Nonlinear quantum logic with colliding graphene plasmons

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

Organisation(s)
Quantum Optics, Quantum Nanophysics and Quantum Information
External organisation(s)
Barcelona Institute of Science & Technology, Istituto Nazionale di Fisica Nucleare (INFN), Roma, Institució Catalana de Recerca i Estudis Avançats (ICREA), University of Southern Denmark (SDU)
Journal
Physical Review Research
Volume
5
No. of pages
12
ISSN
2643-1564
DOI
https://doi.org/10.1103/PhysRevResearch.5.013188
Publication date
03-2023
Peer reviewed
Yes
Austrian Fields of Science 2012
103026 Quantum optics, 103021 Optics
ASJC Scopus subject areas
Physics and Astronomy(all)
Portal url
https://ucrisportal.univie.ac.at/en/publications/nonlinear-quantum-logic-with-colliding-graphene-plasmons(05c5f197-ee91-419a-ab51-30deac170f32).html