Expectation value based equation-of-motion approach for open quantum systems


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3 months ago by
“Expectation value based equation-of-motion approach for open quantum systems: A general formalism”
H. A. M. Leymann, A. Foerster, and J. Wiersig
Phys. Rev. B 89 (2014) 085308.

File attached: leymann2014.pdf (757.49 KB)

They intend to use expectation values instead of correlation functions. But aren't the two closely related, so that one can find expectation values via correlation functions?
The other point is that it might be tremendously hard to do perturbative techniques directly on the expectation values, rather than the correlation functions (like infinite resummations).
Finally, often, several expectation values can be obtained via a single correlation function. So, correlation functions seem to be more fundamental and versatile.
written 3 months ago by AlQuemist  

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