Dresden 2026 – scientific programme

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QI: Fachverband Quanteninformation

QI 16: Quantum Software

QI 16.1: Invited Talk

Thursday, March 12, 2026, 09:30–10:00, BEY/0245

Measurement-free universal fault-tolerant quantum computation — •Friederike Butt^{1, 2}, Ivan Pogorelov³, Alex Steiner³, Marcel Meyer³, Thomas Monz^{3, 4}, Markus Müller^{1, 2}, and Robert Freund³ — ¹Institute for Theoretical Nanoelectronics (PGI-2), Forschungszentrum Jülich — ²Institute for Quantum Information, RWTH Aachen University — ³Universität Innsbruck, Institut für Experimentalphysik, Innsbruck — ⁴Alpine Quantum Technologies GmbH, Innsbruck

The ability to perform quantum error correction (QEC) and robust gate operations on encoded qubits opens the door to demonstrations of quantum algorithms. Contemporary QEC schemes typically require mid-circuit measurements with feed-forward control, which are challenging for qubit control, often slow, and susceptible to relatively high error rates. I will present protocols and the experimental realization of a universal toolbox of fault-tolerant logical operations without mid-circuit measurements on a trapped-ion quantum processor. This includes modular logical state teleportation between two four-qubit error-detecting codes without measurements during algorithm execution, as well as a fault-tolerant universal gate set on an eight-qubit error-detecting code hosting three logical qubits, based on state injection, which can be executed by coherent gate operations only. This toolbox can then be used to realize Grover’s quantum search algorithm fault-tolerantly on three logical qubits encoded in eight physical qubits, with the implementation displaying clear identification of the desired solution states.

Keywords: Fault-tolerance; Measurement-free quantum computing; Universal quantum computing