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Compromise-Free Scaling of Qubit Speed and Coherence

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arxiv 2402.07313 v3 pith:YEHF44XI submitted 2024-02-11 cond-mat.mes-hall

Miguel J. Carballido , Simon Svab , Rafael S. Eggli , Taras Patlatiuk , Pierre Chevalier Kwon , Jonas Schuff , Rahel M. Kaiser , Leon C. Camenzind
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Ang Li Natalia Ares Erik P.A.M Bakkers Stefano Bosco J. Carlos Egues Daniel Loss Dominik M. Zumbühl
This is my paper · ORCID
classification cond-mat.mes-hall
keywords qubitcoherencespeedacrossinteractionlimitsallowingapproach
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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.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Fast readout of quantum dot spin qubits via Andreev spins

    cond-mat.mes-hall 2025-06 conditional novelty 6.0 of 10

    A switchable quantum-dot-plus-Andreev-spin coupler can read a germanium dot-spin qubit in under a microsecond with theoretical fidelity above 99.9%.

  2. Fully Tunable Strong Spin-Orbit Interactions in Light Hole Germanium Quantum Channels

    cond-mat.mes-hall 2025-06 conditional novelty 6.0 of 10

    Simulations show a MOS-like Ge/GeSn heterostructure with a light-hole ground state has large and electrically switchable Rashba spin-orbit coupling and a gate-tunable out-of-plane g-factor.

  3. Hole-spin qubits in germanium beyond the single-particle regime

    cond-mat.mes-hall 2025-05 conditional novelty 6.0 of 10

    A numerical study of three-hole spin qubits in germanium quantum dots predicts Rabi frequencies up to two orders of magnitude larger than single-hole qubits in quasi-circular dots, with comparable or better quality factors.

  4. A direct dispersive signature of Pauli spin blockade

    cond-mat.mes-hall 2025-06 conditional novelty 5.0 of 10

    Pauli spin blockade is observed directly in gate-dispersive reflectometry as a strong modulation of the reservoir charge transitions in Ge/Si nanowire and Si FinFET double quantum dots.

  5. Readout sweet spots for spin qubits with strong spin-orbit interaction

    quant-ph 2025-05 accept novelty 5.0 of 10

    Readout back-action in spin qubits from g-tensor modulation is minimized when the magnetic field is oriented so the static Zeeman field is parallel to the sensor-induced Zeeman fluctuation (gB parallel to g'B), a cond...

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