量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
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The nitrogen-vacancy center in diamond is an exquisite solid-state sensor based upon quantum nature. Numerous studies have shown that dynamical decoupling, such as an XY8 sequence, provides us a high sensitivity for an oscillating magnetic field parametrized by amplitude and phase. However, there are some drawbacks. (1) A measurement using XY8 requires a careful adjustment of timings between XY8 sequences and the target signal. (2) The XY8 has an intricate dependence on both parameters, so it is not applicable in a situation that both parameters simultaneously change. (3) It is impossible to measure both parameters simultaneous, and they have to be measured severally. In this study, we present that Qdyne1-3, a quantum-classical hybrid protocol, solves them, consisted of sequential and stroboscopic measurements. The Qdyne does not require a timing adjustment before itself, has an intuitive dependency on both parameters, and let us a simultaneous measurement of both amplitude and phase. Moreover, we implemented it on a widefield of view. The large observation area of widefield modality and the high spatial resolution of NV center pave the way for a tiny-scale inspection by Eddy-current, which established sensors cannot detect.
会議概要（会議名, 開催地, 会期, 主催者等）
The 2nd International Forum on Quantum Metrology and Sensing への出席
Simultaneous amplitude and phase imaging of AC magnetic signal on wide field setup
