Compromise-free scaling of qubit speed and coherence

Miguel J. Carballido (), Simon Svab, Rafael S. Eggli, Taras Patlatiuk, Pierre Chevalier Kwon, Jonas Schuff, Rahel M. Kaiser, Leon C. Camenzind, Ang Li, Natalia Ares, Erik P. A. M. Bakkers, Stefano Bosco, J. Carlos Egues, Daniel Loss and Dominik M. Zumbühl ()
Additional contact information
Miguel J. Carballido: University of Basel
Simon Svab: University of Basel
Rafael S. Eggli: University of Basel
Taras Patlatiuk: University of Basel
Pierre Chevalier Kwon: University of Basel
Jonas Schuff: University of Oxford
Rahel M. Kaiser: University of Basel
Leon C. Camenzind: University of Basel
Ang Li: TU Eindhoven
Natalia Ares: University of Oxford
Erik P. A. M. Bakkers: TU Eindhoven
Stefano Bosco: University of Basel
J. Carlos Egues: University of Basel
Daniel Loss: University of Basel
Dominik M. Zumbühl: University of Basel

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Across leading qubit platforms, a common trade-off persists: increasing coherence comes at the cost of operational speed, reflecting the notion that protecting a qubit from its noisy surroundings also limits control over it. This speed-coherence dilemma limits qubit performance across various technologies. Here, we demonstrate a hole spin qubit in a Ge/Si core/shell nanowire that triples its Rabi frequency while simultaneously quadrupling its Hahn-echo coherence time, boosting the Q-factor by over an order of magnitude. This is enabled by the direct Rashba spin-orbit interaction, emerging from heavy-hole-light-hole mixing through strong confinement in two dimensions. Tuning a gate voltage causes this interaction to peak, providing maximum drive speed and a point where the qubit is optimally protected from charge noise, allowing speed and coherence to scale together. Our proof-of-concept shows that careful dot design can overcome a long-standing limitation, offering a new approach towards building high-performance, fault-tolerant qubits.

Date: 2025
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DOI: 10.1038/s41467-025-62614-z

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