Charles H. Bennett, Peter W. Shor
Science
Asymptotically entangled states which exist from which no pure entanglement can be distilled were shown. Moreover, a surprising fact that distillable entanglement was not additive by showing two undistillable asymptotically entangled states that when combined give a distillable state was shown as well. This paper presents a four-party example of a state that was asymptotically entangled but not distillable.
Charles H. Bennett, Peter W. Shor
Science
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IEEE Trans. Inf. Theory
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npj Quantum Information
David McKay, Sarah Sheldon, et al.
Physical Review Letters