Can, M. A.Klyachko, A.Shumovsky, A.2016-02-082016-02-082005-1464http://hdl.handle.net/11693/24116Using the approach to quantum entanglement based on the quantum fluctuations of observables, we show the existence of perfect entangled states of a single 'spin-1' particle. We give physical examples related to photons and condensed matter physics. © 2005 IOP Publishing Ltd.EnglishBiphotonEntanglementQutritSpin - 1Article10.1088/1464-4266/7/2/L011741-3575