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Questions tagged [coherent-information]

For questions regarding coherent information quantity from quantum information theory

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Is it sufficient to assume a constant coherent error?

I've recently started working with quantum errors and noise and came across an intriguing but simple question. When we consider coherent errors in quantum gate operations, it's common to model them as ...
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Prove that the coherent information of an antidegradable channel is equal to zero

I want to show that antidegradable channels have zero coherent information, based on Exercise 13.5.6 in [1]. So the solution should use the following relationship: For Hilbert spaces $R, B, E$, a pure ...
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Does no-cloning imply zero capacity of antidegradable channels?

I read that (paraphrasing, see below) "antidegradable channels have zero capacity because of the no-cloning theorem". Is there a formal derivation of the capacity of an antidegradable ...
forky40's user avatar
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Coherent information is a lower bound of channel capacity. What about coherent information based on Renyi entropies?

It is known that coherent information defined in terms of von Neumann entropies is a lower bound of quantum channel capacity. If we define coherent information in terms of $\alpha$-Renyi entropies, ...
MonteNero's user avatar
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