Classical simulations of communication channels

Quantum 6, 751 (2022).

https://doi.org/10.22331/q-2022-06-29-751

We investigate whether certain non-classical communication channels can be simulated by a classical channel with a given number of states and a given `amount’ of noise. It is proved that any noisy quantum channel can be simulated by a corresponding classical channel with `the same amount’ of noise. Classical simulations of general probabilistic channels are also studied.