Lance, AndrewSymul, ThomasBowen, Warwick PTyc, TomasSanders, Barry CyrilLam, Ping Koy2009-05-052010-12-202009-05-052010-12-20New Journal of Physics 5 (2003): 4.1-4.131367-2630http://hdl.handle.net/10440/211http://digitalcollections.anu.edu.au/handle/10440/211We present two schemes to perform continuous variable (2, 3) threshold quantum secret sharing (QSS) on the quadrature amplitudes of bright light beams. Both schemes require a pair of entangled light beams. The first scheme utilizes two phase sensitive optical amplifiers, whilst the second uses an electro-optic feedforward loop for the reconstruction of the secret. We examine the efficacy of QSS in terms of fidelity, as well as the signal transfer coefficients and the conditional variances of the reconstructed output state. We show that both schemes in the ideal case yield perfect secret reconstruction.13 pageshttp://www.iop.org/EJ/journal/-page=extra.copyright/NJP "NJP’s copyright statement allows authors and their institutions to reproduce, distribute and communicate the published version of their article to the public. Under this agreement NJP authors may: post the published version of their article on their own personal website, on their employer’s website/repository and on free public servers in their subject area." and "Third parties have the same rights to reuse articles in NJP as described in the Creative Commons Attribution-Non-Commercial-ShareAlike 2.5 license. These open access rights allow third-party users to copy, distribute and display the published version of articles in NJP, and create derivative works, subject to appropriate attribution and non-commercial exploitation." - from journal web site (as at 19/02/10)2003-01-172015-12-12