Quantum Sensing Lab

Maletinsky Group

 
 
 

Welcome to the quantum sensing lab

Our laboratory is located in the Department of Physics of the University of Basel in Switzerland. Our research is centered around the emerging field of "Quantum sensing", where the use of individual, well-controlled quantum systems as high-performance sensing devices is being explored. We concentrate on implementing various types of such sensors and on applying them to outstanding scientific tasks in mesoscopic physics, nano-science and technology. At the moment, our quantum system of choice for these purposes is the Nitrogen-Vacancy (NV) color center in diamond, whose exceptional quantum-coherent properties allow for high-performance sensing applications (such as single-electron spin detection) even at room temperature.

 

News from the lab

Johannes' paper posted on Arxiv

The NV center in diamond offers a powerful platform for quantum information science and quantum metrology. But parasitic local intrinsic fields limit the effectiveness of sensing techniques operating at low external fields. Based on a theoretical model we characterize these intrinsic effective fields at the level of single NV centers using high-resolution spectroscopy in the absence of external fields. This allows us to extend the capabilities of NV-based sensing applications to low-field operation and strengthen the existing toolkit of quantum sensing techniques.

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Congratulations to Dr. Lucas Thiel

Lucas Thiel successfully defended his PhD thesis and has won the Swiss Nanotechnology Award 2019 sponsored by Bühler for his outstanding publication "Probing magnetism in 2D materials at the nanoscale with single spin microscopy".

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Lucas' paper published in Science

Lucas' paper entitled "Probing magnetism in 2D materials at the nanoscale with single spin microscopy" was published in Science. We demonstrate quantitative, nanoscale imaging of magnetisation, localised defects and magnetic domains in Cri3, a ferromagnetic 2D van der Waals crystals. We determine the magnetisation of a monolayer and establish that the inscrutable even-odd effect is intimately connected to the material structure.

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Congratulations to Märta Tschudin

We are delighted to announce that Märta Tschudin was awarded an QCQT Excellence Fellowship. The fellowship is aimed at outstanding PhD students from in- and outside Switzerland within the research area of quantum computing, quantum measurements, spintronics and quantum magnonics, quantum sensing, quantum optics and cold atoms, quantum transport and nanoelectronics, topological properties of condensed matter systems, and quantum communication.

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Johannes' paper published in PRL and elected Editors' Suggestion!

Shortcuts to adiabaticity are a recently developed protocols to speed up adiabatic state transfer. We exploit these techniques to prepare well-defined single spin dressed states, which exhibit efficient coherence protection. Besides a detailed study of the transfer process, we show direct coherent manipulation in the dressed state manifold. Thereby, our results offer attrative avenues for applications in quantum information processing and quantum sensing.

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Patrick Appel's paper published in Nano Letters!

Magnetoelectric antiferromagnets play an important role as a platform for spintronic applications including all electrical reading and writing of magnetic memories. In this paper we investigate the formation of domains in thin-film Cr2O3 using a combination of NV magnetometry and zero offset Hall magnetometry (ZOHM). We develop a model of the domain formation and extract important parameters, including the intergranular exchange coupling and critical temperature distribution.

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Welcome and Good Bye!

We welcome our new PhD Student Patrick Reiser, who will join the 4K magnetometry setup and say good bye to James Wood. We wish you all the best and good success for the future!

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Review on NVs as probe of superconductivity published in Journal of Superconductivity and Novel Magnetism

Magnetic imaging using color centers in diamond through both scanning and wide-field methods offers a combination of unique capabilities for studying superconductivity, for example, enabling accurate vector magnetometry at high temperature or high pressure, with spatial resolution down to the nanometer scale. The paper briefly reviews various experimental modalities in this rapidly developing nascent field and provides an outlook towards possible future directions.

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Goodbye Dr. Arne Barfuss and Dr. Daniel Riedel!

We say goodbye to our valued colleagues Arne Barfuss and Daniel Riedel after their successful time here in our group as PhD students and postdoctoral researchers.

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Arne made the cover!

Congratulations! Our closed-contour spin driving experiments made it to the cover of Nature Physic's November edition. The image shows quantum beats of a NV center due to quantum interference effects under closed-contour driving.

 

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