10 papers
Geometric estimation of NV charge-state contributions from a low-dimensional spectral representation
Yuto Yamakawa, Keisuke Oshimi, Keigo Arai
Nitrogen-vacancy (NV) centers in diamond exist in neutral (NV0) and negatively charged (NV-) states, and quantifying their respective photoluminescence (PL) contributions is import…
Current-dipole detection of microscale metal defects
Eikichi Kimura, Eisuke Oba, Yu Saito +6
An effective electric current dipole provides a compact description of localized current disturbances and has been employed across a broad range of physical systems and length scal…
Diamond quantum-sensing platform with integrated boron-doped diamond microwave antenna and thermometer
Masahiro Ohkuma, Ryo Matsumoto, Shintaro Adachi +5
Wide-field nitrogen-vacancy (NV) magnetic imaging at cryogenic temperatures requires microwave excitation and reliable knowledge of the temperature near the sensing region. Here, w…
Universal scaling of electrochemical information transfer at solid-liquid interfaces
Eikichi Kimura, Ashutosh Rathi, Saki Tsuchiya +6
Electrochemical potentials at solid-liquid interfaces govern diverse chemical and energy conversion processes; however, the extent to which their electrochemical influence extends…
Fisher Glasses: Tail-Certified Quantum Metrology in Quenched Environments
El Mustapha Mansouri, Keigo Arai
Quantum metrological advantage is certified by averaged Fisher responses: contrast, susceptibility, or quantum Fisher information (QFI). This fails in quenched sensors, where slow…
Wide-field NV magnetometry under simultaneous high-pressure and high-temperature conditions
Masahiro Ohkuma, Eikichi Kimura, Shumpei Ohyama +7
We demonstrate wide-field optically detected magnetic resonance (ODMR) under simultaneous high-pressure and high-temperature conditions using nitrogen-vacancy (NV) centers. Althoug…
Crystallographic Symmetry Generates Phononic Holonomic Gates with Biased-Erasure Channels
El Mustapha Mansouri, Keigo Arai
Solid-state processors require control layers whose errors are legible to quantum-error-correction decoders. We show that crystallographic symmetry can provide such a layer in stra…
Probing the Meissner effect in single crystals of via wide-field quantum microscopy under high pressure
Masahiro Ohkuma, Ryo Matsumoto, Shintaro Adachi +5
We investigated the pressure dependence of the superconducting transition temperature () in optimally doped BiSrCaCuO (Bi-2223) single crystals…
Optically detected magnetic resonance of nitrogen-vacancy centers in microdiamonds inside nanopolycrystalline diamond anvil cell
Masahiro Ohkuma, Keigo Arai, Kenji Ohta +4
We demonstrated optically detected magnetic resonance (ODMR) of nitrogen-vacancy (NV) centers in microdiamonds inside a diamond anvil cell pressurized with nanopolycrystalline diam…
Coherent control of solid-state defect spins via patterned boron-doped diamond circuit
Masahiro Ohkuma, Eikichi Kimura, Eunsang Lee +8
Monolithic integration, which refers to the incorporation of all device functionalities within a single material, shows significant potential for creating scalable solid-state quan…