--------------------------------------------------------------------------------- Daniel Manzano Quantum Thermodynamics and Computation Group University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 https://ic1.ugr.es/members/dmanzano/

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From: INSUA PIÑEIRO ALBERTO <alberto.insua.pineiro@usc.es> Subject: [Quantum_spain_TalentQ] New TalentQ Seminar | December 2nd @4pm Date: 26. November 2025 at 10:16:18 CET To: "quantum_spain_talentq@bsc.es" <quantum_spain_talentq@bsc.es>

Speaker: Josu Etxezarreta

Title: Advances in low-overhead quantum error correction

Abstract: The extremely fragile nature of quantum information implies that quantum error correction (QEC) techniques are going to be necessary to obtain the full benefits that quantum computing offers theoretically. While QEC has been experimentally proven to be effective, it requires significant overheads that should be alleviated. In this talk, I will discuss our recent advances towards low-overhead quantum error correction. First, I will discuss how to leverage biased noise in technologies that do not allow for a bias-preserving CNOT gate (arXiv:2505.17718). Our numerical results imply that up to a 75% qubit reduction can be achieved using the XZZX surface code. Second, quantum low-density parity-check (qLDPC) codes have been recently proposed as viable ways to reduce qubit footprints significantly, but they lack an efficient decoding algorithm. I will introduce our proposal, named Belief Propagation Ordered Tanner Forest (BP+OTF) decoding (arXiv:2409.01440). Numerical simulations show that the BP+OTF decoder achieves similar logical error suppression compared to state-of-the-art inversion-based and matching decoders for bivariate bicycle and surface codes, respectively, while maintaining almost-linear runtime complexity across all stages.

Registration: https://events.teams.microsoft.com/event/f7650729-b33d-4aca-9cd3-22f560ff388...

Alberto Insua Piñeiro Content Creator - TalentQ Galician Institute of High Energy Physics (IGFAE) Tel. +34 698 15 44 56 _______________________________________________ Quantum_Spain_TalentQ mailing list -- quantum_spain_talentq@bsc.es <mailto:quantum_spain_talentq@bsc.es> To unsubscribe send an email to quantum_spain_talentq-leave@bsc.es <mailto:quantum_spain_talentq-leave@bsc.es>