A5047155755- Diamond and Carbon-based Materials Research
- Atomic and Subatomic Physics Research
- Quantum and electron transport phenomena
- High-pressure geophysics and materials
- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Catalytic Processes in Materials Science
- Force Microscopy Techniques and Applications
- Theoretical and Computational Physics
- Spectroscopy and Quantum Chemical Studies
- Magnetic properties of thin films
- Advanced Materials Characterization Techniques
- Advancements in Semiconductor Devices and Circuit Design
- Laser-Matter Interactions and Applications
- Graphene research and applications
- Quantum optics and atomic interactions
Center for Integrated Quantum Science and Technology
2022-2024
Universität Ulm
2018
The ability to process and store information on surrounding nuclear spins is a major requirement for group-IV color center-based repeater nodes. We demonstrate coherent control of ^{13}C spin strongly coupled negatively charged germanium-vacancy center in diamond with coherence times beyond 2.5 s at mK temperatures, which the longest reported defects. Detailed analysis allows us model system's dynamics, extract coupling parameters, characterize noise. estimate an achievable memory time 18.1...
We present a flexible scheme to realize non-Markovian dynamics of an electronic spin qubit, using nitrogen-vacancy center in diamond where the inherent nitrogen serves as regulator dynamics. By changing population spin, we show that can smoothly tune non-Markovianity electron spin's Furthermore, examine decoherence induced by bath exclude other sources non-Markovianity. The amount collected measurement data is kept at minimum employing Bayesian analysis. This allows for precise...
Over the years, an enormous effort has been made to establish nitrogen vacancy (N-$V$) centers in diamond as easily accessible and precise magnetic field sensors. However, most of their sensing protocols rely on application bias fields, preventing usage zero- or low-field experiments. We overcome this limitation by exploiting full spin $S=1$ nature N-$V$ center, allowing us detect nuclear signals at zero low with a linearly polarized microwave field. As conventional dynamical decoupling fail...
A recurring challenge in quantum science and technology is the precise control of their underlying dynamics that lead to desired operations, often described by a set gates. These gates can be subject application-specific errors, leading dependence controls on chosen circuit, quality measure gate-set itself. natural solution would apply optimal an application-oriented fashion. In turn, this requires definition meaningful contextual performance. Therefore, we explore compare applicability...
Diamond is a promising platform for quantum information processing as it can host highly coherent qubits that might allow the construction of large registers. A prerequisite such devices interaction between electron nitrogen vacancy (NV) spins. Entanglement dipolar-coupled NV spin pairs has been demonstrated, but with limited entanglement fidelity and its error sources have not characterized. Here, we design robust, easy to implement entangling gate spins in diamond quantify influence...
The ability to process and store information on surrounding nuclear spins is a major requirement for group-IV color center-based repeater nodes. We demonstrate coherent control of ${}^{13}$C spin strongly coupled negatively charged germanium-vacancy center in diamond with coherence times beyond 2.5s at mK temperatures, which the longest reported defects. Detailed analysis allows us model system's dynamics, extract coupling parameters, characterize noise. estimate an achievable memory time...
Over the years, an enormous effort has been made to establish nitrogen vacancy (NV) centers in diamond as easily accessible and precise magnetic field sensors. However, most of their sensing protocols rely on application bias fields, preventing usage zero- or low-field experiments. We overcome this limitation by exploiting full spin $S=1$ nature NV center, allowing us detect nuclear signals at with a linearly polarized microwave field. As conventional dynamical decoupling fail regime, we...
Quantum optimal control includes the family of pulse-shaping algorithms that aim to unlock full potential a variety quantum technologies. Our Optimal Control Suite (QuOCS) unites experimental focus and model-based approaches in unified framework. The easy usage installation QuOCS availability various combinable optimization strategies is designed improve performance many technology platforms, such as color defects diamond, superconducting qubits, atom- or ion-based computers. It can also be...