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There are two major ways to achieve it. An analog signal processing method with a lock-in amplifier is fast to obtain the signal, but it increases the size of the sensor system. The digital signal processing method with the Fourier transform is simple, but it needs more computational resources. Reducing computational resources with the simple system is an important task for monitoring a real-time magnetic field. In this study, we demonstrate an alternative method of digital signal processing with less computational resources than the Fourier transform. The computational time of the method to compute the signal from n points of data is O(n), whereas the time with Fourier transform is O(n log n).\n\nMethod and Result\nWe confirm our method with a large detection volume of the ensemble NV centers. The microwave and optical systems used in our experiment are shown in Fig. 1. 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  1. 学会発表・講演等
  2. ポスター発表

Temperature measurement and annealing behavior of silicon vacancies in 4H-SiC

https://repo.qst.go.jp/records/79553
https://repo.qst.go.jp/records/79553
952980df-dc74-45a7-985d-cb445ca17541
Item type 会議発表用資料 / Presentation(1)
公開日 2020-03-18
タイトル
タイトル Temperature measurement and annealing behavior of silicon vacancies in 4H-SiC
言語
言語 eng
資源タイプ
資源タイプ識別子 http://purl.org/coar/resource_type/c_c94f
資源タイプ conference object
アクセス権
アクセス権 metadata only access
アクセス権URI http://purl.org/coar/access_right/c_14cb
著者 Minh Tuan, Hoang

× Minh Tuan, Hoang

WEKO 856314

Minh Tuan, Hoang

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Masuyama, Yuta

× Masuyama, Yuta

WEKO 856315

Masuyama, Yuta

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Yamazaki, Yuichi

× Yamazaki, Yuichi

WEKO 856316

Yamazaki, Yuichi

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Sato, Shinichiro

× Sato, Shinichiro

WEKO 856317

Sato, Shinichiro

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Ohshima, Takeshi

× Ohshima, Takeshi

WEKO 856318

Ohshima, Takeshi

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Iwasaki, Takayuki

× Iwasaki, Takayuki

WEKO 856319

Iwasaki, Takayuki

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Hisamoto, Digh

× Hisamoto, Digh

WEKO 856320

Hisamoto, Digh

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Hatano, Mutsuko

× Hatano, Mutsuko

WEKO 856321

Hatano, Mutsuko

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Masuyama, Yuta

× Masuyama, Yuta

WEKO 856322

en Masuyama, Yuta

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Yamazaki, Yuichi

× Yamazaki, Yuichi

WEKO 856323

en Yamazaki, Yuichi

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Sato, Shinichiro

× Sato, Shinichiro

WEKO 856324

en Sato, Shinichiro

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Ohshima, Takeshi

× Ohshima, Takeshi

WEKO 856325

en Ohshima, Takeshi

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Hatano, Mutsuko

× Hatano, Mutsuko

WEKO 856326

en Hatano, Mutsuko

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抄録
内容記述タイプ Abstract
内容記述 Introduction
Nitrogen-vacancy (NV) centers in diamond are promising solid-state quantum sensors. The sensor can potentially monitor the real-time magnetic field at room-temperature toward the brain-machine interface. One of the biggest challenges is to implement a highly sensitive sensor in a compact system. There are two major ways to achieve it. An analog signal processing method with a lock-in amplifier is fast to obtain the signal, but it increases the size of the sensor system. The digital signal processing method with the Fourier transform is simple, but it needs more computational resources. Reducing computational resources with the simple system is an important task for monitoring a real-time magnetic field. In this study, we demonstrate an alternative method of digital signal processing with less computational resources than the Fourier transform. The computational time of the method to compute the signal from n points of data is O(n), whereas the time with Fourier transform is O(n log n).

Method and Result
We confirm our method with a large detection volume of the ensemble NV centers. The microwave and optical systems used in our experiment are shown in Fig. 1. The diamond sample containing NV centers was placed between the microwave resonator and a compound parabolic concentrator1. We used a coplanar waveguide resonator (CWR) with a wide center electrode for strong and uniform microwave irradiation2. The power of microwave with frequency modulation is 25 dBm before the CWR. The 300 mW laser beam to the diamond was focused with a beam diameter of about 30 μm. The fluorescence from the NV centers was collected through the compound parabolic concentrator and detected using a photodiode. The detected signal of the photodiode is analyzed by digital signal processing. The method obtains the result using a digital filter that effectively becomes a sinc filter using the orthogonality of trigonometric functions by multiplication of the acquired data by a trigonometric function.
Figures 2 shows continuous-wave optical detected magnetic resonance (CW-ODMR) spectrum using the digital signal processing with a different modulation frequency of the microwave. The maximum slope and the noise of the signal become smaller with increasing the modulation frequency for different reasons. The low transition rate between quantum states of the NV center reduces the maximum slope for high modulation frequency. While the noise becomes smaller for high modulation frequency. We evaluate the maximum signal slope (Fig. 3) and noise level of the spectrum (Fig. 4). We found the reduction of the noise is greater than the reduction of the maximum slope.
This work was supported by MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) Grant Number JPMXS0118067395.
会議概要(会議名, 開催地, 会期, 主催者等)
内容記述タイプ Other
内容記述 The 2nd International Forum on Quantum Metrology and Sensing への出席
発表年月日
日付 2019-12-17
日付タイプ Issued
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