Mutsuko Hatano
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View article: Narrow Inhomogeneous Distribution and Charge State Stabilization of Lead‐Vacancy Centers in Diamond
Narrow Inhomogeneous Distribution and Charge State Stabilization of Lead‐Vacancy Centers in Diamond Open
Lead‐vacancy (PbV) centers in diamond with a large ground state splitting are expected to be a building block of quantum network nodes. Due to the heaviness of the Pb atom, it is challenging to fabricate high‐quality PbV centers with a nar…
View article: Highly Sensitive Magnetometer with Continuous Excitation Ramsey Protocol by Utilizing Long Dephasing Time of Millimeter‐Scale Spin Ensembles in (111) Diamond
Highly Sensitive Magnetometer with Continuous Excitation Ramsey Protocol by Utilizing Long Dephasing Time of Millimeter‐Scale Spin Ensembles in (111) Diamond Open
We developed a highly sensitive magnetometer with continuous excitation (CE) Ramsey protocol for (111) diamonds. The distinctive feature of the magnetometer is the magnet array and antenna design to realize a uniform bias field and efficie…
View article: Imaging AC magnetization response of soft magnetic thin films using diamond quantum sensors
Imaging AC magnetization response of soft magnetic thin films using diamond quantum sensors Open
The energy loss in inductor core is a significant limitation in high-frequency power electronics. For evaluating and optimizing soft magnets, simultaneous imaging of both amplitude and phase of AC stray fields beyond 10 kHz is crucial. Her…
View article: Heteroepitaxial (111) Diamond Quantum Sensors with Preferentially Aligned Nitrogen‐Vacancy Centers for an Electric Vehicle Battery Monitor
Heteroepitaxial (111) Diamond Quantum Sensors with Preferentially Aligned Nitrogen‐Vacancy Centers for an Electric Vehicle Battery Monitor Open
A platform for heteroepitaxial (111) chemical vapor deposition (CVD) diamond quantum sensors with preferentially aligned nitrogen vacancy (NV) centers on a large substrate is developed, and its operation as an electric vehicle (EV) battery…
View article: Performance Evaluation of a Diamond Quantum Magnetometer for Biomagnetic Sensing: A Phantom Study
Performance Evaluation of a Diamond Quantum Magnetometer for Biomagnetic Sensing: A Phantom Study Open
We employ a dry-type phantom to evaluate the performance of a diamond quantum magnetometer with a high sensitivity of about $6~\mathrm{pT/\sqrt{Hz}}$ from the viewpoint of practical measurement in biomagnetic sensing. The dry phantom is su…
View article: Charge state transition of spectrally stabilized tin-vacancy centers in diamond
Charge state transition of spectrally stabilized tin-vacancy centers in diamond Open
Solid-state quantum emitters are an important platform for quantum information processing. The fabrication of the emitters with stable photon frequency and narrow linewidth is a fundamental issue, and it is essential to understand optical …
View article: Transverse magnetic field effects on diamond quantum sensor for EV battery monitor
Transverse magnetic field effects on diamond quantum sensor for EV battery monitor Open
Key implementation points for achieving full accuracy in simultaneous temperature and magnetic field measurement and linearity when applying diamond quantum sensors to electric vehicle (EV) battery monitors were investigated. Both the stat…
View article: Compact and Stable Diamond Quantum Sensors for Wide Applications
Compact and Stable Diamond Quantum Sensors for Wide Applications Open
This study proposes compact, highly sensitive, and stable diamond quantum sensors for a wide range of applications, including biomedical and energy electronics. For enhanced sensitivity and alignment precision within the objective field, a…
View article: Fast coherent control of nitrogen-14 spins associated with nitrogen-vacancy centers in diamonds using dynamical decoupling
Fast coherent control of nitrogen-14 spins associated with nitrogen-vacancy centers in diamonds using dynamical decoupling Open
A nitrogen-vacancy (NV) center in a diamond enables the access to an electron spin, which is expected to present highly sensitive quantum sensors. Although exploiting a nitrogen nuclear spin improves the sensitivity, manipulating it using …
View article: A wide dynamic range diamond quantum sensor as an electric vehicle battery monitor
A wide dynamic range diamond quantum sensor as an electric vehicle battery monitor Open
To demonstrate the application capability of the diamond quantum sensor as an electric vehicle (EV) battery monitor, we (i) investigated the measurable current in a real car noise level and (ii) compared the linearity with conventional sen…
View article: Wide-field imaging of the magnetization process in soft magnetic-thin film using diamond quantum sensors
Wide-field imaging of the magnetization process in soft magnetic-thin film using diamond quantum sensors Open
The magnetization process of a soft magnetic CoFeB-SiO 2 thin film was imaged using diamond quantum sensors with perfectly aligned nitrogen-vacancy centers along the [111] direction formed by CVD. Around the film edge, the easy and hard ax…
View article: Extending Spin Dephasing Time of Perfectly Aligned Nitrogen‐Vacancy Centers by Mitigating Stress Distribution on Highly Misoriented Chemical‐Vapor‐Deposition Diamond
Extending Spin Dephasing Time of Perfectly Aligned Nitrogen‐Vacancy Centers by Mitigating Stress Distribution on Highly Misoriented Chemical‐Vapor‐Deposition Diamond Open
Extending the spin‐dephasing time ( T 2 * ) of perfectly aligned nitrogen‐vacancy (NV) centers in large‐volume chemical vapor deposition (CVD) diamonds leads to enhanced DC magnetic sensitivity. However, T 2 * of the NV centers is signific…
View article: Fast coherent control of nitrogen-14 spins associated with nitrogen-vacancy centers in diamonds using dynamical decoupling
Fast coherent control of nitrogen-14 spins associated with nitrogen-vacancy centers in diamonds using dynamical decoupling Open
A nitrogen-vacancy (NV) center in a diamond enables the access to an electron spin, which is expected to present highly sensitive quantum sensors. Although exploiting a nitrogen nuclear spin improves the sensitivity, manipulating it using …
View article: Diamond quantum magnetometer with dc sensitivity of < 10 pT Hz$^{-1/2}$ toward measurement of biomagnetic field
Diamond quantum magnetometer with dc sensitivity of < 10 pT Hz$^{-1/2}$ toward measurement of biomagnetic field Open
We present a sensitive diamond quantum sensor with a magnetic field sensitivity of $9.4 \pm 0.1~\mathrm{pT/\sqrt{Hz}}$ in a near-dc frequency range of 5 to 100~Hz. This sensor is based on the continuous-wave optically detected magnetic res…
View article: Transform-Limited Photon Emission From a Lead-Vacancy Center in Diamond Above 10 K
Transform-Limited Photon Emission From a Lead-Vacancy Center in Diamond Above 10 K Open
Transform-limited photon emission from quantum emitters is essential for high-fidelity entanglement generation. In this study, we report the coherent optical property of a single negatively-charged lead-vacancy (PbV) center in diamond. Pho…
View article: Extending spin dephasing time of perfectly aligned Nitrogen-Vacancy centers by mitigating stress distribution on highly misoriented chemical-vapor-deposition diamond
Extending spin dephasing time of perfectly aligned Nitrogen-Vacancy centers by mitigating stress distribution on highly misoriented chemical-vapor-deposition diamond Open
Extending the spin-dephasing time (T2*) of perfectly aligned nitrogen-vacancy (NV) centers in large-volume chemical vapor deposition (CVD) diamonds leads to enhanced DC magnetic sensitivity. However, T2* of the NV centers is significantly …
View article: Extension of Spin Dephasing Time of Continuously Excited Ensemble Nitrogen Vacancy Centers by Double‐Quantum Ramsey Magnetometry with Spin Bath Driving
Extension of Spin Dephasing Time of Continuously Excited Ensemble Nitrogen Vacancy Centers by Double‐Quantum Ramsey Magnetometry with Spin Bath Driving Open
Quantum magnetic sensors based on nitrogen vacancy (NV) centers are expected to be used for various biological and medical applications. Continuously excited (CE) Ramsey magnetometry is one of the most sensitive measurement protocols and h…
View article: Wide-field quantitative magnetic imaging of superconducting vortices using perfectly aligned quantum sensors
Wide-field quantitative magnetic imaging of superconducting vortices using perfectly aligned quantum sensors Open
Various techniques have been applied to visualize superconducting vortices, providing clues to their electromagnetic response. Here, we present a wide-field, quantitative imaging of the stray field of the vortices in a superconducting thin…
View article: Wide temperature operation of diamond quantum sensor for electric vehicle battery monitoring
Wide temperature operation of diamond quantum sensor for electric vehicle battery monitoring Open
Considering the rising popularity of electric vehicles (EVs), it is essential to enhance the cruising mileage and extend the lifetime of batteries. To accomplish this, accurate monitoring of the charge and discharge current of the battery …
View article: Over 100 μm thickness CVD diamond film with perfectly aligned nitrogen-vacancy centers on highly misoriented substrates
Over 100 μm thickness CVD diamond film with perfectly aligned nitrogen-vacancy centers on highly misoriented substrates Open
Thick CVD diamond film with perfectly aligned nitrogen-vacancy (NV) centers leads to highly sensitive quantum sensors. A misorientation angle ( θ mis ) of the (111) substrate is a key to determine the film thickness. We investigated the de…
View article: Transfer-printing-based integration of silicon nitride grating structure on single-crystal diamond toward sensitive magnetometers
Transfer-printing-based integration of silicon nitride grating structure on single-crystal diamond toward sensitive magnetometers Open
Negatively charged nitrogen-vacancy (NV) centers in diamond have emerged as promising candidates for a wide range of quantum applications, especially quantum sensing of magnetic field. Implementation of nanostructure into diamond is powerf…
View article: High-precision robust monitoring of charge/discharge current over a wide dynamic range for electric vehicle batteries using diamond quantum sensors
High-precision robust monitoring of charge/discharge current over a wide dynamic range for electric vehicle batteries using diamond quantum sensors Open
Accurate prediction of the remaining driving range of electric vehicles is difficult because the state-of-the-art sensors for measuring battery current are not accurate enough to estimate the state of charge. This is because the battery cu…
View article: Identical Photons from Multiple Tin-Vacancy Centers in Diamond
Identical Photons from Multiple Tin-Vacancy Centers in Diamond Open
We report the narrow inhomogeneous distribution of the zero-phonon line from tin-vacancy (SnV) centers in diamond and the overlap of spectra from multiple separated SnV centers. Photoluminescence excitation spectroscopy measurements at a c…
View article: Coherence of a charge stabilised tin-vacancy spin in diamond
Coherence of a charge stabilised tin-vacancy spin in diamond Open
Quantum information processing (QIP) with solid state spin qubits strongly depends on the efficient initialisation of the qubit’s desired charge state. While the negatively charged tin-vacancy (SnV − ) centre in diamond has emerged as an e…
View article: Coherence of a charge stabilised tin-vacancy spin in diamond
Coherence of a charge stabilised tin-vacancy spin in diamond Open
Colour centres in diamond have recently emerged as competitive platforms in the field of QIP . In particular the G4V centres combine long spin coherence times with favourable optical properties such as large Debye-Waller factors and transf…