Spin-orbit-enabled realization of arbitrary two-qubit gates on moving spins

• URL: http://arxiv.org/abs/2508.08394v1
• Date: Mon, 11 Aug 2025 18:35:17 GMT
• Title: Spin-orbit-enabled realization of arbitrary two-qubit gates on moving spins
• Authors: D. Fernández-Fernández, Y. Matsumoto, L. M. K. Vandersypen, G. Platero, S. Bosco,
• Abstract summary: Large spin-orbit interaction (SOI) can be harnessed to implement an arbitrary high-fidelity two-qubit (2Q) gate.<n>We show that an arbitrary high-fidelity 2Q gate can be realized by controlling the shuttling speed and waiting times.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Shuttling spin qubits in systems with large spin-orbit interaction (SOI) can cause errors during motion. However, in this work, we demonstrate that SOI can be harnessed to implement an arbitrary high-fidelity two-qubit (2Q) gate. We consider two spin qubits defined in a semiconductor double quantum dot that are smoothly moved toward each other by gate voltages. We show that an arbitrary high-fidelity 2Q gate can be realized by controlling the shuttling speed and waiting times, and leveraging strong intrinsic or extrinsic SOI. Crucially, performing 2Q operations during qubit transport enables a one-step realization of a wide range of 2Q gates, which often involve several steps when implemented using static dots. Our findings establish a practical route toward direct implementation of any 2Q gate via spin shuttling, significantly reducing control overhead in scalable quantum computing architectures.

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