Fig. 2: Classical models in prepare-and-measure scenarios. | Nature Communications

Fig. 2: Classical models in prepare-and-measure scenarios.

From: Operationally classical simulation of quantum states

Fig. 2

λ is distributed between Alice and Bob. The existence of a classical model for Alice’s preparations allows Bob to know the basis in which her quantum states are diagonal, independently of her input x. Then, any quantum correlation statistics p(b∣x, y) can be simulated sending a classical message limited to a d-valued alphabet.

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