMP;VALUE=DATE-TIME:20260417T061527Z
UID:indico-contribution-7021@events.saip.org.za
DESCRIPTION:Speakers: Comfort Sekga (Department of Physics and Astronomy\,
  Botswana International University fo Science and Technology\, Private Bag
  16 Palapye\, Botswana)\nTraditionally\, quantum key distribution (QKD) is
  used for sharing secret key between two distant authorized participants w
 ith unconditional security. Here\, we extend the reach of QKD by proposing
  a reference frame independent quantum key distribution (RFI-QKD) which al
 lows 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 tolera
 nt technique proposed by Tamaki et al. [Phys. Rev. A 90\, 052314 (2014)]  
 in our security proof\, which makes the proposed protocol suitable for pra
 ctical applications. In addition\, we derive bounds of the proposed RFI-QK
 D protocol by considering finite-size key security analysis against gener
 al attacks in the presence of statistical fluctuations. The simulation re
 sults show that the performance of RFI-QKD with an imperfect source is com
 parable to that of RFI-QKD with a perfect source. Also\, we investigated t
 he 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 prot
 ocol is not heavily affected by an increase in misalignment of reference 
 frames as the achievable transmission distances are still comparable to th
 e case where there is no misalignment in reference frames (when 𝛽 = 0).
   The proposed protocol has immediate application in quantum network scena
 rios such as web conferences and online courses\, where there are more tha
 n two users who need to share keys.\n\nhttps://events.saip.org.za/event/20
 6/contributions/7021/
LOCATION:North-West University Potchefstroom Campus
URL:https://events.saip.org.za/event/206/contributions/7021/
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