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Title: Isotropic and squeezed fluctuations in an n-qubit system
Author: Munoz, C.
Klimov, Andrei B.
Issue Date: 2012
Abstract: We show that 2 n discrete coherent states of an n-qubit system, generated by application of the discrete displacement operators to a symmetric fiducial state, have isotropic fluctuations, with n/2 ? ??S 2? ? n, in a specific tangent plane, which in general is not orthogonal to the mean spin direction. This allows us to use them as reference states to define a discrete squeezing for non-symmetric n-qubit states. Examples of states with reduced fluctuations, obtained after application of XOR gates to correlate (partially entangle) qubits, are analyzed. � 2012 IOP Publishing Ltd.
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