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On quasi-inversion of quantum channels in 2 and in higher dimensions

Karimipour, V ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1142/S1230161222500147
  3. Publisher: World Scientific , 2022
  4. Abstract:
  5. We review the concept of the quasi-inverse of qubit channels and of higher dimensional channels. Quasi-inverse is a channel which when concatenaded to the original channel, increases its average fidelity in an optimal way. For qubit channels, we fully characterize the quasi-inverse, while for higher dimensional channels, we prove general theorems and provide bounds for the increased average fidelity. Nevertheless, explicit examples are given when exact quasi-inverses can be found. © 2022 World Scientific Publishing Company
  6. Keywords:
  7. Average fidelity ; Quantum channel ; Quasi-inversion
  8. Source: Open Systems and Information Dynamics ; Volume 29, Issue 3 , 2022 ; 12301612 (ISSN)
  9. URL: https://www.worldscientific.com/doi/10.1142/S1230161222500147