Direct observation of a few-photon phase shift induced by a single quantum emitter in a waveguide.

ABSTRACT: Realizing a sensitive photon-number-dependent phase shift on a light beam is required both in classical and quantum photonics. It may lead to new applications for classical and quantum photonics machine learning or pave the way for realizing photon-photon gate operations. Nonlinear phase-shifts require efficient light-matter interaction, and recently quantum dots coupled to nanophotonic devices have enabled near-deterministic single-photon coupling. We experimentally realize an optical phase shift of 0.19π ± 0.03 radians ( ≈ 34 degrees) using a weak coherent state interacting with a single quantum dot in a planar nanophotonic waveguide. The phase shift is probed by interferometric measurements of the light scattered from the quantum dot in the waveguide. The process is nonlinear in power,

SUBMITTER: Staunstrup MJR 

PROVIDER: S-EPMC11365957 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature