On the impossibility of non-static quantum bit commitment between two parties

Authors:
Qin Li;Chengqing Li;Dongyang Long;W. H. Chan;Chunhui Wu
Affiliations:
College of Information Engineering, Xiangtan University, Xiangtan, China 411105;College of Information Engineering, Xiangtan University, Xiangtan, China 411105;Department of Computer Science, Sun Yat-sen University, Guangzhou, China 510006;Department of Mathematics and Information Technology, The Hong Kong Institute of Education, Hong Kong, China;Department of Computer Science, Guangdong University of Finance, Guangzhou, China 510521
Venue:
Quantum Information Processing
Year:
2012

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Abstract

Recently, Choi et al. proposed an assumption on Mayers---Lo---Chau (MLC) no-go theorem that the state of the entire quantum system is invariable to both participants before the unveiling phase. This makes us suspect that the theorem is only applicable to static quantum bit commitment (QBC). This paper clarifies that the MLC no-go theorem can be applied to not only static QBC, but also non-static one. A non-static QBC protocol proposed by Choi et al. is briefly reviewed and analyzed to work as a supporting example. In addition, a novel way to prove the impossibility of the two kinds of QBC is given.