Re: Re: von Neumann entropy
- To: mathgroup at smc.vnet.net
- Subject: [mg43158] Re: [mg43153] Re: von Neumann entropy
- From: Eric Bittner <bittner at uh.edu>
- Date: Fri, 15 Aug 2003 04:27:05 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hi Paul, You're procedure > r = Eigenvalues[rho]; > S = - r . Log[r] is the correct way to compute S = -Tr(rho log(rho) ). The basic idea being that the trace is invariant to representation. At least, this is the way we compute S in our quantum relaxation work. Cheers! Eric -- Prof. Eric R. Bittner Department of Chemistry Univ. of Houston ph: 713-743-2775 fax: 713-743-2709 bittner at uh.edu http://k2.chem.uh.edu/bittner/ ------------------------------------------------------------------------ ------------------- The sun, with all those planets revolving around it and dependent upon it, can still ripen a bunch of grapes as if it had nothing else in the universe to do. -Galileo Galilei, physicist and astronomer (1564-1642)