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Ultrathin optical fibres integrated into cold atom setups are proving to beideal building blocks for atom-photon hybrid quantum networks. Such opticalnanofibres (ONF) can be used for the demonstration of nonlinear optics andquantum interference phenomena in atomic media. Here, we report on theobservation of multilevel cascaded electromagnetically induced transparency(EIT) using an optical nanofibre to interface cold $^{87}$Rb atoms through theintense evanescent fields that can be achieved at ultralow probe and couplingpowers. Both the probe (at 780 nm) and the coupling (at 776 nm) beams propagatethrough the nanofibre. The observed multipeak transparency spectra of the probebeam could offer a method for simultaneously slowing down multiple wavelengthsin an optical nanofibre or for generating ONF-guided entangled beams, showingthe potential of such an atom-nanofibre system for quantum information. We alsodemonstrate all-optical-switching in the all fibred system using the obtainedEIT effect.

Multi-level cascaded electromagnetically induced transparency in cold atoms using an optical nanofibre interface