Local unitary equivalence of multipartite pure states.

  title={Local unitary equivalence of multipartite pure states.},
  author={Barbara Kraus},
  journal={Physical review letters},
  volume={104 2},
  • B. Kraus
  • Published 28 September 2009
  • Physics, Mathematics
  • Physical review letters
Necessary and sufficient conditions for the equivalence of arbitrary n-qubit pure quantum states under local unitary (LU) operations are derived. First, an easily computable standard form for multipartite states is introduced. Two generic states are shown to be LU equivalent iff their standard forms coincide. The LU-equivalence problem for nongeneric states is solved by presenting a systematic method to determine the LU operators (if they exist) which interconvert the two states. 
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I and i
There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
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