Yang, Yu-Guang; Jia, Xin; Xu, Peng; Tian, Ju Analysis and improvement of the watermark strategy for quantum images based on quantum Fourier transform. (English) Zbl 1283.81041 Quantum Inf. Process. 12, No. 8, 2765-2769 (2013). Summary: We investigate the quantum watermark strategy for quantum images based on quantum Fourier transform proposed by W.-W. Zhang et al. [ibid. 2, No. 2, 793–803 (2013; Zbl 1264.81131)]. It is aimed to embed the watermark image into the Fourier coefficients of the quantum carrier image without affecting the carrier image’s visual effect. However, in our opinion the protocol is not clearly described and several steps are ambiguous. Moreover, we argue that the watermarking algorithm claimed by the authors is incorrect. At last, a possible improvement strategy is presented. Cited in 30 Documents MSC: 81P68 Quantum computation 68U10 Computing methodologies for image processing 65T50 Numerical methods for discrete and fast Fourier transforms Keywords:quantum information; quantum computation; quantum watermarking; quantum Fourier transform Citations:Zbl 1264.81131 PDF BibTeX XML Cite \textit{Y.-G. Yang} et al., Quantum Inf. Process. 12, No. 8, 2765--2769 (2013; Zbl 1283.81041) Full Text: DOI OpenURL References: [1] Zhang, W-W; Gao, F; Liu, B; Wen, Q-Y; Chen, H, A watermark strategy for quantum images based on quantum Fourier transform, Quantum Inf. Process., 12, 793-803, (2013) · Zbl 1264.81131 [2] Zhang, W-W; Gao, F; Liu, B; Jia, HY; Wen, Q-Y; Chen, H, A quantum watermark protocol, Int. J. Theor. Phys., 52, 504-513, (2013) · Zbl 1264.81127 This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. It attempts to reflect the references listed in the original paper as accurately as possible without claiming the completeness or perfect precision of the matching.