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Recently Tian, Zhang and Li (TZL) have proposed a protocol for voting basedon controlled quantum teleportation (Int. J. Theor. Phys. DOI10.1007/s10773-015-2868-8). We have critically analyzed the protocol and haveshown that it's neither efficient nor secure. Further, it is shown that in theTZL protocol, the scrutineer Charlie does not have the required control overthe voting process. Apart from showing the limitations of TZL protocol, twoimproved protocols for quantum voting along the line of TZL protocol areproposed here. One of the proposed protocols is designed using a standardscheme of controlled deterministic secure quantum communication, and the otherone is designed using the idea of quantum cryptographic switch which uses atechnique known as permutation of particles (PoP). A few possible alternativeapproaches to accomplish the same task have also been discussed. Further, theefficiencies of the proposed protocols are reported, and it is shown that theproposed protocols are free from the limitations of the TZL protocol, and theyare more efficient than the TZL protocol.

Analysis and improvement of Tian-Zhang-Li voting protocol based on controlled quantum teleportation