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Entanglement-assisted communication in the absence of shared reference frame

Beheshti, A ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevA.99.042330
  3. Publisher: American Physical Society , 2019
  4. Abstract:
  5. Alice wants to convey the value of a parameter to Bob with whom she does not share a reference frame. What physical object can she use for this task? Shall she encode this value into the angle between two physical vectors such as the angle between two spins? Can she benefit from using entanglement? We investigate these questions here and show that an entangled state of two qubits has three parameters that are invariant under changes of the reference frame. We also calculate for specific examples the average information gain for different circumstances, where one of these parameters is used for communication. We compare our result with the special case of separable states and find that entanglement enhances the information gain
  6. Keywords:
  7. Average information ; Entangled state ; Information gain ; Physical objects ; Reference frame ; Separable state ; Three parameters ; Quantum entanglement
  8. Source: Physical Review A ; Volume 99, Issue 4 , 2019 ; 24699926 (ISSN)
  9. URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.99.042330