JP5831947B2 - 磁場検出装置および磁場検出方法 - Google Patents
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Description
基底状態に偏極させた電子スピンにマイクロ波を照射することで、以下の式(1)で示される重ね合わせ状態を作る。
レーザー光とマイクロ波を用いることで、電子スピンの状態をσxの基底で読み出し(測定し)、測定値を記録する。
Claims (3)
- ダイヤモンド格子中の炭素の置換位置に入った窒素と、この置換窒素に隣接する炭素原子が抜けた空孔との対からなる複合不純物欠陥であるNV中心を有するダイヤモンドからなる検出素子のNV中心における核スピンを重ね合わせ状態とする核スピン状態制御ステップと、
前記検出素子のNV中心における電子スピンを基底状態に偏極させる電子スピン状態制御ステップと、
前記検出素子のNV中心における重ね合わせ状態とされた前記核スピンおよび前記基底状態とされた電子スピンをエンタングル状態にするエンタングル状態ステップと、
前記核スピンおよび前記電子スピンが前記エンタングル状態ステップでエンタングル状態とされた後、設定されている時間保持して前記電子スピンを測定対象の磁場に相互作用させる相互作用ステップと、
前記相互作用ステップを行った後、エンタングル状態の前記核スピンおよび前記電子スピンを、エンタングル状態から解除するエンタングル解除ステップと、
前記エンタングル解除ステップでエンタングル状態ではない状態とした後で、重ね合わせ状態とされた前記核スピンの状態を前記核スピンの状態がデコヒーレンスする時間維持する核スピン状態維持ステップと、
前記核スピン状態維持ステップの後で、重ね合わせ状態とされた前記核スピンの状態と前記電子スピンの状態とを交換する状態交換ステップと、
前記交換ステップにより重ね合わせ状態とされた前記核スピンの状態が交換された前記電子スピンの状態を前記検出素子にレーザー光を照射することで検出する電子スピン状態検出ステップと
を少なくとも備えることを特徴とする磁場検出方法。 - ダイヤモンド格子中の炭素の置換位置に入った窒素と、この置換窒素に隣接する炭素原子が抜けた空孔との対からなる複合不純物欠陥であるNV中心を有するダイヤモンドからなる検出素子と、
前記検出素子のNV中心における核スピンを重ね合わせ状態とする核スピン状態制御手段と、
前記検出素子のNV中心における電子スピンを基底状態に偏極させる電子スピン状態制御手段と、
前記検出素子のNV中心における重ね合わせ状態とされた前記核スピンおよび前記基底状態とされた前記電子スピンをエンタングル状態とエンタングル状態ではない状態とに制御するエンタングル制御手段と、
重ね合わせ状態とされた前記核スピンの状態を前記核スピンの状態がデコヒーレンスする時間維持する核スピン状態維持手段と、
重ね合わせ状態とされた前記核スピンの状態と基底状態とされた前記電子スピンの状態とを交換する状態交換手段と、
前記状態交換手段により重ね合わせ状態とされた前記核スピンの状態が交換された前記電子スピンの状態をレーザー光が照射された前記検出素子より検出する電子スピン状態検出手段と
を少なくとも備えることを特徴とする磁場検出装置。 - 請求項2記載の磁場検出装置において、
前記検出素子にマイクロ波を照射するマイクロ波照射部および前記検出素子にレーザー光を照射する光源を備え、
前記核スピン状態制御手段は、前記マイクロ波照射部により前記検出素子のNV中心における核スピンに共鳴する周波数のマイクロ波を照射し、
電子スピン状態制御手段は、前記光源により前記検出素子にレーザー光を照射して前記検出素子のNV中心における電子スピンを基底状態に偏極させ、
電子スピン状態検出手段は、前記光源により前記検出素子にレーザー光を照射した前記検出素子から放出される光子を検出する光子検出部である
ことを特長とする磁場検出装置。
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