Storage by trapping and spatial staggering of multiple interacting solitons in $Λ$-type media

In this paper we investigate the properties of self induced transparency (SIT) solitons, propagating in a $Λ$-type medium. It was found that the interaction between SIT solitons can lead to trapping with their phase preserved in the ground state coherence of the medium. These phases can be altered in a systematic way by the application of appropriate light fields, such as additional SIT solitons. Furthermore, multiple independent SIT solitons can be made to propagate as bi-solitons through their mutual interaction with a separate light field. Finally, we demonstrate that control of the SIT soliton phase can be used to implement an optical exclusive-or gate.

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