Arno Bargerbos
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View article: Gate-tunable kinetic inductance parametric amplifier
Gate-tunable kinetic inductance parametric amplifier Open
Superconducting parametric amplifiers play a crucial role in the preparation and readout of quantum states at microwave frequencies, enabling high-fidelity measurements of superconducting qubits. Most existing implementations of these ampl…
View article: Tunneling of fluxons via a Josephson resonant level
Tunneling of fluxons via a Josephson resonant level Open
Fluxons in a superconducting loop can be coherently coupled by quantum phase slips occurring at a weak link such as a Josephson junction. If Cooper pair tunneling at the junction occurs through a resonant level, $2π$ quantum phase slips ar…
View article: Impurity Knight shift in quantum dot Josephson junctions
Impurity Knight shift in quantum dot Josephson junctions Open
Spectroscopy of a Josephson junction device with an embedded quantum dot reveals the presence of a contribution to level splitting in external magnetic field that is proportional to \cos\phi , where \phi is the gauge-invariant phase …
View article: Gate-tunable kinetic inductance parametric amplifier
Gate-tunable kinetic inductance parametric amplifier Open
Superconducting parametric amplifiers play a crucial role in the preparation and readout of quantum states at microwave frequencies, enabling high-fidelity measurements of superconducting qubits. Most existing implementations of these ampl…
View article: Strong tunable coupling between two distant superconducting spin qubits
Strong tunable coupling between two distant superconducting spin qubits Open
Superconducting (or Andreev) spin qubits have recently emerged as an alternative qubit platform with realizations in semiconductor-superconductor hybrid nanowires. In these qubits, the spin degree of freedom is intrinsically coupled to the…
View article: Data underlying "Electric field tunable superconductor-semiconductor coupling in Majorana nanowires"
Data underlying "Electric field tunable superconductor-semiconductor coupling in Majorana nanowires" Open
This repository contains an extended dataset of raw data underlying M. W A de Moor et al., Electric field tunable superconductor-semiconductor coupling in Majorana nanowires, New J. Phys. 20, 103049 (2018) It also contains python notebooks…
View article: Data underlying "Electric field tunable superconductor-semiconductor coupling in Majorana nanowires"
Data underlying "Electric field tunable superconductor-semiconductor coupling in Majorana nanowires" Open
This repository contains an extended dataset of raw data underlying M. W A de Moor et al., Electric field tunable superconductor-semiconductor coupling in Majorana nanowires, New J. Phys. 20, 103049 (2018) It also contains python notebooks…
View article: Gate-Tunable Kinetic Inductance in Proximitized Nanowires
Gate-Tunable Kinetic Inductance in Proximitized Nanowires Open
We report the detection of a gate-tunable kinetic inductance in a hybrid InAs/Al nanowire. For this purpose, we have embedded the nanowire into a quarter-wave coplanar waveguide resonator and measured the resonance frequency of the circuit…
View article: Microwave spectroscopy of interacting Andreev spins
Microwave spectroscopy of interacting Andreev spins Open
Andreev bound states are fermionic states localized in weak links between superconductors which can be occupied with spinful quasiparticles. Microwave experiments using superconducting circuits with InAs/Al nanowire Josephson junctions hav…
View article: Direct manipulation of a superconducting spin qubit strongly coupled to a transmon qubit
Direct manipulation of a superconducting spin qubit strongly coupled to a transmon qubit Open
Spin qubits in semiconductors are currently one of the most promising architectures for quantum computing. However, they face challenges in realizing multi-qubit interactions over extended distances. Superconducting spin qubits provide a p…
View article: Spectroscopy of spin-split Andreev levels in a quantum dot with superconducting leads
Spectroscopy of spin-split Andreev levels in a quantum dot with superconducting leads Open
We use a hybrid superconductor-semiconductor transmon device to perform spectroscopy of a quantum dot Josephson junction tuned to be in a spin-1/2 ground state with an unpaired quasiparticle. Due to spin-orbit coupling, we resolve two flux…
View article: Mitigation of quasiparticle loss in superconducting qubits by phonon scattering
Mitigation of quasiparticle loss in superconducting qubits by phonon scattering Open
Quantum error correction will be an essential ingredient in realizing fault-tolerant quantum computing. However, most correction schemes rely on the assumption that errors are sufficiently uncorrelated in space and time. In superconducting…
View article: Singlet-Doublet Transitions of a Quantum Dot Josephson Junction Detected in a Transmon Circuit
Singlet-Doublet Transitions of a Quantum Dot Josephson Junction Detected in a Transmon Circuit Open
We realize a hybrid superconductor-semiconductor transmon device in which the Josephson effect is controlled by a gate-defined quantum dot in an InAs/Al nanowire. Microwave spectroscopy of the transmon's transition spectrum allows us to pr…
View article: Quasiparticle trapping by orbital effect in a hybrid superconducting-semiconducting circuit
Quasiparticle trapping by orbital effect in a hybrid superconducting-semiconducting circuit Open
The tunneling of quasiparticles (QPs) across Josephson junctions (JJs) detrimentally affects the coherence of superconducting and charge-parity qubits, and is shown to occur more frequently in magnetic fields. Here we demonstrate the parit…
View article: Controlling the charge dispersion of a nearly-open superconducting island
Controlling the charge dispersion of a nearly-open superconducting island Open
Isolation from the environment determines the extent to which charge is confined on an island, which manifests as Coulomb oscillations such as charge dispersion. We investigate the charge dispersion of a nanowire transmon hosting a quantum…
View article: Gate-Tunable Field-Compatible Fluxonium
Gate-Tunable Field-Compatible Fluxonium Open
Circuit quantum electrodynamics, where photons are coherently coupled to\nartificial atoms built with superconducting circuits, has enabled the\ninvestigation and control of macroscopic quantum-mechanical phenomena in\nsuperconductors. Rec…
View article: Observation of Vanishing Charge Dispersion of a Nearly Open Superconducting Island
Observation of Vanishing Charge Dispersion of a Nearly Open Superconducting Island Open
Isolation from the environment determines the extent to which charge is confined on an island, which manifests as Coulomb oscillations, such as charge dispersion. We investigate the charge dispersion of a nanowire transmon hosting a quantu…
View article: A gate-tunable, field-compatible fluxonium
A gate-tunable, field-compatible fluxonium Open
Circuit quantum electrodynamics, where photons are coherently coupled to artificial atoms built with superconducting circuits, has enabled the investigation and control of macroscopic quantum-mechanical phenomena in superconductors. Recent…
View article: Electric field tunable superconductor-semiconductor coupling in Majorana nanowires
Electric field tunable superconductor-semiconductor coupling in Majorana nanowires Open
We study the effect of external electric fields on superconductor-semiconductor coupling by measuring the electron transport in InSb semiconductor nanowires coupled to an epitaxially grown Al superconductor. We find that the gate voltage i…
View article: Effects of gate-induced electric fields on semiconductor Majorana nanowires
Effects of gate-induced electric fields on semiconductor Majorana nanowires Open
We study the effect of gate-induced electric fields on the properties of semiconductor-superconductor hybrid nanowires which represent a promising platform for realizing topological superconductivity and Majorana zero modes. Using a self-c…