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

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“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)

H. A. M. Leymann, A. Foerster, and J. Wiersig

Phys. Rev. B 89 (2014) 085308.

File attached: leymann2014.pdf (757.49 KB)

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.