Stronger subadditivity of entropy

@article{Lieb2005StrongerSO,
  title={Stronger subadditivity of entropy},
  author={E. Lieb and R. Seiringer},
  journal={Physical Review A},
  year={2005},
  volume={71},
  pages={062329}
}
The strong subadditivity of entropy plays a key role in several areas of physics and mathematics. It states that the entropy S[{rho}]=-Tr({rho} ln {rho}) of a density matrix {rho}{sub 123} on the product of three Hilbert spaces satisfies S[{rho}{sub 123}]-S[{rho}{sub 12}]{<=}S[{rho}{sub 23}]-S[{rho}{sub 2}]. We strengthen this to S[{rho}{sub 123}]-S[{rho}{sub 12}]{<=}{sigma}{sub {alpha}}n{sup {alpha}}(S[{rho}{sub 23}{sup {alpha}}]-S= [{rho}{sub 2}{sup {alpha}}]), where the n{sup {alpha}} are… Expand
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