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

Goodbye and Welcome!

Goodbye and thank you very much for a great PhD, Dr. Dominik Rohner. We wish you all the best.

We also welcome our new PhD student Beat Bürgler. Good luck!

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Goodbye and Welcome!

We say goodbye to our PostDoc Marcel.li Grimau, wish you all the best, and we welcome our new PhD student Josh Zuber.

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Congratulations to Dr. Johannes Kölbl

Johannes Kölbl successfully defended his PhD thesis with the title "Dressed states of a strain-driven spin in diamond" in the very first virtual defense within the group.

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Congratulations to Dr. Dominik Rohner

Dominik Rohner successfully defended his PhD thesis with the title "Towards Single Spin Magnetometry at mK Temperatures". Magnificent work!

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Daniel's paper published in Phys. Rev. Applied

We present high-resolution optically detected magnetic resonance (ODMR) spectroscopy on single nitrogen-vacancy (NV) center spins in diamond at and around zero magnetic field. The experimentally observed transitions depend sensitively on the interplay between the microwave (MW) probing field and the local intrinsic effective field comprising strain and electric fields, which act on the NV spin.

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Welcome to our new PostDoc David A Broadway

We welcome our new PostDoc David A Broadway, who will join the 4K magnetometry setup.

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Mara's paper published in Opt. Mater. Express

In our work we present a new approach combining top-down fabrication with bottom-up overgrowth to create diamond diamond nanopyramids, which form a very promising system for applications in nanoscale quantum sensing, with tip radii on the order of 10 nm and high collection efficiencies from color centers incorporated close to the pyramid apex.

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Congratulations to Dr. Mara Batzer

Mara Batzer successfully defended her PhD thesis. Well done!!!

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Johannes' paper published in New Journal of Physics

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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Dominik's paper published in APL

Out-of-plane-oriented NV centers in (111) diamond scanning probes bring significant benefits to magnetometry, ranging from improved magnetic field reconstruction capabilities to higher sensitivities. We fabricate and characterize (111) scanning probes and demonstrate their polarization independent fluorescence. Furthermore, we perform nanoscale NV magnetomety and show that the measured magnetic stray field is antisymmetric and not distorted as with (100) scanning probes.

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