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Quantum Heterodyne Sensing of Nuclear Spins via Double Resonance
Jonas Meinel, Minsik Kwon, Durga Dasari +5
Nanoscale nuclear magnetic resonance (NMR) signals can be measured through hyperfine interaction to paramagnetic electron sensor spins. A heterodyne approach is widely used to over…
Quantum-assisted Distortion-free audio signal sensing
Chen Zhang, Durga Dasari, Matthias Widmann +9
Quantum sensors are keeping the cutting-edge sensitivities in metrology. However, for high-sensitive measurements of arbitrary signals, limitations in linear dynamic range could in…
Quantum nonlinear spectroscopy of single nuclear spins
Jonas Meinel, Vadim Vorobyov, Ping Wang +7
Nonlinear spectroscopy is widely used for studying physical systems. Conventional nonlinear optical spectroscopy and magnetic resonance spectroscopy, which use classical probes suc…
The Transition from Quantum to Classical in weak measurements and reconstruction of Quantum Correlation
Vadim Vorobyov, Jonas Meinel, Hitoshi Sumiya +4
The ability to follow the dynamics of a quantum system in a quantitative manner is of key importance for quantum technology. Despite its central role, justifiable deduction of the…
Integrated and portable magnetometer based on nitrogen-vacancy ensembles in diamond
Felix M. Stürner, Andreas Brenneis, Thomas Buck +13
Magnetic field sensors that exploit quantum effects have shown that they can outperform classical sensors in terms of sensitivity enabling a range of novel applications in future,…
Diamond magnetometry and gradiometry towards subpicotesla DC field measurement
Chen Zhang, Farida Shagieva, Matthias Widmann +11
Nitrogen vacancy (NV) centers in diamond have developed into a powerful solid-state platform for compact quantum sensors. However, high sensitivity measurements usually come with a…
Heterodyne Sensing of Microwaves with a Quantum Sensor
Jonas Meinel, Vadim Vorobyov, Boris Yavkin +5
Diamond quantum sensors are sensitive to weak microwave magnetic fields resonant to the spin transitions. However the spectral resolution in such protocols is limited ultimately by…
Quantum Metrology with Strongly Interacting Spin Systems
Hengyun Zhou, Joonhee Choi, Soonwon Choi +10
Quantum metrology makes use of coherent superpositions to detect weak signals. While in principle the sensitivity can be improved by increasing the density of sensing particles, in…
Probing quantum thermalization of a disordered dipolar spin ensemble with discrete time-crystalline order
Joonhee Choi, Hengyun Zhou, Soonwon Choi +8
We investigate thermalization dynamics of a driven dipolar many-body quantum system through the stability of discrete time crystalline order. Using periodic driving of electronic s…
High-resolution spectroscopy of single nuclear spins via sequential weak measurements
Matthias Pfender, Ping Wang, Hitoshi Sumiya +8
Quantum sensors have recently achieved to detect the magnetic moment of few or single nuclear spins and measure their magnetic resonance (NMR) signal. However, the spectral resolut…
Loop-gap Microwave Resonator for Hybrid Quantum Systems
Jason Ball, Yu Yamashiro, Hitoshi Sumiya +5
We designed a loop-gap microwave resonator for applications of spin-based hybrid quantum systems, and tested it with impurity spins in diamond. Strong coupling with ensembles of ni…
Protecting a diamond quantum memory by charge state control
Matthias Pfender, Nabeel Aslam, Patrick Simon +17
In recent years, solid-state spin systems have emerged as promising candidates for quantum information processing (QIP). Prominent examples are the Nitrogen-Vacancy (NV) center in…
Observation of discrete time-crystalline order in a disordered dipolar many-body system
Soonwon Choi, Joonhee Choi, Renate Landig +11
Understanding quantum dynamics away from equilibrium is an outstanding challenge in the modern physical sciences. It is well known that out-of-equilibrium systems can display a ric…
Nonvolatile quantum memory enables sensor unlimited nanoscale spectroscopy of finite quantum systems
Matthias Pfender, Nabeel Aslam, Hitoshi Sumiya +5
In nanoscale metrology applications, measurements are commonly limited by the performance of the sensor. Here we show that in nuclear magnetic resonance (NMR) spectroscopy measurem…
Depolarization dynamics in a strongly interacting solid-state spin ensemble
Joonhee Choi, Soonwon Choi, Georg Kucsko +9
We study the depolarization dynamics of a dense ensemble of dipolar interacting spins, associated with nitrogen-vacancy centers in diamond. We observe anomalously fast, density-dep…
Collective Strong Coupling with Homogeneous Rabi Frequencies using a 3D Lumped Element Microwave Resonator
Andreas Angerer, Thomas Astner, Daniel Wirtitsch +5
We design and implement 3D lumped element microwave cavities for the coherent and uniform coupling to electron spins hosted by nitrogen vacancy centers in diamond. Our design spati…
Optically induced dynamic nuclear spin polarisation in diamond
Jochen Scheuer, Ilai Schwartz, Qiong Chen +10
The sensitivity of Magnetic Resonance Imaging (MRI) depends strongly on nuclear spin polarisation and, motivated by this observation, dynamical nuclear spin polarisation has recent…
Towards a spin-ensemble quantum memory for superconducting qubits
C. Grezes, Y. Kubo, B. Julsgaard +15
This article reviews efforts to build a new type of quantum device, which combines an ensemble of electronic spins with long coherence times, and a small-scale superconducting quan…
Single Spin Optically Detected Magnetic Resonance with E-Band Microwave Resonators
Nabeel Aslam, Matthias Pfender, Rainer Stöhr +8
Magnetic resonance with ensembles of electron spins is nowadays performed in frequency ranges up to 240 GHz and in corresponding magnetic fields of up to 10 T. However, experiments…
Local and bulk 13C hyperpolarization in NV-centered diamonds at variable fields and orientations
Gonzalo A. Alvarez, Christian O. Bretschneider, Ran Fischer +6
Polarizing nuclear spins is of fundamental importance in biology, chemistry and physics. Methods for hyperpolarizing 13C nuclei from free electrons in bulk, usually demand operatio…
A subpicotesla diamond magnetometer
Thomas Wolf, Philipp Neumann, Kazuo Nakamura +3
Diamond defect centers are promising solid state magnetometers. Single centers allow for high spatial resolution field imaging but are limited in their magnetic field sensitivity t…
All-optical initialization, readout, and coherent preparation of single silicon-vacancy spins in diamond
Lachlan J. Rogers, Kay D. Jahnke, Mathias H. Metsch +8
The silicon-vacancy () color center in diamond has attracted attention due to its unique optical properties. It exhibits spectral stability and indistinguishability…
Indistinguishable photons from separated silicon-vacancy centers in diamond
Alp Sipahigil, Kay D. Jahnke, Lachlan J. Rogers +5
We demonstrate that silicon-vacancy (SiV) centers in diamond can be used to efficiently generate coherent optical photons with excellent spectral properties. We show that these fea…
Strongly Coupled Diamond Spin Qubits by Molecular Nitrogen Implantation
Takashi Yamamoto, Christoph Müller, Liam P. McGuinness +7
Ionized nitrogen molecules (N) are used as efficient point sources for creating NV pairs in diamond with nanoscale spatial separation and up to 55 kHz magnetic c…