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Vacuum polarization in QED in a background gravitational field inducesinteractions which {\it effectively} modify the classical picture of light raysas the null geodesics of spacetime. After a short introduction on the mainaspects of the quantum gravitational optics, as a nontrivial example, we studythis effect in the background of NUT space characterizing the spacetime of aspherical mass endowed with a gravitomagnetic monopole charge, the so calledNUT factor.Comment: 9 pages, title changed and the text abridged for publication in the  Journal of Physics: Conference serie

Quantum gravitational optics in the field of a gravitomagnetic monopole