[16p-A408-1~18] 6.2 Carbon-based thin films

[16p-A408-5] Characterization of HPHT Diamonds for Bulk-Ensemble NV-based High-Sensitivity DC Magnetometer

〇Takeharu Sekiguchi¹, Yuki Kamitsubo¹, Takeyuki Tsuji¹, Yuta Masuyama², Takashi Taniguchi³, Masashi Miyakawa³, Chikara Shinei³, Shinobu Onoda², Hiroyuki Abe², Seiichi Saiki², Shuya Ishii², Tokuyuki Teraji³, Takeshi Ohshima², Takayuki Iwasaki¹, Mutsuko Hatano^1,2 (1.Tokyo Tech, 2.QST, 3.NIMS)

Keywords:diamond, dephasing time, quantum sensor

HPHT Diamonds for Bulk-Ensemble NV-based High-Sensitivity DC Magnetometer were characterized in terms of T2 and T2*. Spin-concentration dependent contributions of the bath spins and strain to the dephasing rate 1/T2* were analyzed to estimated the optimal concentration in terms of the material factor in the photon-shot-noise limited DC-field sensitivity. Improvements in quality of diamond samples and sensing method would lead to 2 orders-of-magnitude enhancement of the sensitivity.