1209.5545 (Lin Zhang)

Structure of states saturating an another version of strong
subadditivity    [PDF]

Lin Zhang

Strong subadditivity inequality of quantum entropy, proved by Lieb and Ruskai, is a powerful tool in quantum information theory. The fact that the strong subadditivity inequality saturated only by a so-called Markov states is obtained in the recent literature [P. Hayden et al., Commun. Math. Phys. 246, 359 (2004).]. In this report, we will give a characterization to an another equivalent version of strong subadditivity inequality. The possible applications are discussed.

View original: http://arxiv.org/abs/1209.5545