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We investigate the excitation of quantum plasmonic states of light ingraphene using end-fire and prism coupling. In order to model the excitationprocess quantum mechanically we quantize the transverse-electric andtransverse-magnetic surface plasmon polariton (SPP) modes in graphene. Aselection of regimes are then studied that enable the excitation of SPPs byphotons and we show that efficient coupling of photons to graphene SPPs ispossible at the quantum level. Futhermore, we study the excitation of quantumstates and their propagation under the effects of loss induced from theelectronic degrees of freedom in the graphene. Here, we investigate whether itis possible to protect quantum information using quantum error correctiontechniques. We find that these techniques provide a robust-to-loss method fortransferring quantum states of light in graphene over large distances.

Quantum plasmonic excitation in graphene and robust-to-loss propagation