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HL: Fachverband Halbleiterphysik
HL 38: Materials and Devices for Quantum Technology II
HL 38.4: Vortrag
Donnerstag, 12. März 2026, 10:15–10:30, POT/0051
Spin-orbit-enabled realization of arbitrary two-qubit gates on moving spins — •David Fernández-Fernández1, Yuta Matsumoto2, Lieven M.K. Vandersypen2, Gloria Platero1, and Stefano Bosco2 — 1Instituto de Ciencia de Materiales de Madrid, CSIC, Spain — 2QuTech and Kavli Institute of Nanoscience, Delft University of Technology, The Netherlands
Shuttling spin qubits across semiconductor quantum dot arrays is emerging as a key primitive for scalable quantum information processing, enabling on-chip inter-node quantum communication and modular architectures. By analyzing the shuttling of two spin qubits towards each other using a conveyor-mode protocol, we show that controlling only two experimentally accessible parameters, the shuttling velocity and the waiting time at minimum interdot separation, is sufficient to synthesize a broad class of entangling gates. Moderate SOI provides direct access to both CPHASE(θ) and SWAPα families, as well as native fermionic-simulation gates, all with fidelities above 99.99% neglecting decoherence. We further quantify gate accessibility through a Weyl-chamber analysis and demonstrate that strong SOI or engineered helical magnetic fields can unlock nearly complete (∼ 99.98%) coverage of all locally inequivalent 2Q operations, including quantum gates such as the Berkeley gate. This work provides a realistic and scalable route toward single-step 2Q gates on mobile spin qubits, with immediate implications for distributed quantum computing, quantum simulation, and shuttling-assisted error-correcting architectures.
Keywords: Semiconductor spin qubits; Spin shuttling; Two-qubit gates; Conveyor-mode; Quantum dots