Single qubit quantum secret sharing with improved security

Authors:
Guang Ping He;Z. D. Wang
Affiliations:
School of Physics & Engineering and Advanced Research Center, Sun Yat-sen University, Guangzhou, China and Center of Theoretical and Computational Physics, The University of Hong Kong, Pokfula ...;Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China
Venue:
Quantum Information & Computation
Year:
2010

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Abstract

Analyzing carefully an experimentally feasible non-entangled single qubit quantum secretsharing protocol and its modified version [Phys. Rev. Lett. 95, 230505 (2005); ibid.98, 028902 (2007)], it is found that both versions are insecure against coherent attacksthough the original idea is so remarkable. To overcome this fatal flaw, here we proposea protocol with a distinct security checking strategy, which still involves single qubitoperations only, making it possible to achieve better security of quantum secret sharingwith current technology.