予想外の材料を用いた量子ビットの生成（Qubits created using unexpected materials）

2026-03-18 リンショーピング大学

Researchers at Linköping University have created a qubit that is based on the so-called spin of electrons in a perovskite.

＜関連情報＞

• https://liu.se/en/news-item/kvantbitar-skapas-med-ovantade-material
• https://www.nature.com/articles/s41467-025-67980-2

遷移金属イオンをドープしたハロゲン化物二重ペロブスカイトにおけるスピン量子ビット候補 Spin Qubits Candidate in Transition-Metal-Ion doped Halide Double Perovskites

Sakarn Khamkaeo,Kunpot Mopoung,Kingshuk Mukhuti,Maarten W. de Dreu,Anna Dávid,Muyi Zhang,Mats Fahlman,Feng Gao,Peter C. M. Christianen,Irina A. Buyanova,Weimin M. Chen & Yuttapoom Puttisong
Nature Communications  Published:08 January 2026
DOI:https://doi.org/10.1038/s41467-025-67980-2

Abstract

Solid-state spin qubits offer a promising route toward scalable quantum technologies. Here we demonstrate that, despites of a nuclear-spin-rich host of halide double perovskites (HDPs), transition-metal centers (Cr³⁺ and Fe³⁺ ions) are a good candidate for spin qubits exhibiting long-lived electron spin coherence with T₂ = 29.5 µs and 21.2 µs at 4 K, respectively. Notably, spin localization facilitates a well-defined electron-nuclear (e-N) spin rotation between the electron spin and the neighboring nuclear spins of ^35,37Cl and¹³³Cs. The resulting e-N spin cluster is readily beneficial for a target nuclear-spin sensing. For the Cr³⁺ spin centers, the optical transitions associated with Cr³⁺ spin centers is spin-selective thereby paving a way for optical addressing of spins. Our findings from these spin ensemble studies establish HDPs as a new promising platform for creating solid-state spin qubits using simple and inexpensive solution-based single crystal growth methods, broadening material applications of halide perovskites.