Inspired by Montanaro’s work, we introduce the concept of additivity rates of a quantum channel , which give the first order (linear) term of the minimum output -Rényi entropies of as functions of . We lower bound the additivity rates of arbitrary quantum channels using the operator norms of several interesting matrices including partially transposed Choi matrices. As a direct consequence, we obtain upper bounds for the classical capacity of the channels. We study these matrices for random quantum channels defined by random subspaces of a bipartite tensor product space. A detailed spectral analysis of the relevant random matrix models is performed, and strong convergence towards free probabilistic limits is shown. As a corollary, we compute the threshold for random quantum channels to have the positive partial transpose (PPT) property. We then show that a class of random PPT channels violate generically additivity of the -Rényi entropy for all .
Mots clés : Random matrix, Free Probability, Quantum Channel, Entropy, Additivity
@article{AMBP_2015__22_1_1_0, author = {Fukuda, Motohisa and Nechita, Ion}, title = {Additivity rates and {PPT} property for random quantum channels}, journal = {Annales math\'ematiques Blaise Pascal}, pages = {1--72}, publisher = {Annales math\'ematiques Blaise Pascal}, volume = {22}, number = {1}, year = {2015}, doi = {10.5802/ambp.345}, mrnumber = {3361563}, zbl = {1338.46072}, language = {en}, url = {http://archive.numdam.org/articles/10.5802/ambp.345/} }
TY - JOUR AU - Fukuda, Motohisa AU - Nechita, Ion TI - Additivity rates and PPT property for random quantum channels JO - Annales mathématiques Blaise Pascal PY - 2015 SP - 1 EP - 72 VL - 22 IS - 1 PB - Annales mathématiques Blaise Pascal UR - http://archive.numdam.org/articles/10.5802/ambp.345/ DO - 10.5802/ambp.345 LA - en ID - AMBP_2015__22_1_1_0 ER -
%0 Journal Article %A Fukuda, Motohisa %A Nechita, Ion %T Additivity rates and PPT property for random quantum channels %J Annales mathématiques Blaise Pascal %D 2015 %P 1-72 %V 22 %N 1 %I Annales mathématiques Blaise Pascal %U http://archive.numdam.org/articles/10.5802/ambp.345/ %R 10.5802/ambp.345 %G en %F AMBP_2015__22_1_1_0
Fukuda, Motohisa; Nechita, Ion. Additivity rates and PPT property for random quantum channels. Annales mathématiques Blaise Pascal, Tome 22 (2015) no. 1, pp. 1-72. doi : 10.5802/ambp.345. http://archive.numdam.org/articles/10.5802/ambp.345/
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