Generalized Quantum Secret Sharing

Details Generalized Quantum Secret Sharing Generalized Quantum Secret Sharing

2003-07-28

arxiv.org/abs/quant-ph/0307200v5

Phys. Rev. A 71, 012328 (2005)

Physics

Quantum Physics

To appear in Phys. Rev. A., 7 pages

Scientific paper

10.1103/PhysRevA.71.012328

We explore a generalization of quantum secret sharing (QSS) in which classical shares play a complementary role to quantum shares, exploring further consequences of an idea first studied by Nascimento, Mueller-Quade and Imai (Phys. Rev. {\bf A64} 042311 (2001)). We examine three ways, termed inflation, compression and twin-thresholding, by which the proportion of classical shares can be augmented. This has the important application that it reduces quantum (information processing) players by replacing them with their classical counterparts, thereby making quantum secret sharing considerably easier and less expensive to implement in a practical setting. In compression, a QSS scheme is turned into an equivalent scheme with fewer quantum players, compensated for by suitable classical shares. In inflation, a QSS scheme is enlarged by adding only classical shares and players. In a twin-threshold scheme, we invoke two separate thresholds for classical and quantum shares based on the idea of information dilution.

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