Continuous variable (2, 3) threshold quantum secret sharing schemes

We present two schemes to perform continuous variable (2, 3) quantum secret sharing (QSS) on the quadrature amplitudes of bright beams. Both schemes require a pair of entangled light beams. The first utilizes two phase sensitive optical amplifiers, whilst the second uses an -optic feedforward loop for the reconstruction of the secret. We examine efficacy of QSS in terms of fidelity, as well as the signal transfer coefficients the conditional variances of the reconstructed output state. We show that schemes in the ideal case yield perfect secret reconstruction.