Symmetric Extensions of Quantum States and Local Hidden Variable Theories

Barbara M. Terhal, Andrew C. Doherty, David Schwab

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)


While all bipartite pure entangled states violate some Bell inequality, the relationship between entanglement and nonlocality for mixed quantum states is not well understood. We introduce a simple and efficient algorithmic approach for the problem of constructing local hidden variable theories for quantum states. The method is based on constructing a so-called symmetric quasiextension of the quantum state that gives rise to a local hidden variable model with a certain number of settings for the observers Alice and Bob.

Original languageEnglish
Number of pages1
JournalPhysical Review Letters
Issue number15
Publication statusPublished - 2003
Externally publishedYes


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