Chemically prepared colloidal semiconductor quantum dots have long been proposed as scalable and color-tunable single emitters in quantum optics, but they have typically suffered from prohibitively incoherent emission. We now demonstrate that individual colloidal lead halide perovskite quantum dots (PQDs) display highly efficient single photon emission with optical coherence times as long as 80 ps, an appreciable fraction of their 210 ps radiative lifetimes. These measurements suggest that PQDs should be explored as building blocks in sources of indistinguishable single photons and entangled photon pairs. Our results present a starting point for the rational design of lead halide perovskite-based quantum emitters with fast emission, wide spectral-tunability, scalable production, and which benefit from the hybrid-integration with nano-photonic components that has been demonstrated for colloidal materials.
@article{arxiv.1812.11923,
title = {Coherent Single Photon Emission from Colloidal Lead Halide Perovskite Quantum Dots},
author = {Hendrik Utzat and Weiwei Sun and Alexander E. K. Kaplan and Franziska Krieg and Matthias Ginterseder and Boris Spokoyny and Nathan D. Klein and Katherine E. Shulenberger and Collin F. Perkinson and Maksym V. Kovalenko and Moungi G. Bawendi},
journal= {arXiv preprint arXiv:1812.11923},
year = {2019}
}
Comments
Main text - 20 pages, 4 figures. Supplementary Material - 11 pages, 8 figures