Andrej Denisenko

Revealing and reducing growth-induced interfacial disorder in preferentially aligned nitrogen-vacancy centers in diamond

Cheng-I Ho, Marina Davydova, Patrik Straňák, Felix Hoffmann et autres

Nitrogen-vacancy (NV) centers in chemical-vapor-deposition (CVD) diamond can form preferentially oriented ensembles with high sensing performance and low densities of lattice defects. Thin films of this material are a cornerstone of various imaging modalities. However, nitrogen injection needed to produce such films …

Readout of a solid state spin ensemble at the projection noise limit

Rouven Maier, Cheng-I Ho, Andrej Denisenko, Marina Davydova et autres

Abstract Spin ensembles are central to quantum science, from fundamental physics searches to magnetic resonance spectroscopy and quantum sensing. The standard quantum limit for their performance is ultimately posed by spin projection noise, yet solid-state implementations have so far been limited by …

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Discovery of ST2 centers in natural and CVD diamond

Jonas Foglszinger, Andrej Denisenko, G. V. Astakhov, Lev Kazak et autres

Abstract The ST2 center is an optically addressable point defect in diamond that facilitates spin initialization and readout at room temperature. However, while this study presents the discovery of photostable ST2 centers first observed in a natural diamond and provides a reliable …

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Unraveling quantum dephasing of nitrogen-vacancy center ensembles in diamond

Jixing Zhang, Cheuk Kit Cheung, Michael Kübler, Magnus Benke et autres

Abstract Nitrogen-vacancy (NV) center ensembles in diamond are one of the most promising solid-state quantum platforms for various sensing applications. Achieving ultimate sensitivity requires simultaneously long spin dephasing times ( $${T}_{2}^{* }$$ T 2 * ) and high NV center concentrations. In …

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Ramsey correlation spectroscopy with phase cycling using a single quantum sensor

Inbar Zohar, Santiago Oviedo-Casado, Andrej Denisenko, Rainer Stöhr et autres

Magnetic spectroscopy at the nanoscale provides unique insights into material properties and dynamics, with quantum sensors like nitrogen-vacancy (NV) centers being ideally suited for these scales. However, detecting low-frequency signals remains a challenge due to finite coherence times ($T_2^*$), as signals oscillating …

Sensing Single-Molecule Magnets with Nitrogen-Vacancy Centers

Ariel Smooha, Jitender Kumar, Dan Yudilevich, John W. Rosenberg et autres

Single-molecule magnets (SMMs) are molecules that can function as nanoscale magnets with potential use as magnetic memory bits. While SMMs can retain magnetization at low temperatures, characterizing them on surfaces and at room temperature remains challenging and requires specialized nanoscale techniques. Here, …

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Deformation-Driven Enhancement of Spin Defect Emission in Hexagonal Boron Nitride

Jianpei Geng, X. F. Zhou, Nils Gross, Song Li et autres

The negatively charged boron vacancy ( V B − ) in hexagonal boron nitride (hBN) has been extensively investigated, as it offers a playground for two-dimensional quantum sensing with the closest possible proximity to target samples. However, its practical sensitivity is limited …

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Experimental observation of liquid–solid transition of nanoconfined water at ambient temperature

Wentian Zheng, Shichen Zhang, Jian Ming Jiang, Rainer Stöhr et autres

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Witnessing nonstationary and non-Markovian environments with a quantum sensor

John W. Rosenberg, Martín Kuffer, Inbar Zohar, Rainer Stöhr et autres

Quantum sensors offer exceptional sensitivity to nanoscale magnetic fluctuations, where non-stationary effects -- such as spin diffusion -- and non-Markovian dynamics arising from coupling to few environmental degrees of freedom play critical roles. Because fully reconstructing the microscopic structure of realistic spin …

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Discovery of ST2 centers in natural and CVD diamond

Jonas Foglszinger, Andrej Denisenko, Georgy V. Astakhov, Lev Kazak et autres

The ST2 center is an optically addressable point defect in diamond that facilitates spin initialization and readout at room temperature. However, while this study presents the discovery of photostable ST2 centers first observed in a natural diamond and provides a reliable technique …

Unraveling quantum dephasing of nitrogen-vacancy center ensembles in diamond

Jixing Zhang, Cheuk Kit Cheung, Michael Kübler, Magnus Benke et autres

Nitrogen-vacancy (NV) center ensembles in diamond are one of the most promising solid-state quantum platforms for various sensing applications. Achieving ultimate sensitivity requires simultaneously long spin dephasing times ( T2*) and high NV center concentrations. In this work, we propose a systematic …

Data for: Ramsey correlation spectroscopy with phase cycling using a single quantum sensor

Inbar Zohar, Santiago Oviedo-Casado, Andrej Denisenko, Rainer Stoehr

Journal - Science Advances

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