Subadditivity of q-entropies for q>1

Details Subadditivity of q-entropies for q>1 Subadditivity of q-entropies for q>1

2007-05-09

arxiv.org/abs/0705.1276v1

J. Math. Phys. 48, 083507 (2007)

Physics

Mathematical Physics

2 pages

Scientific paper

10.1063/1.2771542

I prove a basic inequality for Schatten q-norms of quantum states on a finite-dimensional bipartite Hilbert space H_1\otimes H_2: 1+||\rho||_q \ge ||\trace_1\rho||_q + ||\trace_2\rho||_q. This leads to a proof--in the finite dimensional case--of Raggio's conjecture (G.A. Raggio, J. Math. Phys.\ \textbf{36}, 4785--4791 (1995)) that the q-entropies S_q(\rho)=(1-\trace[\rho^q])/(q-1) are subadditive for q > 1; that is, for any state \rho, S_q(\rho) is not greater than the sum of the S_q of its reductions, S_q(\rho) \le S_q(\trace_1\rho)+S_q(\trace_2\rho).

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