A5010044699- Quantum and electron transport phenomena
- Quantum Information and Cryptography
- Quantum Computing Algorithms and Architecture
- Neural Networks and Reservoir Computing
- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Advanced Electrical Measurement Techniques
- Advancements in Semiconductor Devices and Circuit Design
- Vibration and Dynamic Analysis
- Semiconductor materials and devices
- Quantum-Dot Cellular Automata
- Mechanical stress and fatigue analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Mechanics and Applications
- Cardiac electrophysiology and arrhythmias
- Analog and Mixed-Signal Circuit Design
- Mechanical and Optical Resonators
University of Copenhagen
2022
Microsoft (Denmark)
2022
IBM (United States)
2020-2022
The integration of semiconductor Josephson junctions (JJs) in superconducting quantum circuits provides a versatile platform for hybrid qubits and offers powerful way to probe exotic quasiparticle excitations. Recent proposals using circuit electrodynamics (cQED) detect topological superconductivity motivate the novel materials such circuits. Here, we report on realization transmon implemented with (Bi0.06Sb0.94)2Te3 insulator (TI) JJs ultrahigh vacuum fabrication techniques. Microwave...
We present a gate-voltage tunable transmon qubit (gatemon) based on planar InAs nanowires that are selectively grown high resistivity silicon substrate using III-V buffer layers. show low loss superconducting resonators with an internal quality of $2\times 10^5$ can readily be realized these substrates after the removal demonstrate coherent control and readout gatemon device relaxation time, $T_{1}\approx 700\,\mathrm{ns}$, dephasing times, $T_2^{\ast}\approx 20\,\mathrm{ns}$...
Flux-tunable qubits are a useful resource for superconducting quantum processors. They can be used to perform cPhase gates, facilitate fast reset protocols, avoid qubit-frequency collisions in large processors, and enable certain readout schemes. However, flux-tunable suffer from trade-off between their tunability range sensitivity flux noise. Optimizing this is particularly important enabling fast, high-fidelity, all-microwave cross-resonance gates large, high-coherence This mainly because...
Josephson parametric converters (JPCs) are superconducting devices capable of performing nondegenerate, three-wave mixing in the microwave domain without losses. One drawback limiting their use scalable quantum architectures is large footprint auxiliary circuit needed for operation, particular, off-chip, bulky, broadband hybrids and magnetic coils. Here, we realize a JPC that eliminates need these bulky components. The pump drive flux bias applied Hybrid-Less, Coil-Less (HLCL) device through...
We characterize two-qubit cross-resonance gates and unintended residual coupling on various coupled qubit arrangements. Direct versus via a quantum bus are studied the basis of gate rate fall-off non-nearest neighbor coupling. experimentally extract rates using Hamiltonian tomography methods, compare with microwave simulations.
Flux-tunable qubits are a useful resource for superconducting quantum processors. They can be used to perform cPhase gates, facilitate fast reset protocols, avoid qubit-frequency collisions in large processors, and enable certain readout schemes. However, flux-tunable suffer from trade-off between their tunability range sensitivity flux noise. Optimizing this is particularly important enabling fast, high-fidelity, all-microwave cross-resonance gates large, high-coherence This mainly because...