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What is meant by a "single-letter" expression for the quantum channel capacity?

In a series of individual works, Lloyd, Shor, and then Devetak developed what is known as the "LSD Theorem," which gives a formula for the quantum capacity of a quantum channel. The result ...
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2 votes
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Additivity of degradable and anti-degradable quantum capacities

I have been able to find the answer to this question, so I will post it myself for anyone that would be interested. The result is proven in Useful States and Entanglement Distillation by Leditzky, ...
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