Probing coherent Cooper pair splitting with cavity photons

5 pages, 4 figuresInternational audienceThis work discusses theoretically the behavior of a microwave cavity and a Cooper pair beam splitter (CPS) coupled non-resonantly. The cavity frequency pull is modified when the CPS is resonant with a microwave excitation. This provides a direct way to probe the coherence of the Cooper pair splitting process. More precisely, the cavity frequency pull displays an anticrossing whose specificities can be attributed unambigously to coherent Cooper pair injection. This work illustrates that microwave cavities represent a powerfull and qualitatively new tool to investigate current transport in complex nanocircuits