Efficient achievability for quantum protocols using decoupling theorems

Proving achievability of protocols in quantum Shannon theory usually does not consider the efficiency at which the goal of the protocol can be achieved. Nevertheless it is known that protocols such as coherent state merging are efficiently achievable at optimal rate. We aim to investigate this fact further in a general one-shot setting, by considering certain classes of decoupling theorems and give exact rates for these classes. Moreover we compare results of general decoupling theorems using Haar distributed unitaries with those using smaller sets of operators, in particular $ε$-approximate 2-designs. We also observe the behavior of our rates in special cases such as $ε$ approaching zero and the asymptotic limit.

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