Events

   Semiconductor spin qubits for quantum networking

Akira Oiwa (SANEKN, The University of Osaka)

Date/Time: Tuesday, 1st April 2025 at 2:00 pm

Place: Room Rémy Lemaire K223, Institut Néel

Abstract: Semiconductor spin qubit is well recognized as a promising platform for scalable fault-tolerant quantum computers (FTQCs) because of relatively long spin coherence time in solid state devices and high-electrical tuneability of the quantum states (1). Indeed, the single qubit and two-qubit gate operation with high fidelity exceeding fault-tolerance threshold have been demonstrated (2,3,4). These achievements have ignited research for scaling up the qubits towards million qubit systems operating based on quantum error correction. The strategy for scaling-up to million qubits is not simply arranging qubits in neighbor to each other but building quantum networks by intermediate quantum state transfer or optical networking are considered as more effective routes to develop FTQCs. In this talk, we present the photon-polarization to spin quantum interface for connecting quantum computers to the optical quantum networks (5,6), a high-fidelity spin qubit operation in GaAs triple QD, and the acceleration of the adiabatic spin state transfer bringing a concept to shortcut to adiabaticity into the intermediate spin state transfer for middle range spin quantum link (7). (1) G. Burkard et al., Rev. Mod. Phys. 95, 025003 (2023). (2) J. Yoneda et al., Nature Nanotechology 13, 102 (2018). (3) A. Noiri et al., Nature 601, 338 (2022). (4) X. Xue et al., Nature 601, 343 (2022). (5) T. Fujita et al., Nature Commun. 10, 2991 (2019). (6) K. Kuroyama et al., Phys. Rev. B 10, 2991 (2019). (7) X.-F. Liu et al., Phys. Rev. Lett. 132, 027002 (2024).