Ah ha! Yes, I thought so. “A decoupling lemma” “The first of several lemmas that will be used to prove the quantum capacity theorem concerns a phenomenon known as decoupling. Informally speaking, this is the phenomenon whereby the action of a sufficiently noisy channel on a randomly chosen subspace of its input space can be expected not only to destroy entanglement with a secondary system, but to destroy classical correlations as well. The lemma that follows proves a fact along these lines that is specialized to the task at hand. “

Ah ha! Yes, I thought so.
 
“A decoupling lemma”
“The first of several lemmas that will be used to prove the quantum capacity theorem concerns a phenomenon known as decoupling. Informally speaking, this is the phenomenon whereby the action of a sufficiently noisy channel on a randomly chosen subspace of its input space can be expected not only to destroy entanglement with a secondary system, but to destroy classical correlations as well. The lemma that follows proves a fact along these lines that is specialized to the task at hand. “
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