Non Zero Moments of Some Entangled Three Qubit Symmetric States

Abstract

We study three qubit symmetric states by employing a new representation for the corresponding density matrix. Symmetric N-qubit state is equivalent to well known angular momentum state, | jm where { j = N/2, m = + j to− j } which is also known as Dicke state. The fifteen parameters which characterize the density matrix are real and provide physical interpretation as they are related to first, second and third order moments of spin operators J x , J y , J z . Non-zero parameters for some well known entangled states are obtained.