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Rényi entropy uncertainty relation for successive projective measurements. (English) Zbl 1317.81176

Summary: We investigate the uncertainty principle for two successive projective measurements in terms of Rényi 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.

MSC:

81S05 Commutation relations and statistics as related to quantum mechanics (general)
81P15 Quantum measurement theory, state operations, state preparations
94A17 Measures of information, entropy
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