Energy-Degenerate Photon-Pair Generation from Individual CsPbBr₃ Quantum Dots.

ABSTRACT: Beyond single-photon emission, generating correlated N-photon bundles, e.g., a photon pair, is essential for various quantum technologies including quantum teleportation and metrology. A widely explored approach exploits the radiative biexciton cascade in individual (mainly epitaxially grown) quantum dots (QDs). Here, we investigate such a cascade in colloidal CsPbBr₃ QDs, a scalable and solution-processable quantum-light emitter. By matching their size-dependent biexciton binding energies to their size-independent phonon energies, we demonstrate the generation of time-correlated and energy-degenerate photon pairs in large (>15 nm) QDs. Under pulsed excitation at 4 K, we observe pronounced photon bunching, with a g⁽²⁾(0) of up to 7 in Hanbury Brown and Twiss me

SUBMITTER: Zhu C 

PROVIDER: S-EPMC12426991 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature