Non-unitary encoding increases the super dense coding capacity in the presence of noise

IICQI 2010
Talk type: 

We study an important protocol in quantum information processing, namely super dense coding in the presence of noise. We compare the optimal super dense coding capacity with unitary and non-unitary encoding. We show that in the case of non-unitary encoding, the optimal capacity can be reached by preprocessing on the sender's side followed by a unitary encoding. We give examples that preprocessing increases the super dense coding capacity.