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Investigating the Role of Quantum Correlations in Quantum Communication Protocols

Nikaeen, Morteza | 2021

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 55724 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Bahrampour, Alireza
  7. Abstract:
  8. Communication is nothing but making correlation between sent and received data via mediating particles and in quantum communications these are the quantum carriers that create these correlations. Since quantum carriers can be correlated in ways inaccessible to classical carriers, quantum communication protocols can perform tasks that are classically impossible or less efficient. Therefore, it is expected that in a suitable model, the quantum advantage of any quantum communication protocol can be expressed in terms of the quantum correlations of its carriers. Here we consider two quantum communication protocols, namely remote state preparation (RSP) and quantum locking of classical correlations (QLCC), which are the most important communication protocols in the field of information transmission and security, respectively. Then we analyze their performance with an approach based on the resource state correlations. In the case of RSP, the transmission efficiency (TE) of the protocol is considered. First, the previous approaches in evaluating the TE of the protocol in terms of quantum correlations of the resource state is analyzed, criticized and improved. Then, in a new approach the TE of the protocol is obtained in terms of the resource state parameters and results are interpreted and compared with the results of the previous approaches. In the case of QLCC, the structure of general classical-quantum states in which the amount of their unlockable correlations is equal to their quantum correlations is obtained and then the meaning of this equality in the QLCC protocol is explored
  9. Keywords:
  10. Quantum Communication Channel ; Quantum Correlation ; Quantum Discord ; Remote State Preparation ; Classical Correlations Quantum Locking ; Quantum Telecommunication

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