Enhanced quantum magnetometry with a laser-written integrated photonic diamond chip
Cardiff University（卡迪夫大学）；Politecnico di Milano（米兰理工大学）；Institute for Photonics and Nanotechnologies (CNR-IFN)（光子与纳米技术研究所（CNR-IFN））；University of Calgary（卡尔加里大学）；Nanyang Technological University（南洋理工大学）
Yanzhao Guo, Giulio Coccia, Vinaya Kumar Kavatamane, Argyro N. Giakoumaki, Anton N. Vetlugin, Roberta Ramponi, Cesare Soci, Paul E. Barclay, John P. Hadden, Ant… 展开作者
Yanzhao Guo, Giulio Coccia, Vinaya Kumar Kavatamane, Argyro N. Giakoumaki, Anton N. Vetlugin, Roberta Ramponi, Cesare Soci, Paul E. Barclay, John P. Hadden, Anthony J. Bennett, Shane M. Eaton
An ensemble of negatively charged nitrogen-vacancy centers in diamond can act as a precise quantum sensor even under ambient conditions. In particular, to optimize thier sensitivity, it is crucial to increase the number of spins sampled and maximize their coupling to the detection system, without degrading their spin properties. In this paper, we demonstrate enhanced quantum magnetometry via a high-quality buried laser-written waveguide in diamond with a 4.5 ppm density of nitrogen-vacancy centers. We show that the waveguide-coupled nitrogen-vacancy centers exhibit comparable spin coherence properties as that of nitrogen-vacancy centers in pristine diamond using time-domain optically detected magnetic resonance spectroscopy. Waveguide-enhanced magnetic field sensing is demonstrated in a fiber-coupled integrated photonic chip, where probing an increased volume of high-density spins results in 63 pT$.$Hz $^{-1/2}$ of DC-magnetic field sensitivity and 20 pT$.$Hz $^{-1/2}$ of AC magnetic field sensitivity. This on-chip sensor realizes at least an order of magnitude improvement in sensitivity compared to the conventional confocal detection setup, paving the way for microscale sensing with nitrogen-vacancy ensembles.
Millimeter-scale rigid diamond probe for high sensitivity endoscopic-magnetometry applications
School of Instrumentation and Optoelectronic Engineering, Beihang University（北京航空航天大学仪器科学与光电工程学院）；Beijing Quantum Technology Research and Development Center（北京量子技术研发中心）
Master equation-based model for infrared-based magnetometry with nitrogen-vacancy centers in diamond cavities: a path to sub-picotesla sensitivity at sub-millimeter scales
Unconditional full vector magnetometry using spin selectivity in Nitrogen Vacancy centers in diamond
University of the Basque Country（巴斯克大学）；Centro de Fisica de Materiales (CFM), CSIC-UPV/EHU（材料物理中心，西班牙国家研究委员会/巴斯克大学）；Donostia International Physics Center（圣塞巴斯蒂安国际物理中心）；IKERBASQUE, Basque Foundation for Science（伊卡巴斯基克，巴斯克科学基金会）
Cavity-enhanced room-temperature magnetometry using absorption by nitrogen-vacancy centers in diamond
我们提出了一种基于金刚石中氮空位中心的腔增强型室温磁场传感器。使用与1042 nm自旋单态跃迁共振的光的吸收来检测磁共振。将金刚石放置在外部光学腔中以增强吸收，即使在室温下也观察到显著的吸收。我们证明了磁场灵敏度为2.5 nT/sqrt（Hz），并且对于几mW的红外线，设计了70 pT/sqrt（Hz）的光子散粒噪声限制灵敏度，并且对于90 um x 90 um 200 um的感测体积，设计了250 fT/sqrt（Hz）的量子投影噪声限制灵敏度。
Simultaneous Wide-field Imaging of Phase and Magnitude of AC Magnetic Signal Using Diamond Quantum Magnetometry
利用金刚石量子磁谱仪对交流磁信号进行频谱分析是一种很有前途的感应成像技术。传统的动态去耦（如XY8）提供了对振荡磁信号的高灵敏度，对幅度和相位具有复杂的依赖性，使每个参数的高吞吐量检测复杂化。在这项研究中，一个简单的测量方案，独立和同时检测的幅度和相位的顺序测量协议证明。宽场成像实验进行了振荡磁场与约100 $μ$平方米的观察面积。对于0.76 $μ$ T AC磁信号，单像素相位精度为$2.1^\circ$。我们的方法使潜在的应用，包括电感检测和阻抗成像。
High homogeneity permanent magnet for diamond magnetometry
Halbach磁体是封闭体积中的均匀磁场源，同时将杂散场保持在最小值。在这里，我们提出了一个10 cm内径的双Halbach环的设计、构造和表征，该环提供约105 mT的均匀（<100 ppm，1 x 1 x 0.5 cm 3）磁场，将用于金刚石基无微波宽场成像设置。最后的表征是用一种新型的基于纤维化金刚石的传感器在3D平移台上进行的，记录了所构建的Halbach阵列的高均匀性及其对拟议用途的适用性。
Competition between contrast and laser noise in laser threshold magnetometry using an external cavity diode laser
RMIT University（皇家墨尔本理工大学）；The University of Melbourne（墨尔本大学）；Fraunhofer Institute for Applied Solid State Physics IAF（弗劳恩霍夫应用固体物理研究所）；National Institutes for Quantum Science and Technology: QST（量子科学技术研究院）；Tohoku University（东北大学）；Adelaide University（阿德莱德大学）；MOGLabs
Robust gigahertz-range ac magnetometry with an ensemble of NV centers in diamond using concatenated continuous dynamical decoupling
Ulm University（乌尔姆大学）；Racah Institute of Physics, The Hebrew University of Jerusalem（拉卡物理研究所，耶路撒冷希伯来大学）；Advanced Materials Laboratory, Sumitomo Electric Industries Ltd.（住友电工株式会社先进材料实验室）；Quantum Materials and Applications Research Center, National Institutes for Quantum Science and Technology（量子科学和技术研究院量子材料与应用程序研究中心）；Faculty of Pure and Applied Sciences, University of Tsukuba（筑波大学理工学部）
Towards Quantum Limited Spatial Resolution of NV-Diamond Magnetometry
Wyant College of Optical Sciences, University of Arizona（亚利桑那大学怀特光学学院）；Electrical and Computer Engineering, University of Maryland（马里兰大学电气与计算机工程系）；Department of Electrical Engineering, Indian Institute of Technology Bombay（印度孟买理工学院电气工程系）
Integration of diamond nanobeams with SnVs on Al2O3 waveguides for scalable quantum photonic chip application
Fujitsu Limited（富士通有限公司）；Research Center for Advanced Science and Technology, University of Tokyo（东京大学先进科学技术研究中心）；Delft University of Technology（代尔夫特理工大学）
