A study of molecular electron spin ensemble systems suitable for quantum spin memories coupled with superconducting flux qubit circuits

2015 Fiscal Year Final Research Report

• Project/Area Number: 25410098
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Functional solid state chemistry
• Research Institution: Osaka City University
• Principal Investigator: NAKAZAWA SHIGEAKI 大阪市立大学, 大学院理学研究科, 特任准教授 (70342821)
• Co-Investigator(Kenkyū-buntansha): TAKUI Takeji 大阪市立大学, 大学院理学研究科, 特任教授 (10117955)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 量子情報処理 / 量子メモリー / 電子スピン共鳴 / 三重項ジラジカル / 希釈単結晶 / 超伝導磁束量子ビット

Outline of Final Research Achievements

Hybridization between molecular spin ensemble qubits and superconducting flux qubit circuits has been targeted by using ground-state triplet organic molecules with large fine-structure constants. We have found that one of the stable triplet diradicals in the ground state has a large D value (-0.0655 cm-1), the largest among the ground-state triplet (S = 1) nitroxide-based diradicals documented so far.
The magnetically diluted single crystals were obtained by cocrystallization of a mixture of the diradical and diamagnetic host molecule which molecular structure corresponds to that of the diradical with replacement of NO groups by CO groups. The fine-structure (D) tensors of the diradical and its analog in the single crystals were determined by single-crystal ESR spectrosopy. We have solved a technical issue on flattening the surface of the small single crystals, which ensures good physical contact between the spin crystal and the circuit.

Free Research Field

スピン科学