Physics – Quantum Physics
Scientific paper
2010-04-30
Z Shadman et al 2010 New J. Phys. 12 073042
Physics
Quantum Physics
22 pages, 5 figures
Scientific paper
We investigate super dense coding in the presence of noise, i.e. the subsystems of the entangled resource state have to pass a noisy unital quantum channel between the sender and the receiver. We discuss explicitly the case of Pauli channels in arbitrary dimension and derive the super dense coding capacity (i.e. the optimal information transfer) for some given resource states. We also study the case that the initial resource state can be chosen: for the qubit depolarizing channel we show that there is a threshold value for the noise parameter, below which the super dense coding protocol is optimized by a maximally entangled initial state, while above the threshold the dense coding capacity for any entangled initial state is smaller than the one for a product state. Finally, we provide an example of a noisy channel where non-unitary pre-processing increases the super dense coding capacity, as compared to only unitary encoding.
Bruss Dagmar
Kampermann Hermann
Macchiavello Chiara
Shadman Zahra
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