Nonlinear quantum logic with colliding graphene plasmons

Giuseppe Calajó (Corresponding author), Philipp K. Jenke, Lee A. Rozema, Philip Walther, Darrick E. Chang, Joel D. Cox (Corresponding author)

Publications: Contribution to journalArticlePeer Reviewed


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 a flat band dispersion that enhances their interaction. This scenario presents interesting possibilities towards the implementation of multimode 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 π phase shift (CZ), where the gate performance is fundamentally limited only by the single-plasmon lifetime. These results open exciting avenues towards quantum information and many-body applications with strongly interacting polaritons.
Original languageEnglish
Article number013188
Number of pages12
JournalPhysical Review Research
Issue number1
Early online date17 Mar 2023
Publication statusPublished - Mar 2023

Austrian Fields of Science 2012

  • 103026 Quantum optics
  • 103021 Optics


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