Cross-Kerr interaction in a four-level atomic system

Gary F. Sinclair, Natalia Korolkova

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


We derive the form of the cross-Kerr interaction in a four-level atomic system in an N configuration. We use time-independent perturbation theory to calculate the eigenenergies and eigenstates of the Schrodinger equation for the system. The system is considered as a perturbation of a Raman-resonant three-level lambda scheme for which exact solutions are known. We show that within the strong control field limit the cross-Kerr interaction can arise between two weak probe fields. The strength of this nonlinear coupling is several orders of magnitude larger than that achievable using optical fibres.

Original languageEnglish
Pages (from-to)033803
Number of pages5
JournalPhysical Review. A, Atomic, molecular, and optical physics
Publication statusPublished - Sept 2007


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