A5039409463- Quantum Information and Cryptography
- Quantum and electron transport phenomena
- Quantum Computing Algorithms and Architecture
- Mechanical and Optical Resonators
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Mechanics and Applications
- Atomic and Subatomic Physics Research
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Electrical Measurement Techniques
- Particle Accelerators and Free-Electron Lasers
- Topological Materials and Phenomena
- Laser-Matter Interactions and Applications
- Magnetic Field Sensors Techniques
- Renal Diseases and Glomerulopathies
- Advanced MEMS and NEMS Technologies
- Quantum many-body systems
- Quantum-Dot Cellular Automata
- Quantum optics and atomic interactions
Karlsruhe Institute of Technology
2019-2024
Russian Quantum Center
2020-2021
National University of Science and Technology
2020-2021
Determining the state of a qubit on time scale much shorter than its relaxation is an essential requirement for quantum information processing. With aid nondegenerate parametric amplifier, we demonstrate continuous detection jumps transmon with $90\mathrm{%}$ fidelity discrimination. Entirely fabricated by standard two-step optical-lithography techniques, this type amplifier consists dispersion-engineered Josephson-junction (JJ) array. By using long arrays, containing...
Reading out the state of superconducting artificial atoms typically relies on dispersive coupling to a readout resonator. For given system noise temperature, increasing circulating photon number $\bar{n}$ in resonator enables shorter measurement time and is therefore expected reduce errors caused by spontaneous atom transitions. However, generally observed also increase these transition rates. Here we present fluxonium which measure an overall flat dependence rates between its first two...
We developed a versatile integrated control and readout instrument for experiments with superconducting quantum bits (qubits), based on field-programmable gate array (FPGA) platform. Using this platform, we perform measurement-based, closed-loop feedback operations $428 \, \mathrm{ns}$ platform latency. The capability is instrumental in realizing active reset initialization of the qubit into ground state time much shorter than its energy relaxation $T_1$. show experimental results...
Josephson junction parametric amplifiers have become essential tools for microwave quantum circuit readout with minimal added noise. Even after improving at an impressive rate in the past decade, they remain vulnerable to magnetic fields, which limits their use many applications such as spin qubits, Andreev and molecular magnet devices, dark matter searches, etc. Kinetic inductance materials, granular aluminum (grAl), offer alternative source of nonlinearity innate field resilience. We...
Fast discrimination between quantum states of superconducting artificial atoms is an important ingredient for information processing. In circuit electrodynamics, increasing the signal-field amplitude in readout resonator, dispersively coupled to atom, improves signal-to-noise ratio and increases measurement strength. Here, we employ this effect over 2 orders magnitude power, made possible by unique combination a dimer-Josephson-junction-array amplifier with large dynamic range fact that our...
Josephson junction parametric amplifiers have become essential tools for microwave quantum circuit readout with minimal added noise. Even after improving at an impressive rate in the last decade, they remain vulnerable to magnetic fields, which limits their use many applications such as spin qubits, Andreev and molecular magnet devices, dark matter searches, etc. Kinetic inductance materials, granular aluminum (grAl), offer alternative source of non-linearity innate resilience in-plane...
Quantum computing has tremendous potential to overcome some of the fundamental limitations present in classical information processing. Yet, today's technological quality and scaling prevent exploiting its full potential. based on superconducting quantum processing units (QPUs) is among most promising approaches towards practical advantage. In this article basic approach IQM Computers described covering both QPU rest full-stack computer. particular, focus a 20-qubit computer featuring Garnet...
The innate complexity of solid state physics exposes superconducting quantum circuits to interactions with uncontrolled degrees freedom degrading their coherence. By using a simple stabilization sequence we show that fluxonium qubit is coupled two-level system (TLS) environment unknown origin, relatively long energy relaxation time exceeding $50\,\text{ms}$. Implementing Szilard engine an active feedback control loop allows us decide whether the heats or cools its TLS environment. TLSs can...