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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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When does noise increase the quantum capacity?

Fernando G S L Brandão1, Jonathan Oppenheim, Sergii Strelchuk

  • 1Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, Caixa Postal 702, 30123-970 MG, Brazil.

Physical Review Letters
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PubMed
Summary
This summary is machine-generated.

Superactivation allows two quantum channels with no capacity to achieve positive capacity when combined. This effect is demonstrated to be general, even appearing with the depolarizing channel.

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Area of Science:

  • Quantum information science
  • Quantum communication theory

Background:

  • Quantum channels are essential for transmitting quantum information.
  • Some quantum channels possess zero quantum capacity, limiting their usefulness.
  • Superactivation is a phenomenon where combining zero-capacity channels yields positive capacity.

Purpose of the Study:

  • To demonstrate superactivation for a broad range of inequivalent quantum channels.
  • To investigate superactivation when channel uncertainty exists.
  • To explore the relationship between channel mixing entropy and capacity bounds.

Main Methods:

  • Analysis of superactivation for various inequivalent quantum channels.
  • Consideration of scenarios with sender ignorance regarding channel application.
  • Mathematical derivation of capacity lower bounds based on entropy of mixing.

Main Results:

  • Superactivation is shown to exist for a wide class of inequivalent, non-simulating channels.
  • In cases of channel uncertainty, increased entropy of mixing can enhance the capacity lower bound.
  • Superactivation is demonstrated using the depolarizing channel, indicating its generic nature.

Conclusions:

  • Superactivation is a robust phenomenon applicable to diverse quantum channels.
  • Uncertainty in channel selection can be leveraged to improve communication capacity.
  • The depolarizing channel serves as a concrete example of generic superactivation.