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Quantum plasmonics experiments have on multiple occasions reported theobservation of quantum coherence of discrete plasmons, which exhibit remarkablepreservation of quantum interference visibility, a seemingly surprising featurefor systems mixing light and matter with high ohmic losses during propagation.However, most experiments to date used essentially weakly-confined plasmons,which experience limited light-matter hybridization, thus limiting thepotential for decoherence. Here, we report quantum coherence of plasmons nearthe surface plasmon polariton (SPP) resonance frequency, where plasmonicdispersion and confinement is much stronger than in previous experiments. Wegenerated polarization-entangled pairs of photons using spontaneous parametricdown conversion and transmitted one of the photons through a plasmonic holearray designed to convert incident single photons into highly-dispersive singleSPPs. We find the quality of photon entanglement after the plasmonic channel tobe unperturbed by the introduction of a highly dispersive plasmonic element.Our findings provide a lower bound of 100 femtoseconds for the pure dephasingtime for dispersive plasmons in gold, and show that even in a highly dispersiveregime surface plasmons preserve quantum mechanical correlations, makingpossible harnessing the power of extreme light confinement for integratedquantum photonics.

Quantum Coherence is Preserved in Extremely Dispersive Plasmonic Media