Hi,(adsbygoogle = window.adsbygoogle || []).push({});

I am trying to work out the atomic inversion of the Jaynes cummings model using the density matrix. At the moment i have a 2x2 matrix having used the Von neumann equation (technically in Wigner function in x and y).

Each of my matrix elements are 1st order pde's describing the evolution of the system...I want to know how do I perform a partial trace on this density matrix.

I've seen it mentioned that to work out the atomic inversion of the atom I need to do a partial trace over oscillator variables...but I don't understand how to do this mathematically...using my 4 pde's in x and y?

Any help would be great. Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Partial trace of the density matrix

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**