Nonlinear quantum logic with colliding graphene plasmons

Abstract

Graphene has emerged as a promising platform to bring nonlinear quantum optics to the nanoscale, where a large intrinsic optical nonlinearity enables long-lived and actively tunable plasmon polaritons to strongly interact. Here we theoretically study the collision between two counter-propagating plasmons in a graphene nanoribbon, where transversal subwavelength confinement endows propagating plasmons with %large effective masses a flat band dispersion that enhances their interaction. This scenario presents interesting possibilities towards the implementation of multi-mode polaritonic gates that circumvent limitations imposed by the Shapiro no-go theorem for photonic gates in nonlinear optical fibers. As a paradigmatic example we demonstrate the feasibility of a high fidelity conditional Pi phase shift (CZ), where the gate performance is fundamentally limited only by the single-plasmon lifetime. These results open new exciting avenues towards quantum information and many-body applications with strongly-interacting polaritons.

13 pages, 5 figures

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• Dyadic Green's Functions and Guided Surface Waves for a Surface Conductivity Model of Graphene
• Direct observation of Anderson localization of matter-waves in a controlled disorder
• Highly confined low-loss plasmons in graphene-boron nitride heterostructures
• Anderson Localization of Expanding Bose-Einstein Condensates in Random Potentials
• Long-range interactions and entanglement of slow single-photon pulses
• Extraordinary nonlinear plasmonics in graphene nanoislands
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Cited by in corpus (7)

• Roadmap for Photonics with 2D Materials
• Roadmap on Nonlocality in Photonic Materials and Metamaterials
• On-chip transfer of ultrashort graphene plasmon wavepackets using terahertz electronics
• Generation of entangled waveguided photon pairs by free electrons
• Light-Matter Interaction in the ZXW Calculus
• Nonreciprocal plasmons in one-dimensional carbon nanostructures
• Screened topological plasmons in graphene plasmonic crystals