STATISTICAL ANGLE OF QUANTUM MIXED STATES | Zendy

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STATISTICAL ANGLE OF QUANTUM MIXED STATES

Author(s) -

Zhu Dongpei,

WANG REN-CHUAN,

WANG GUI-XING

Publication year - 1992

Publication title -

acta physica sinica

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.199

H-Index - 47

ISSN - 1000-3290

DOI - 10.7498/aps.41.543

Subject(s) - quantum , physics , quantum state , quantum relative entropy , divergence (linguistics) , statistical physics , trigonometric functions , quantum discord , quantum mechanics , mathematics , open quantum system , geometry , linguistics , philosophy

The statistical angle between quantum pure stages has been generalized to quantum mixed states. For the case of a single mixed state, it leads to a concept of divergence angle. A criterion for pure state is obtained. In the quantum measurement the information function is the squared cosine of statistical angle between the quantum system and the instrument. The entropy increase during the measurement process appears to be the expanding of the divergence angle.

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