TY - JOUR
T1 - Dc Magnetometry with Engineered Nitrogen-Vacancy Spin Ensembles in Diamond
AU - Balasubramanian, Priyadharshini
AU - Osterkamp, Christian
AU - Chen, Yu
AU - Chen, Xiuliang
AU - Teraji, Tokuyuki
AU - Wu, E.
AU - Naydenov, Boris
AU - Jelezko, Fedor
N1 - Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/9/11
Y1 - 2019/9/11
N2 - The exquisite optical and spin properties of nitrogen-vacancy (NV) centers in diamond have made them a promising platform for quantum sensing. The prospect of NV-based sensors relies on the controlled production of these atomic-scale defects. Here we report on the fabrication of a preferentially oriented, shallow ensemble of NV centers and their applicability for sensing dc magnetic fields. For the present sample, the residual paramagnetic impurities are the dominant source of environmental noise, limiting the dephasing time (T2∗) of the NVs. By controlling the P1 spin-bath, we achieve a 4-fold improvement in the T2∗ of the NV ensemble. Further, we show that combining spin-bath control and homonuclear decoupling sequence cancels NV-NV interactions and partially protects the sensors from a broader spin environment, thus extending the ensemble T2∗ up to 10 μs. With this decoupling protocol, we measure an improved dc magnetic field sensitivity of 1.2 nT μm3/2 Hz-1/2. Using engineered NVs and decoupling protocols, we demonstrate the prospects of harnessing the full potential of NV-based ensemble magnetometry.
AB - The exquisite optical and spin properties of nitrogen-vacancy (NV) centers in diamond have made them a promising platform for quantum sensing. The prospect of NV-based sensors relies on the controlled production of these atomic-scale defects. Here we report on the fabrication of a preferentially oriented, shallow ensemble of NV centers and their applicability for sensing dc magnetic fields. For the present sample, the residual paramagnetic impurities are the dominant source of environmental noise, limiting the dephasing time (T2∗) of the NVs. By controlling the P1 spin-bath, we achieve a 4-fold improvement in the T2∗ of the NV ensemble. Further, we show that combining spin-bath control and homonuclear decoupling sequence cancels NV-NV interactions and partially protects the sensors from a broader spin environment, thus extending the ensemble T2∗ up to 10 μs. With this decoupling protocol, we measure an improved dc magnetic field sensitivity of 1.2 nT μm3/2 Hz-1/2. Using engineered NVs and decoupling protocols, we demonstrate the prospects of harnessing the full potential of NV-based ensemble magnetometry.
KW - Nitrogen-vacancy center
KW - dc magnetic field sensing
KW - ensemble magnetometry
KW - preferential alignment
UR - https://www.scopus.com/pages/publications/85072133511
U2 - 10.1021/acs.nanolett.9b02993
DO - 10.1021/acs.nanolett.9b02993
M3 - 文章
C2 - 31430171
AN - SCOPUS:85072133511
SN - 1530-6984
VL - 19
SP - 6681
EP - 6686
JO - Nano Letters
JF - Nano Letters
IS - 9
ER -