Article
Physics, Applied
Cem Gueney Torun, Philipp-Immanuel Schneider, Martin Hammerschmidt, Sven Burger, Joseph H. D. Munns, Tim Schroeder
Summary: The study focuses on the fiber coupling performance of inverted nanocones for enhancing the light outcoupling of color centers in diamond. Optimized designs show high fiber coupling efficiency at specific wavelengths and promising results for broadband performance at room temperature. The analysis indicates that these nanostructures are robust against imperfections in fabrication.
APPLIED PHYSICS LETTERS
(2021)
Article
Multidisciplinary Sciences
Qi Zhang, Yuhang Guo, Wentao Ji, Mengqi Wang, Jun Yin, Fei Kong, Yiheng Lin, Chunming Yin, Fazhan Shi, Ya Wang, Jiangfeng Du
Summary: The nitrogen-vacancy (NV) center in diamond is crucial for achieving high-fidelity single-shot readout of qubits, with a new spin-to-charge conversion method introduced to suppress spin-flip errors. This technique shows potential for exceeding fault-tolerant thresholds and may have applications in integrated optoelectronic devices.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Tianqi Zhu, Jan Rhensius, Konstantin Herb, Viraj Damle, Gabriel Puebla-Hellmann, Christian L. Degen, Erika Janitz
Summary: The research team addressed the poor signal-to-noise ratio (SNR) issue of optical spin-readout techniques by coupling individual NV centers to optimized diamond nanopillars, leading to improved collection efficiency of fluorescence. The optimized devices showed increased SNR and were compatible with low-numerical-aperture collection optics and a reduced tip radius, reducing experimental overhead and improving spatial resolution for scanning applications.
Article
Chemistry, Multidisciplinary
Hossein T. Dinani, Enrique Munoz, Jeronimo R. Maze
Summary: This theoretical work proposes using the nitrogen-vacancy (NV) center in diamond as a nanosensor to detect electrochemical signals from an electrolyte solution, thus obtaining a concentration sensor. By measuring the inhomogeneous dephasing rate of the electron spin of the NV center, the concentration of ions can be estimated for a range of mean ionic concentrations in the solution.
Article
Chemistry, Multidisciplinary
Oliver Roman Opaluch, Nimba Oshnik, Richard Nelz, Elke Neu
Summary: The study introduces a planar, omega-shaped microwave antenna based on stripline for spin control of NV color centers in diamond. An optimal antenna design was found through finite integral simulations, and antennas were successfully fabricated on a glass substrate, creating highly uniform microwave fields.
Article
Optics
Muhib Omar, Andreas Conta, Andreas Westerhoff, Raphael Hasse, Georgios Chatzidrosos, Dmitry Budker, Arne Wickenbrock
Summary: We propose a design to enhance the collected fluorescence of nitrogen-vacancy color centers in diamond for quantum-sensing. Our experimental results demonstrate a 3.8-fold increase in collected fluorescence when comparing opposite emitting surfaces, which is consistent with ray-tracing simulation. This design improves the sensitivity in optical readout-based measurements of various physical quantities.
Article
Chemistry, Multidisciplinary
Umberto Celano, Hai Zhong, Florin Ciubotaru, Laurentiu Stoleriu, Alexander Stark, Peter Rickhaus, Felipe Favaro de Oliveira, Mathieu Munsch, Paola Favia, Maxim Korytov, Patricia Van Marcke, Patrick Maletinsky, Christoph Adelmann, Paul van der Heide
Summary: In this study, nonperturbative field distribution mapping in ultra-scaled magnetic nanowires with diameters down to 6 nm was achieved using scanning nitrogen-vacancy magnetometry, enabling localized, minimally invasive magnetic imaging with sensitivity down to 3 μT Hz(-1/2). The imaging revealed the presence of weak magnetic inhomogeneities inside in-plane magnetized nanowires, largely undetectable with standard metrology. The strong magnetic field confinement in the nanowires allowed for the study of the interaction between the stray magnetic field and the nitrogen-vacancy sensor, clarifying the formation mechanisms for technologically relevant magnetic nanostructures.
Review
Chemistry, Multidisciplinary
Tongtong Zhang, Goutam Pramanik, Kai Zhang, Michal Gulka, Lingzhi Wang, Jixiang Jing, Feng Xu, Zifu Li, Qiang Wei, Petr Cigler, Zhiqin Chu
Summary: The nitrogen-vacancy (NV) center is a promising quantum sensor for biomedical applications, with unique optical and spin properties that allow for quantitative measurement of nanoscale electromagnetic fields at room temperature. Its potential in molecular detection and imaging makes it one of the most versatile platforms for various life-science applications.
Article
Physics, Applied
P. Raecke, L. Pietzonka, J. Meijer, D. Spemann, R. Wunderlich
Summary: NV centers in diamond were engineered by introducing vacancies locally through argon ion implantation in type Ib diamond with subsequent annealing. The number of NV centers created from vacancies of a single implanted argon ion ranges from 0.04 to 0.79 depending on the ion energy. The diffusion of vacancies during annealing plays a significant role in NV yield behavior.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Aedan Gardill, Ishita Kemeny, Matthew C. Cambria, Yanfei Li, Hossein T. Dinani, Ariel Norambuena, Jeronimo R. Maze, Vincenzo Lordi, Shimon Kolkowitz
Summary: The control over charge states of color centers in solids is crucial for quantum technologies, but the microscopic charge dynamics of deep defects remain complex and unknown. By utilizing single-shot charge-state readout of an individual nitrogen-vacancy (NV) center, researchers were able to probe the charge dynamics of surrounding defects in diamond and demonstrate the charge conversion ability of optical illumination in capturing holes. This study sheds light on the importance of charge carrier generation, transport, and capture in quantum device design with color centers, offering a novel approach to probe and control charge dynamics in diamond.
Article
Chemistry, Physical
Xinghua Li, Faizan Raza, Yufeng Li, Jinnan Wang, Jinhao Wang, Hasnain Ali, Luyuan Wang, Yuan Zhao, Yanpeng Zhang
Summary: This article discusses the second- and third-order temporal interference of two non-degenerate pseudo-thermal sources in a nitrogen-vacancy center (NV-) and analyzes the relationship between the indistinguishability of source and path alternatives at low temperature. It demonstrates the switching between three-mode bunching and frequency beating effect controlled by the time offset and frequency difference to achieve an optical demultiplexer. Experimental results show that the advanced technique achieves a high channel spacing and speed, indicating potential applications in quantum computing and communication.
Article
Physics, Multidisciplinary
Jonas Gutsche, Ashkan Zand, Marek Bueltel, Artur Widera
Summary: Individual quantum emitters are fundamental building blocks for emerging quantum technologies, and collective effects might enhance performance even further. However, when using larger materials, the optical density of states is modified by the surrounding material, potentially masking the collective coupling in small domains due to transitions to bulk properties.
NEW JOURNAL OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Chu-Feng Liu, Weng-Hang Leong, Kangwei Xia, Xi Feng, Amit Finkler, Andrej Denisenko, Jorg Wrachtrup, Quan Li, Ren-Bao Liu
Summary: The article presents an improved design of a hybrid nanothermometer using NV centers and magnetic nanoparticles, demonstrating enhanced temperature sensitivity. This design enables detection of small temperature changes and offers a new tool for studying thermal processes in nanoscale systems.
NATIONAL SCIENCE REVIEW
(2021)
Article
Chemistry, Multidisciplinary
Xin Cao, Jingzhong Yang, Tom Fandrich, Yiteng Zhang, Eddy P. Rugeramigabo, Benedikt Brechtken, Rolf J. Haug, Michael Zopf, Fei Ding
Summary: Large-scale quantum networks require long-lived quantum memories as stationary nodes to interact with light qubits. Epitaxially grown quantum dots have potential for generating high purity, indistinguishable single and entangled photons. Coupling these emitters to memories with long coherence times enables the development of hybrid nanophotonic devices that incorporate the advantages of both systems.
Article
Nanoscience & Nanotechnology
Marie Krecmarova, Michal Gulka, Thijs Vandenryt, Jaroslav Hruby, Ladislav Fekete, Pavel Hubik, Andrew Taylor, Vincent Mortet, Ronald Thoelen, Emilie Bourgeois, Milos Nesladek
Summary: The label-free biosensor concept is based on manipulation of charge state of nitrogen-vacancy (NV) quantum color centers in diamond, combined with an electrochemical microfluidic flow cell sensor. The functionality of the device was demonstrated by optical detection of DNA molecules, using a strongly cationic charged polymer to shift the charge state of NV centers. The developed electrochemical device can also be applied to nuclear magnetic resonance spin sensing.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Tae-Yeon Hwang, Junghyun Lee, Seung-Woo Jeon, Yong-Su Kim, Young-Wook Cho, Hyang-Tag Lim, Sung Moon, Sang-Wook Han, Yong-Ho Choa, Hojoong Jung
Summary: In this work, sub-10 nm precision nitrogen vacancy (NV) color centers are successfully generated in diamond using nanoscale aperture arrays (NAAs) and a secondary E-beam hole pattern. Optical and spin measurements are performed on a cluster of NV spins, and the effect of NAAs during ion-implantation process is statistically investigated. The effectiveness of this technique for constructing a scalable system is discussed.
Article
Physics, Multidisciplinary
Seongjin Hong, Yong-Su Kim, Young-Wook Cho, Jaewan Kim, Seung-Woo Lee, Hyang-Tag Lim
Summary: This experiment explores quantum measurements on a photonic qutrit and observes that the information of a quantum state is split into three distinct parts - extracted information, disturbed information, and reversible information. These parts are in trade-off relations not only pairwise but also triplewise, with the triplewise relation being tighter. Optimal quantum measurements are also realized to preserve quantum information without loss, offering wider applications in measurement-based quantum information processing.
PHYSICAL REVIEW LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Stefania Castelletto, Alberto Peruzzo, Cristian Bonato, Brett C. Johnson, Marina Radulaski, Haiyan Ou, Florian Kaiser, Joerg Wrachtrup
Summary: In the past two decades, there have been significant advancements in the growth of silicon carbide (SiC) for electronic devices, particularly in high-power and high-frequency applications. Recent research has also uncovered unique optical properties of SiC that can be used for novel photonic devices. The combination of excellent electronic, photonic, and spintronic properties in SiC has prompted research in the development of devices and sensors in the quantum technology domain.
Article
Physics, Applied
Naoya Morioka, Di Liu, Oney O. Soykal, Izel Gediz, Charles Babin, Rainer Stoehr, Takeshi Ohshima, Nguyen Tien Son, Jawad Ul-Hassan, Florian Kaiser, Joerg Wrachtrup
Summary: This study provides a thorough investigation of the spin-optical dynamics of silicon vacancy centers in silicon carbide, including excited-state lifetimes, intersystem-crossing rates, and photoemission dynamics. The results deepen our understanding of the system and guide the implementation of scalable quantum applications based on silicon vacancy centers in silicon carbide.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Kangwei Xia, Fiammetta Sardi, Colin Sauerzapf, Thomas Kornher, Hans-Werner Becker, Zsolt Kis, Laszlo Kovacs, Denis Dertli, Jonas Foglszinger, Roman Kolesov, Joerg Wrachtrup
Summary: Electro-optical control is an essential tool for efficient integrated photonics, and lithium niobate on insulator (LNOI) is an emerging platform for on-chip photonics. Researchers have successfully incorporated rare-earth ion quantum emitters into electro-optical tunable lithium niobate thin films and demonstrated dynamic control over the frequency and Purcell enhancement of the microcavities. Single ions have been detected in the experiments.
Article
Quantum Science & Technology
Chang Hoon Park, Min Ki Woo, Byung Kwon Park, Yong-Su Kim, Hyeonjun Baek, Seung-Woo Lee, Hyang-Tag Lim, Seung-Woo Jeon, Hojoong Jung, Sangin Kim, Sang-Wook Han
Summary: Recent research has shown that while QKD networks using conventional protocols have been studied thoroughly, twin-field QKD (TF-QKD) has succeeded in long-distance QKD, but has only been verified for ring networks.
NPJ QUANTUM INFORMATION
(2022)
Article
Neurosciences
Chen Zhang, Jixing Zhang, Matthias Widmann, Magnus Benke, Michael Kuebler, Durga Dasari, Thomas Klotz, Leonardo Gizzi, Oliver Roehrle, Philipp Brenner, Joerg Wrachtrup
Summary: Magnetometers based on color centers in diamond exhibit excellent performance in sensitivity, bandwidth, dynamic range, and spatial resolution, making them widely applicable in various fields from biology and chemistry to industry. This study discusses the potential benefits of using these magnetometers for Magnetomyography (MMG) and Magnetoneurography (MNG) applications by analyzing sensitivity, dynamic range, and bandwidth, and comparing them to state-of-the-art techniques.
FRONTIERS IN NEUROSCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Jeffrey Neethi Neethirajan, Toni Hache, Domenico Paone, Dinesh Pinto, Andrej Denisenko, Rainer Stoehr, Peter Udvarhelyi, Anton Pershin, Adam Gali, Joerg Wrachtrup, Klaus Kern, Aparajita Singha
Summary: Near-surface negatively charged nitrogen vacancy (NV) centers show promise for magnetic imaging and quantum sensing, but their charge-state instabilities decrease fluorescence and NV coherence time, negatively affecting imaging sensitivity. In this study, we demonstrate that in situ adsorption of H2O on the diamond surface can partially recover the performance of shallow NV sensors. Controlled surface treatments are essential for implementing NV-based quantum sensing protocols under cryogenic ultrahigh vacuum conditions, as supported by band-bending calculations.
Article
Physics, Multidisciplinary
Yang Shen, Ping Wang, Chun Tung Cheung, Joerg Wrachtrup, Ren-Bao Liu, Sen Yang
Summary: Extracting useful signals is crucial for both classical and quantum technologies. Conventional noise filtering methods, limited in their application scope, rely on different patterns of signal and noise in frequency or time domains, while our proposed signal-nature-based approach leverages the intrinsic quantum nature of the system to single out quantum signals. We demonstrate the extraction of quantum correlation signals and the ability to separate the signal of a remote nuclear spin from overwhelming classical noise backgrounds, which is not achievable by conventional filter methods. Our work highlights the importance of quantum or classical nature as a new degree of freedom in quantum sensing and opens up new directions for quantum research.
PHYSICAL REVIEW LETTERS
(2023)
Correction
Physics, Multidisciplinary
Thomas Wolf, Philipp Neumann, Kazuo Nakamura, Hitoshi Sumiya, Takeshi Ohshima, Junichi Isoya, Joerg Wrachtrup
Article
Physics, Applied
Kin On Ho, Man Yin Leung, Wenyan Wang, Jianyu Xie, King Yau Yip, Jiahao Wu, Swee K. Goh, Andrej Denisenko, Joerg Wrachtrup, Sen Yang
Summary: High-pressure experiments play a crucial role in interdisciplinary research fields, but local probing techniques are limited due to the confinement of pressure chamber. The negatively charged nitrogen-vacancy (N-V) center has emerged as a versatile quantum sensor in pressurized environments. In this work, we compare the stress environments and performance of implanted N-V centers (IN-Vs) and N-V-enriched nanodiamonds (NDs) in a diamond anvil cell (DAC), revealing significant differences in stress tensors. We also propose methods to extend the working pressure of quantum sensing and explore more applications of the N-V center under pressure.
PHYSICAL REVIEW APPLIED
(2023)
Article
Optics
Vadim V. Vorobyov, Jonas Meinel, Hitoshi Sumiya, Shinobu Onoda, Junichi Isoya, Oleg Gulinsky, Joerg Wrachtrup
Summary: The ability to track and control the dynamics of a quantum system is crucial for quantum technology, but reconstructing the dynamics of a single quantum system from macroscopic data remains a challenging problem. In this study, we use weak measurements with an electron spin as a meter to track a single nuclear carbon spin in a diamond at room temperature. Through theoretical analysis and experiments, we establish the relationship between the statistical properties of the macroscopic readout signal of the electron spin and the quantum dynamics of the nucleus, and successfully reconstruct the quantum correlation using a measurement parameter. We validate our approach using the Leggett-Garg test.
Article
Optics
Junaid Ur Rehman, Seongjin Hong, Seung-Woo Lee, Yong-Su Kim, Young-Wook Cho, Hojoong Jung, Sung Moon, Hyundong Shin, Sang-Wook Han, Hyang-Tag Lim
Summary: Quantum multiple parameter estimation can achieve enhanced sensitivity beyond the classical limit. Experimental implementations to saturate the quantum Cramer-Rao bound typically require impractical entangled measurements, while the practical sensitivity is given by the Cramer-Rao bound relevant to the measurement probabilities.