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Overview
Overview
Our laboratory develops quantum sensors based on spin defects in solids, with a primary focus on nitrogen-vacancy (NV) centers in diamond. Our research aims to improve quantum sensing performance by approaching the standard quantum limit (SQL) with NV ensembles through pulse engineering and nanostructured diamond, and surpassing the SQL using entangled single NV spins. We also explore practical applications, including quantum diamond microscopy for biomedical imaging, and investigate alternative solid-state defects for quantum sensing.
1. NV Ensembles: toward the SQL
1. NV Ensembles: toward the SQL
Our research aims to bring NV ensemble magnetometers closer to the standard quantum limit (SQL) by extending spin coherence and improving fluorescence collection. We combine advanced pulse control with diamond photonic structures to overcome the limitations imposed by spin-bath decoherence and inefficient optical readout
Coherence Engineering: Tailored multi-pulse sequences to suppress spin-spin interactions and extend coherence NV ensembles.
Diamond Photonic Structures: Nanopillars, gratings, and other photonic structures to enhance fluorescence collection efficiency.
SQL-limited Quantum Sensing: Integration of extended spin coherence and efficient optical readout toward spin-projection-noise-limited magnetometry.
2. Single NV centers: beyond the SQL
2. Single NV centers: beyond the SQL
Our research explores quantum sensing beyond the standard quantum limit using single NV centers and their nearby nuclear spins. We develop entanglement-enhanced sensing protocols at both room and cryogenic temperatures, aiming to improve sensitivity and spectral resolution for nanoscale NMR and MRI applications
Entanglement-Enhanced Quantum Sensing: High-fidelity control and entanglement of electron and nuclear spins at room and cryogenic temperatures to achieve sensing beyond the SQL.
Nanoscale NMR/MRI: Development of nanoscale magnetic resonance spectroscopy and imaging techniques toward single-molecule NMR and high-resolution spin imaging.
3. Quantum Diamond Sensing: Imaging and Applications
3. Quantum Diamond Sensing: Imaging and Applications
Our research develops diamond-based quantum sensing techniques for high-resolution imaging and localized magnetic field measurements. We use NV ensembles for wide-field magnetic imaging with quantum diamond microscopy (QDM) and explore miniaturized, fiber-coupled quantum sensors for endoscopic measurements. These techniques aim to enable applications ranging from biological diagnostics to semiconductor device characterization.
Quantum Diamond Microscopy: Wide-field magnetic imaging for the characterization of biological samples, magnetic nanoparticles, and semiconductor devices.
Endoscopic Quantum Sensing: Development of miniaturized, fiber-coupled diamond quantum sensors for localized magnetic field measurements in confined and hard-to-access environments.
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