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In November 2025, Quantinuum released its Helios QPU with 98 qubits. It also announced it was sold to Singapore as part of a partnership with A*Star and to be deployed there in 2026. Helios got less attention than the recent news coming from Google (Willow, Echoes) and Microsoft (Majorana 1) but it deserves it. It is one of the best QPUs ever produced so far in the NISQ regime. I will look here at its key disclosed technical characteristics. It’s a first for me given I’ve mostly always published such posts only on superconducting and Majorana qubits.
Helios is fairly well described technically in Helios: A 98-qubit trapped-ion quantum computer by Anthony Ransford, M.S. Allman et al, arXiv, November 2025 (25 pages). Most of the information below comes from this preprint paper.
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Nous voici dans le 74ième épisode de Quantum, le podcast mensuel francophone de l’actualité quantique.
Et tant de news, anecdotes et analyse à partager en compagnie de Fanny Bouton. Au menu, nous avons toujours plein d’événements, et surtout la saison des prix Nobel de physique et les dernières annonces de Google. Sans compter diverses actualités des startups françaises que nous suivons de très près.
Et toujours au menu, le transcript et les liens utiles du podcast.
Evénements passés
Q2B 2025 Paris : toutes les vidéos de la Q2B Paris de septembre 2025 sont disponibles. Avec notamment la forte présence de Quandela avec les interventions de Pascale Senellart, Shane Mansfield, Xavier Pereira et Thomas Volz. Et aussi Loic Le Loarer sur la stratégie nationale quantique. Au passage, mes propres interventions : The energetic challenges of FTQC et An End-User View of Hardware Roadmaps.
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I published the 2025 edition of the ebook “Understanding Quantum Technologies” on September 29th, 2025. Since then, I regularly updated it with news, mostly related to new arXiv preprints. The update log is at the end of the book.
Like with each past editions since 2021, I wait about a month of beautifying and then publish the book on arXiv. The goal is to extend its “distribution” to a broader scientific audience.
It is now available on https://arxiv.org/abs/2111.15352, with the full version in Letter format, now containing 1,522 pages.
I will still continue to update the book on this website and provide it in multiple formats: A4 and Letter, full version, of full version split in 5 parts, and a key takeaways version of 36 pages in both A4 and Letter formats. I always recommend readers to download the last edition of this book.
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