| 研究課題/領域番号 |
23K26488
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| 補助金の研究課題番号 |
23H01795 (2023)
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| 研究種目 |
基盤研究(B)
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| 配分区分 | 基金 (2024)
補助金 (2023) |
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| 応募区分 | 一般 |
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| 審査区分 |
小区分28020:ナノ構造物理関連
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| 研究機関 | 沖縄科学技術大学院大学 |
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研究代表者 |
コンスタンチノフ デニス 沖縄科学技術大学院大学, 量子ダイナミクスユニット, 教授 (50462685)
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| 研究期間 (年度) |
2023-04-01 – 2027-03-31
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| 研究課題ステータス |
交付 (2024年度)
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| 配分額 *注記 |
18,590千円 (直接経費: 14,300千円、間接経費: 4,290千円)
2026年度: 1,820千円 (直接経費: 1,400千円、間接経費: 420千円)
2025年度: 7,670千円 (直接経費: 5,900千円、間接経費: 1,770千円)
2024年度: 4,290千円 (直接経費: 3,300千円、間接経費: 990千円)
2023年度: 4,810千円 (直接経費: 3,700千円、間接経費: 1,110千円)
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| キーワード | spin-qubit gates / electron spin / trapped electrons / superfluid helium / electrons on helium / Rydberg states / cryogenic HEMT amplifier / resonant LC circuit / spin qubits / quantum gates / microchannel devices / Rydberg resonance |
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| 研究開始時の研究の概要 |
This research project attempts to utilize the ultra-clean system of electrons trapped on the surface of superfluid helium for quantum computing. In particular, the spin state of such electrons which is predicted to have extremely long coherence time is used to realize high-fidelity qubit gates.
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| 研究実績の概要 |
In accordance with the "Purpose of the research" and "Research plan" for this grant, in FY2023 we have developed a new sensitive transconductance amplifier to detect the Rydberg transition of electrons trapped on the surface of superfluid helium. The amplifier is based on a high-Q tank circuit, which converts the image current from electrons into a small voltage signal, followed by a cryogenic low-noise HEMT amplifier. The cryogenic testing of the amplifier demonstrated exceptionally good noise characteristics, with the voltage noise 0.6 nV per root Hz and the current noise 1.5 fA per root Hz (see publication list). Using this amplifier, we were able to demonstrate detection of the Rydberg resonance from about 100 electrons trapped in a microchannel device filled with supefluid helium.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The project progressed in FY2023 according to the plan. A resonant cryogenic amplifier has been built and the image-charge detection of the Rydberg transition of many electrons has been demonstrated.
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| 今後の研究の推進方策 |
The developed ultra-sensitive amplifier for the image current detection demonstrated an exceptionally good noise and gain characteristics (see publication list) which should sufficient to detect the Rydberg transition from a single trapped electron. The detection method has been successfully demonstrated on about 100 of electrons trapped in a microchannel device. Scaling of this device and detection method to a single trapped electron is the goal of the project in FY2024.
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