A5056080420- Quantum and electron transport phenomena
- Magnetic properties of thin films
- Advancements in Semiconductor Devices and Circuit Design
- Surface and Thin Film Phenomena
- Semiconductor materials and devices
- Nonlinear Optical Materials Studies
- Semiconductor Quantum Structures and Devices
- Quantum Computing Algorithms and Architecture
- Hydraulic and Pneumatic Systems
- Micro and Nano Robotics
- Quantum Information and Cryptography
- Quantum-Dot Cellular Automata
- Quantum optics and atomic interactions
- Iterative Learning Control Systems
- Advanced Control Systems Optimization
- Pickering emulsions and particle stabilization
- Surface Roughness and Optical Measurements
- Electronic and Structural Properties of Oxides
- Nanofabrication and Lithography Techniques
- Crystallography and Radiation Phenomena
- Neuroscience and Neural Engineering
IBM Research - Zurich
2022-2025
ETH Zurich
2022-2023
Additive manufacturing at the micro- and nanoscale has seen a recent upsurge to suit an increasing demand for more elaborate structures. However, integration of multiple distinct materials small scales remains challenging. To this end, capillarity-assisted particle assembly (CAPA) two-photon polymerization direct laser writing (2PP-DLW) are combined realize new class multimaterial microstructures. 2PP-DLW CAPA both used fabricate 3D templates guide soft- hard colloids, link well-defined...
The inhomogeneous magnetic stray field of micromagnets has been extensively used to manipulate electron spin qubits. By means micromagnetic simulations and scanning superconducting quantum interference device microscopy, we show that the polycrystallinity magnet nonuniform magnetization significantly impact corresponding qubit properties. random orientation crystal axis in polycrystalline Co magnets alters frequencies by up 0.5 GHz, compromising single addressability gate fidelities. We map...
Abstract The rise of electron spin qubit architectures for quantum computing processors has led to a strong interest in designing and integrating ferromagnets induce stray magnetic fields dipole resonance (EDSR). integration nanomagnets imposes, however, strict layout processing constraints, challenging the arrangement different gating layers control neighboring frequencies. This work reports successful nano‐sized cobalt gates into multi‐gate fully‐depleted silicon‐on‐insulator (FDSOI)...
In semiconductor hole spin qubits, low magnetic field ($B$) operation extends the coherence time ($T_\mathrm{2}^*$) but proportionally reduces gate speed. contrast, singlet-triplet (ST) qubits are primarily controlled by exchange interaction ($J$) and can thus maintain high speeds even at $B$. However, a large $J$ introduces significant charge component to qubit, rendering ST more vulnerable noise when driven. Here, we demonstrate highly coherent qubit in germanium, operating both $B$ $J$....
On-chip micromagnets enable electrically controlled quantum gates on electron spin qubits. Extending the concept to a large number of qubits is challenging in terms providing enough driving gradients and individual addressability. Here, we present design aimed at arranged linear chain strongly confined directions lateral chain. Nanomagnets are placed laterally one side qubit chain, nanomagnet per two The magnets “U”-shaped, such that magnetic shape anisotropy orients magnetization...
In this work we propose and demonstrate the integration of ferromagnetic nanosized cobalt barrier gates in quantum dots arrays on ultra-thin fully-depleted Silicon-On-Insulator (SOI) nanowires. This innovative structure enhances both driving addressability, while minimizing decoherence fields for electron spin qubits. Charge noise spectra show sub-$1\cdot 10^{-6}\mathrm{e}^{2}$fflz values at 1 Hz, demonstrating a low impact from Cogates. Our double dot experimental data stable confinement 10...
The rise of electron spin qubit architectures for quantum computing processors has led to a strong interest in designing and integrating ferromagnets induce stray magnetic fields dipole resonance (EDSR). integration nanomagnets imposes however strict layout processing constraints, challenging the arrangement different gating layers control neighboring frequencies. This work reports successful nano-sized cobalt gates into multi-gate FD-SOI nanowire with nanometer-scale dot-to-magnet pitch,...
The inhomogeneous magnetic stray field of micromagnets has been extensively used to manipulate electron spin qubits. By means micromagnetic simulations and scanning superconducting quantum interference device microscopy, we show that the polycrystallinity magnet non-uniform magnetization significantly impact corresponding qubit properties. We find random orientation crystal axis in polycrystalline Co magnets alters frequencies by up 0.5 GHz, compromising single addressability gate...
Additive manufacturing at the micro- and nanoscale has seen a recent upsurge to suit increasing demand for more elaborate structures. However, integration precise placement of multiple distinct materials small scales remain challenge. To this end, we combine here directed capillary assembly colloidal particles two-photon direct laser writing (DLW) realize new class multi-material microstructures. We use DLW both fabricate 3D micro-templates guide soft- hard colloids, link well-defined...
We discuss a custom bulk FinFET platform for implementing fast and dense hole spin qubits. Using double quantum dot with two confined holes, single- two-qubit control is demonstrated by applying electrical microwave signals to one of the gate electrodes. From these experiments we estimate that both types operations can be realized times in few nanoseconds regime. In an outlook how further scale this technology towards 2D arrays.
On-chip micromagnets enable electrically controlled quantum gates on electron spin qubits. Extending the concept to a large number of qubits is challenging in terms providing enough driving gradients and individual addressability. Here we present design aimed at arranged linear chain strongly confined directions lateral chain. Nanomagnets are placed laterally one side qubit chain, nanomagnet per two The magnets "U"-shaped, such that magnetic shape anisotropy orients magnetization alternately...