2018/12/31 by Hendrik Utzat, Weiwei Sun, Alexander E. K. Kaplan +8 · 557 citations
Engineering · Physics and Astronomy · #Coherence (philosophical gambling strategy) #Halide #Mechanical and Optical Resonators #Nanophotonics #Perovskite (structure) #Perovskite Materials and Applications #Photon #Photonics #Quantum #Quantum dot #Semiconductor #Strong Light-Matter Interactions #cond-mat.mes-hall
paper · pdf · doi:10.1126/science.aau7392
published in Science 363(6431), 1068-1072 (American Association for the Advancement of Science) · Main text - 20 pages, 4 figures. Supplementary Material - 11 pages, 8 figures
arxiv created 2018/12/31 · openalex created_date 2019/01/11 · openalex publication_date 2019/02/22 · arxiv updated 2019/03/27 · openalex updated_date 2026/08/05
Chemically made 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 picoseconds, an appreciable fraction of their 210-picosecond 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 that have fast emission, wide spectral tunability, and scalable production and that benefit from the hybrid integration with nanophotonic components that has been demonstrated for colloidal materials.