Efficient two-photon emission from a quantum dot
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Subjects Quantum opticsSingle photons and quantum effects Reliable control over photon number is essential for scalable quantum photonics, yet producing well-defined two-photon emission from quantum emitters remains challenging. Now, by exploiting a dark-state pathway to biexciton population in a quantum-dot microcavity, bright high-purity photon pairs have been generated, offering a promising route towards practical two-photon sources. Access through your institution Buy or subscribe This is a preview of subscription content, access via your institution Access options Access through your institution Access Nature and 54 other Nature Portfolio journals Get Nature+, our best-value online-access subscription $32.99 / 30 days cancel any time Learn more Subscribe to this journal Receive 12 print issues and online access $259.00 per year only $21.58 per issue Learn more Buy this articlePurchase on SpringerLinkInstant access to the full article PDF.USD 39.95Prices may be subject to local taxes which are calculated during checkout Fig. 1: A cavity-enhanced two-photon emitter. ReferencesSlusher, R. E., Hollberg, L. W., Yurke, B., Mertz, J. C. & Valley, J. F. Observation of squeezed states generated by four-wave mixing in an optical cavity. Phys. Rev. Lett. 55, 2409–2412 (1985). This paper records the experimental demonstration of squeezed states, paving the way for the generation of non-classical light, including photon-number states, through nonlinear optical processes.Article CAS PubMed Google Scholar Ding, X. et al. High-efficiency single-photon source above the loss-tolerant threshold for efficient linear optical quantum computing. Nat. Photon. 19, 387–391 (2025). This paper shows the maturity of single-photon quantum-dot sources, in the advance towards optical quantum computing.Article CAS Google Scholar Liu, S. et al. Quantum correlations of spontaneous two‑photon emission from a quantum dot. Nature 643, 1234–1239 (2025). This paper reports a breakthrough in cavity‑assisted spontaneous two‑photon emission, highlighting the role of Purcell enhancement.Article CAS PubMed Google Scholar Heindel, T. et al. A bright triggered twin‑photon source in the solid state. Nat. Commun. 8, 14870 (2017). This paper presents a demonstration of near‑degenerate biexciton emission from a quantum dot but with limited brightness and bunching.Article CAS PubMed PubMed Central Google Scholar Ding, F. et al. Tuning the exciton binding energies in single self-assembled InGaAs/GaAs quantum dots by piezoelectric-induced biaxial stress. Phys. Rev. Lett. 104, 067405 (2010). This paper reports the use of external biaxial stress to tune the biexciton binding energy in quantum dots.Article CAS PubMed Google Scholar Download referencesAdditional informationPublisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.This is a summary of: Wu, B. et al. Purcell-enhanced two-photon emission from a quantum dot via dark-state biexciton loading. Nat. Mater. https://doi.org/10.1038/s41563-026-02522-9 (2026).Rights and permissionsReprints and permissionsAbout this articleCite this article Efficient two-photon emission from a quantum dot. Nat. Mater. (2026). https://doi.org/10.1038/s41563-026-02523-8Download citationPublished: 02 March 2026Version of record: 02 March 2026DOI: https://doi.org/10.1038/s41563-026-02523-8Share this articleAnyone you share the following link with will be able to read this content:Get shareable linkSorry, a shareable link is not currently available for this article.Copy shareable link to clipboard Provided by the Springer Nature SharedIt content-sharing initiative Purcell-enhanced two-photon emission from a quantum dot via dark-state biexciton loading Bang WuLi LiuZhiliang Yuan Nature Materials Article 02 Mar 2026