Private and Quantum Capacities of More Capable and Less Noisy Quantum Channels

Details Private and Quantum Capacities of More Capable and Less Noisy Quantum Channels Private and Quantum Capacities of More Capable and Less Noisy Quantum Channels

2011-10-26

arxiv.org/abs/1110.5746v3

Phys. Rev. A 85, 012326 (2012)

Physics

Quantum Physics

6 pages, 1 figure, In v2, fig 1 is modified because fig 1 in v1 incorrectly stated that the degradable class is included in th

Scientific paper

10.1103/PhysRevA.85.012326

Two new classes of quantum channels, which we call more capable and less noisy, are introduced. The more capable class consists of channels such that the quantum capacities of the complementary channels to the environments are zero. The less noisy class consists of channels such that the private capacities of the complementary channels to the environment are zero. For the more capable class, it is clarified that the private capacity and quantum capacity coincide. For the less noisy class, it is clarified that the private capacity and quantum capacity can be single letter characterized.

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