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Feedforward-assisted coherent-state comparison amplifier

Bathaee, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevA.100.043809
  3. Publisher: American Physical Society , 2019
  4. Abstract:
  5. Quantum optical coherent-state comparison amplifiers are nondeterministic devices which can amplify rather noiselessly a weak coherent state with an unknown phase from a finite discrete set. The high fidelity and high success probability of this amplifier are accomplished by a comparison stage and some photon subtraction stages. Due to the heralding nature of these amplifiers, they work part of the time. Here, we propose a feedforward protocol to increase the heralded times by correcting the incorrect guess. Hence, we enhance the fidelity and success probability more. Finally, the schematic experimental configuration of the feedforward-assisted coherent-state comparison amplifier is proposed. © 2019 American Physical Society
  6. Keywords:
  7. Coherent state ; Discrete sets ; Feed-Forward ; High-fidelity ; Photon subtractions ; Weak coherent state ; Quantum theory
  8. Source: Physical Review A ; Volume 100, Issue 4 , 2019 ; 24699926 (ISSN)
  9. URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.100.043809