HP Labs Technical Reports
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On MultiParticle Entanglement
Linden, Noah; Popescu, Sandu
HPLBRIMS9720
Keyword(s): quantum mechanics; entanglement; nonlocality; quantum computation; quantum information
Abstract: We build, using grouptheoretic methods, a general framework for approaching multiparticle entanglement. As far as entanglement is concerned, two states of n spin 1/2 particles are equivalent if they are on the same orbit of the group of local rotations (U (2)n). We give a method for finding the number of parameters needed to describe inequivalent n spin1/2 particles states. We also describe how entanglement of states on a given orbit may be characterised by the stability group of the action of the group of local rotations on any point on the orbit.
16 Pages
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