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论文类型：期刊论文

发表时间：2015-06-01

发表刊物：QUANTUM INFORMATION PROCESSING

收录刊物：SCIE、EI

卷号：14

期号：6

页面范围：2239-2253

ISSN号：1570-0755

关键字：Renyi entropy; Uncertainty relation; Successive projective measurements

摘要：We investigate the uncertainty principle for two successive projective measurements in terms of R,nyi entropy based on a single quantum system. Our results cover a large family of the entropy (including the Shannon entropy) uncertainty relations with a lower optimal bound. We compare our relation with other formulations of the uncertainty principle in two-spin observables measured on a pure quantum state of qubit. It is shown that the low bound of our uncertainty relation has better tightness.