@article{oai:repo.qst.go.jp:00049473,
 author = {Masuyama, Y. and Mizuno, K. and Ozawa, H. and Ishiwata, H. and Hatano, Y. and Ohshima, Takeshi and Iwasaki, T. and Hatano, M. and 大島 武},
 journal = {Review of Scientific Instruments},
 month = {Dec},
 note = {Ultimate sensitivity for quantum magnetometry using negatively charged  nitrogen-vacancy (NV) centers in a diamond is limited by a number of NV centers and coherence time. Microwave irradiation with a high and
homogeneous power density into a large detection volume is necessary to realize a highly sensitive magnetometer. In this study, we fabricate a microwave resonator to enhance the power density of the microwave field and an optical system. By the strong microwave field, 48 ns Rabi oscillation which is sufficiently faster than the phase relaxation time of NV centers is realized. In addition, combining with a decoupling pulse sequence (XY16), the spin coherence time (T2) extends to 27 times longer than that with a spin echo method. Consequently, we obtained an AC magnetic field sensitivity of 10.8 pt/
pHz using the dynamical decoupling pulse sequence.},
 title = {Extending coherence time of macro-scale diamond magnetometer by dynamical decoupling with coplanar waveguide resonator},
 volume = {89},
 year = {2018}
}