44 citations · 250 across the 29 of their papers we have counts for
8 papers · 1 filter
Demonstration of highly-sensitive wideband microwave sensing using ensemble nitrogen-vacancy centers
Kensuke Ogawa, Shunsuke Nishimura, Kento Sasaki +1
Microwave magnetometry is essential for the advancement of microwave technologies. We demonstrate a broadband microwave sensing protocol using the AC Zeeman effect with ensemble ni…
Suppression of Pulsed Dynamic Nuclear Polarization by Many-Body Spin Dynamics
Kento Sasaki, Eisuke Abe
We study a mechanism by which nuclear hyperpolarization due to the polarization transfer from a microwave-pulse-controlled electron spin is suppressed. From analytical and numerica…
Optical-power-dependent splitting of magnetic resonance in nitrogen-vacancy centers in diamond
Shuji Ito, Moeta Tsukamoto, Kensuke Ogawa +3
Nitrogen-vacancy (NV) centers in diamonds are a powerful tool for accurate magnetic field measurements. The key is precisely estimating the field-dependent splitting width of the o…
Nitrogen isotope effects on boron vacancy quantum sensors in hexagonal boron nitride
Kento Sasaki, Takashi Taniguchi, Kensuke Kobayashi
There has been growing interest in studying hexagonal boron nitride (hBN) for quantum technologies. Here, we investigate nitrogen isotope effects on boron vacancy (V) de…
Demonstration of geometric diabatic control of quantum states
Kento Sasaki, Yuki Nakamura, Tokuyuki Teraji +2
Geometric effects can play a pivotal role in streamlining quantum manipulation. We demonstrate a geometric diabatic control, that is, perfect tunneling between spin states in a dia…
Frequency-tunable magnetic field sensing using continuous-wave optically detected magnetic resonance with nitrogen-vacancy centers in diamond
Ryusei Okaniwa, Takumi Mikawa, Yuichiro Matsuzaki +8
The nitrogen-vacancy (NV) center is a promising candidate to realize practical quantum sensors with high sensitivity and high spatial resolution, even at room temperature and atmos…
Wide-field quantitative magnetic imaging of superconducting vortices using perfectly aligned quantum sensors
Shunsuke Nishimura, Taku Kobayashi, Daichi Sasaki +5
Various techniques have been applied to visualize superconducting vortices, providing clues to their electromagnetic response. Here, we present a wide-field, quantitative imaging o…
Magnetic field imaging by hBN quantum sensor nanoarray
Kento Sasaki, Yuki Nakamura, Hao Gu +8
Placing a sensor close to the target at the nano-level is a central challenge in quantum sensing. We demonstrate high-spatial-resolution magnetic field imaging with a boron vacancy…