High-fidelity spin qubit shuttling via large spin-orbit interaction

Abstract

Shuttling spins with high fidelity is a key requirement to scale up semiconducting quantum computers, enabling qubit entanglement over large distances and favoring the integration of control electronics on-chip. To decouple the spin from the unavoidable charge noise, state-of-the-art spin shuttlers try to minimize the inhomogeneity of the Zeeman field. However, this decoupling is challenging in otherwise promising quantum computing platforms such as hole spin qubits in silicon and germanium, characterized by a large spin-orbit interaction and electrically-tunable qubit frequency. In this work, we show that, surprisingly, the large inhomogeneity of the Zeeman field stabilizes the coherence of a moving spin state, thus enabling high-fidelity shuttling also in these systems. We relate this enhancement in fidelity to the deterministic dynamics of the spin which filters out the dominant low-frequency contributions of the charge noise. By simulating several different scenarios and noise sources, we show that this is a robust phenomenon generally occurring at large field inhomogeneity. By appropriately adjusting the motion of the quantum dot, we also design realistic protocols enabling faster and more coherent spin shuttling. Our findings are generally applicable to a wide range of setups and could pave the way toward large-scale quantum processors.

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Cited by in corpus (14)

• Strategies for enhancing spin-shuttling fidelities in Si/SiGe quantum wells with random-alloy disorder
• Towards early fault tolerance on a 2$\times$N array of qubits equipped with shuttling
• Single-step high-fidelity three-qubit gates by anisotropic chiral interactions
• Dephasing of planar Ge hole spin qubits due to 1/$\text{f}$ charge noise
• Partial Landau-Zener transitions and applications to qubit shuttling
• A spinless spin qubit
• Topological Spin Textures Enabling Quantum Transmission
• Electrical Interconnects for Silicon Spin Qubits
• Decoherence and fidelity enhancement during shuttling of entangled spin qubits
• Micromagnet-free operation of electron spin qubits in Si/Si${}_{1-x}$Ge${}_x$ vertical double quantum dots
• Robust applicability of continuous dynamical decoupling to decoherence reduction in longitudinal and transverse-noise settings: The role of anisotropy
• Sweet-spot protection of hole spins in sparse arrays via spin-dependent magnetotunneling
• Robust Tripartite Entanglement Generation via Correlated Noise in Spin Qubits
• Spin qubit shuttling between coupled quantum dots with inhomogeneous Landé g-tensors