Rank two bipartite bound entangled states do not exist

Pawel Horodecki*, John A. Smolin, Barbara M. Terhal, Ashish V. Thapliyal

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

51 Citations (Scopus)


We explore the relation between the rank of a bipartite density matrix and the existence of bound entanglement. We show a relation between the rank, marginal ranks, and distillability of a mixed state and use this to prove that any rank n bound entangled state must have support on no more than an n × n Hilbert space. A direct consequence of this result is that there are no bipartite bound entangled states of rank two. We also show that a separability condition in terms of a quantum entropy inequality is associated with the above results. We explore the idea of how many pure states are needed in a mixture to cancel the distillable entanglement of a Schmidt rank n pure state and provide a lower bound of n - 1. We also prove that a mixture of a non-zero amount of any pure entangled state with a pure product state is distillable.
Original languageEnglish
Pages (from-to)589-596
Number of pages8
JournalTheoretical Computer Science
Issue number3
Publication statusPublished - 2003
Externally publishedYes
EventAlgorithms in Quantum Information Processing - Chicago, IL, United States
Duration: 18 Jan 199922 Jan 1999


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