Phys. Rev. A 67, 062108 (2003) [3 pages]Estimation of purity in terms of correlation functionsReceived 8 January 2003; published 26 June 2003 We prove a rigorous inequality that estimates the purity of a reduced density matrix of a composite quantum system in terms of cross correlation of the same state and an arbitrary product state. Various immediate applications of our result are proposed, in particular, concerning Gaussian wave-packet propagation under classically regular dynamics. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.67.062108
DOI:
10.1103/PhysRevA.67.062108
PACS:
03.65.Yz, 42.50.Ct, 32.80.Qk
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