Physics – Quantum Physics
Scientific paper
2011-09-05
Physics
Quantum Physics
9 pages 4 figures
Scientific paper
The quantum of emission and absorption in all the elements of the chain of a multiphoton process is the same, meaning a photon, and this should imply that the total number of photons emitted or absorbed in the different applied fields in a XPM system, due to a single multiphoton process, should be the same. This is the point of view with which we analyze our calculations of susceptibities in two different EIT systems showing XPM nonlinearities. We show that all multiphoton processes, seen in our work, belong to one of three types: 1. the multiphoton process is visible in two or more fields simultaneously. 2. the multiphoton process is visible only in one field because of equal number of absorption and stimulated emissions of photons in other fields. 3. the multiphoton process is visible only in one field due to the presence of a reverse process that renders it invisible in other fields.We propose an experiment to test our claim about the existence of the multiphoton processes of type1. We also show the possibility of light squeezing at low light levels,due to an EIT enhanced XPM nonlinearity higher than $\chi^{(3)}$, in one of the fields in one of the systems that can be mapped on to the levels involved in the D2 line in Rb. The coexisting nonlinearities can be made small. This promising source of light squeezing is novel, to the best of our knowledge.
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