Negativity(N) is a measure for free entangled states. Everywhere N>0 the state is free entangled and for N=0 the state can be bound entangled state or separate (we can not realize here by negativity)
but the state with negativi partial transpose are regarded as destillable .
so I think both "free entanglement " and "distillable states" are same.....am I right?
Bhushan Bhoja Poojary
May be this paper will help you understand this "Distillation of free entanglement from bound-entangled states using weak measurements"
Link:
http://arxiv.org/pdf/1309.2968v2.pdf
http://arxiv.org/pdf/1309.2968v2.pdf
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