Publication date: 8th July 2026
Indistinguishable single photons are a fundamental resource for photonic quantum technologies, but their generation from scalable colloidal quantum emitters remains hindered by decoherence, spectral diffusion and slow radiative dynamics. Here we demonstrate near-transform-limited single-photon emission from individual lead-halide perovskite nanorods exhibiting strongly linearly polarized single-line emission and exceptionally short radiative lifetimes. The elongated nanorod geometry simultaneously enables coherent exciton delocalization in the weak confinement regime and suppresses dielectric depolarization for the longitudinal transition, concentrating the oscillator strength into a single bright dipole. Together, these effects give rise to giant oscillator strength and single-exciton superradiance, producing exceptionally short radiative lifetimes that reduce the relative impact of dephasing processes and enable optical coherence approaching the transform limit, as confirmed by Fourier correlation spectroscopy. Two-photon quantum interference measurements based on the Hong–Ou–Mandel effect reveal highly indistinguishable photon emission from individual nanorods. Statistical analysis performed over 26 individual nanorods yields average raw and corrected visibilities of ~40% and ~50%, respectively. For nanorods on which the emission spectrum, lifetime, optical coherent time, photon statistics and Hong–Ou–Mandel interference could be simultaneously monitored throughout the measurement, corrected photon indistinguishability visibilities reach up to 80%. Ultrafast streak-camera measurements identify hot-carrier cooling occurring on a few-picosecond timescale as a residual source of temporal jitter introduced by non-resonant excitation and limiting two-photon interference. Taking this contribution into account indicates that resonantly excited nanorods could approach near-unity photon indistinguishability.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.