期刊
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
卷 40, 期 28, 页码 8127-8136出版社
IOP PUBLISHING LTD
DOI: 10.1088/1751-8113/40/28/S18
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We derive an inequality relating the entropy difference between two quantum states to their trace norm distance, sharpening a well-known inequality due to Fannes. In our inequality, equality can be attained for every prescribed value of the trace norm distance.
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