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Illustration de l'actualité : PhD defense Niraj Kumar : Design, analysis and implementation of advanced quantum communication and cryptographic protocols

PhD defense Niraj Kumar : Design, analysis and implementation of advanced quantum communication and cryptographic protocols

mercredi
5
décembre
2018

PhD Comics : I'm defending my thesis, Mom !

Jury

  • M. Antonio Acín, IQFO Barcelona, Reporter
  • M. Nobert Lütkenhaus, IQC Waterloo, Reporter
  • M. David Elkouss, TU Delft, Examinator
  • Mme. Elham Kashefi, Sorbonne Université, Examinator
  • M. Iordanis Kerenidis, Université Paris Diderot, Director of thesis
  • M. Eleni Diamanti, Sorbonne Univerisité, Director of thesis

Abstract

In this thesis we focus on designing protocols for quantum information processing tasks that can be implemented with current photonic technologies. We start by providing the first example of a communication model and a distributed task for which there exists a realistic quantum protocol asymptotically more efficient than any classical protocol, both in terms of communication and information resources. To this end, we extend the recently proposed coherent state mapping for quantum communication protocols, study the use of coherent state fingerprints over multiple channels and show their role in the design of an efficient quantum protocol for estimating the Euclidean distance between two real vectors within a constant factor.