Multiplicativity of accessible fidelity and quantumness for sets of quantum states (pp001-011)
        Koenraad M.R. Audenaert, Chris A. Fuchs, C. King, and Andreas Winter
          doi: https://doi.org/10.26421/QIC4.1-1
Abstracts: Two measures of sensitivity to eavesdropping for alphabets of quantum states were recently introduced by Fuchs and Sasaki in quant-ph/0302092. These are the accessible fidelity and quantumness. In this paper we prove an important property of both measures: They are multiplicative under tensor products. The proof in the case of accessible fidelity shows a connection between the measure and characteristics of entanglement-breaking quantum channels.
Key words: multiplicativity, accessible fidelity, quantumness, entanglement, breaking channels