Published November 29, 2023
| Version v1
Dataset
Open
Supporting Data For: "Compromise-Free Scaling of Qubit Speed and Coherence" (V1)
Authors/Creators
-
Carballido, Miguel J.
(Contact person)1
-
Svab, Simon
(Project member)1
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Eggli, Rafael
(Project member)1
- Chevalier Kwon, Pierre (Project member)1
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Schuff, Jonas
(Project member)2
- Kaiser, Rahel M. (Project member)1
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Camenzind, Leon
(Project member)1
- Li, Ang (Project member)3
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Ares, Natalia
(Project member)2
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Bakkers, Erik
(Project member)3
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Bosco, Stefano
(Project member)1
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Egues, Jose Carlos
(Project member)4
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Loss, Daniel
(Project member)1
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Zumbühl, Dominik
(Supervisor)1
-
1.
University of Basel
-
2.
University of Oxford
-
3.
Eindhoven University of Technology
- 4. Universidade de São Paulo Instituto de Física de São Carlos
Description
Supporting Data For: "Compromise-Free Scaling of Qubit Speed and Coherence" (V1)
Miguel J. Carballido; Simon Svab; 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; Dominik M. Zumbühl
Nature Communications (2025), DOI: 10.1038/s41467-025-62614-z
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.
Files
Fig-1c_triangle_inset_woB.txt
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Additional details
Related works
- Is supplement to
- Journal article: 10.1038/s41467-025-62614-z (DOI)