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SUMMARY:How to find half the local unitary invariants of pure qubit states
  - Graeme Mitchison
DTSTART:20100218T141500Z
DTEND:20100218T151500Z
UID:TALK23182@talks.cam.ac.uk
CONTACT:Jonathan
DESCRIPTION:A complete\, independent set of local unitary invariants for a
 n n-party system would enable one to characterise all the types of entangl
 ement that could occur in that system. Unfortunately\, it is hard to come 
 up with such a set\, even for pure qubit states\, and this has only been d
 one for n <=4. The number of invariants grows exponentially with n\, so th
 e enterprise looks a bit daunting. I will describe a set of 2^n invariants
  that accounts for about half of them. Furthermore\, the set of invariants
  has a simple hierarchical structure. There is also a hint as to how one m
 ight go looking for the other half.
LOCATION:MR15\, Centre for Mathematical Sciences
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