Dynamical decoupling of a quantum dot spin in a micropillar cavity for spin-multiphoton entanglement

Quantum Physics arXiv:2606.28535 (quant-ph) [Submitted on 26 Jun 2026] Title:Dynamical decoupling of a quantum dot spin in a micropillar cavity for spin-multiphoton entanglement Authors:H. Huet, P. R. Ramesh, R. Frantzeskakis, L. Couronné, P. Steindl, V. Guichard, M. Morassi, A. Lemaître, I. Sagnes, M.F. Doty, L. Lanco, D. A. Fioretto, S. C. Wein, P. Senellart, O. Krebs View a PDF of the paper titled Dynamical decoupling of a quantum dot spin in a micropillar cavity for spin-multiphoton entanglement, by H. Huet and 14 other authors View PDF HTML (experimental) Abstract:Graph states of mutually entangled photons are key resources for quantum computation and communication and can be generated by leveraging the entanglement between a single resident spin and emitted photons from a charged semiconductor quantum dot (QD). This approach is intrinsically limited by the decoherence of the spin. We study how to mitigate this decoherence with dynamical decoupling of an electron spin in the weak transverse magnetic field regime using spin echo and Carr-Purcell-Meiboom-Gill (CPMG) techniques. Application of these techniques allows us to extend the coherence time of a spin by more than two orders of magnitude, extracting a $T_2^{CPMG}$ of $298\pm53$ ns. We further demonstrate that this technique is compatible with the generation of a spin-photon-photon entangled state at a high rate enabled by a micropillar cavity, with a 20% improvement in simulated state fidelity when using dynamical decoupling. These results pave the way for generating larger and more complex entangled states with QDs. Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2606.28535 [quant-ph] (or arXiv:2606.28535v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2606.28535 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Prashant Ramesh [view email] [v1] Fri, 26 Jun 2026 18:38:02 UTC (1,496 KB) Full-text links: Access Paper: View a PDF of the paper titled Dynamical decoupling of a quantum dot spin in a micropillar cavity for spin-multiphoton entanglement, by H. Huet and 14 other authorsView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-06 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv (What is alphaXiv?) Links to Code Toggle CatalyzeX Code Finder for Papers (What is CatalyzeX?) DagsHub Toggle DagsHub (What is DagsHub?) GotitPub Toggle Gotit.pub (What is GotitPub?) Huggingface Toggle Hugging Face (What is Huggingface?) ScienceCast Toggle ScienceCast (What is ScienceCast?) Demos Demos Replicate Toggle Replicate (What is Replicate?) Spaces Toggle Hugging Face Spaces (What is Spaces?) Spaces Toggle TXYZ.AI (What is TXYZ.AI?) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower (What are Influence Flowers?) Core recommender toggle CORE Recommender (What is CORE?) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs. Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)