Quantum capacity of a bosonic dephasing channel

Arqand, A ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevA.102.042413
  3. Publisher: American Physical Society , 2020
  4. Abstract:
  5. We study the quantum capacity of a continuous-variable dephasing channel, which is a notable example of a non-Gaussian quantum channel. We prove that a single-letter formula applies. The optimal input state is found to be diagonal in the Fock basis and with a distribution that is a discrete version of a Gaussian. We discuss how its mean and variance are related to the dephasing rate and input energy. We then show that by increasing the input energy, the capacity saturates to a finite value. We also show that it decays exponentially for large values of dephasing rates. © 2020 American Physical Society
  6. Keywords:
  7. Communication channels (information theory) ; Continuous variables ; Dephasing channel ; Dephasing rates ; Gaussians ; Input energy ; Input state ; Non-Gaussian ; Quantum capacity ; Channel capacity
  8. Source: Physical Review A ; Volume 102, Issue 4 , 2020
  9. URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.102.042413