Almost all multipartite qubit quantum states have trivial stabilizer

Gilad Gour, Barbara Kraus, Nolan R. Wallach

Research output: Contribution to journalArticlepeer-review


The stabilizer group of an n-qubit state ψ is the set of all matrices of the form g = g1⊗..otimes;gn, with g1,..,gn being any 2×2 invertible complex matrices that satisfy gj i = j i. We showthat for 5 or more qubits, except for a set of states of zero measure, the stabilizer group of multipartite entangled states is trivial, that is, containing only the identity element. We use this result to show that for 5 or more qubits, the action of deterministic local operations and classical communication (LOCC) can almost always be simulated simply by local unitary (LU) operations. This proves that almost all n-qubit states with n≥5 can neither be reached nor be converted into any other (n-partite entangled), LU-inequivalent state via deterministic LOCC. We also find a simple and elegant expression for the maximal probability to convert one multi-qubit entangled state to another for this generic set of states.

Original languageEnglish
Article number092204
JournalJournal of Mathematical Physics
Issue number9
StatePublished - 1 Sep 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Mathematical Physics


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