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Superadditivity effects in quantum channels are poorly understood. This study introduces platypus channels, demonstrating superadditivity even between channels with high quantum capacity, revealing it

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Area of Science:

  • Quantum Information Theory
  • Quantum Communication

Background:

  • Capacities of quantum channels are fundamental but poorly understood due to superadditivity.
  • Simple examples of superadditive quantum channels are scarce, hindering research.

Purpose of the Study:

  • To investigate superadditivity phenomena in a novel family of quantum channels, termed platypus channels.
  • To explore the prevalence and conditions under which superadditivity occurs in quantum information theory.

Main Methods:

  • Analysis of a qutrit platypus channel for superadditivity of coherent information with qubit channels.
  • Examination of higher-dimensional platypus channels for superadditivity of quantum capacity with erasure channels.
  • Application of the 'spin-alignment conjecture' to extend results to lower dimensions and broader parameter ranges.

Main Results:

  • Platypus channels exhibit superadditivity of coherent information and quantum capacity.
  • Superadditivity is demonstrated even between two weakly additive channels, each possessing large individual capacity.
  • A single, novel transmission strategy successfully induces superadditivity across all studied platypus channel examples.

Conclusions:

  • Superadditivity in quantum channels is more widespread than previously assumed.
  • Platypus channels provide a versatile framework for studying and demonstrating superadditivity.
  • The findings challenge existing notions about the conditions required for superadditivity, particularly concerning channel capacity.