Quantum Communication of Relative Parameters in the Absence of Shared Reference Frame

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Beheshti, Ali | 2019

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 52030 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Karimipour, Vahid; Raeisi, Sadegh
Abstract:
Behind almost all of the communication protocols and quantum information processing tasks, there is the assumption of existence of a shared reference frame between the parties. However, it is interesting to ask whether it is really necessitated to have a shared reference frame in order to succeed in these tasks. In this thesis, after investigating the effect of the absence of shared reference frame, classical and quantum communication in the absence of shared frame via spin ./5 particles are reviewed.Then, the concepts of relative and collective parameters of composite systems are discussed and the relative parameters of a general pure two qubit state are characterized.Finally, certain communication protocols which use the relative parameters as the carrier of information in the absence of reference frame are investigated and the efficieny of those parameters are compared. It is shown that using entangled states is far better than product states while communicating via relative parameters
Keywords:
Shared Reference Frame ; Relative Parameter ; Entanglement ; Quantum Communication Channel