Gerwin Koolstra
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View article: Sensing and Control of Single Trapped Electrons above 1 K
Sensing and Control of Single Trapped Electrons above 1 K Open
Electrons trapped on the surface of cryogenic substrates (liquid helium, solid neon, or hydrogen) are an emerging platform for quantum information processing made attractive by the inherent purity of the electron environment, the scalabili…
View article: Strong coupling of a microwave photon to an electron on helium
Strong coupling of a microwave photon to an electron on helium Open
Electrons bound to the surface of superfluid helium have been proposed for scalable charge and spin-based quantum computing. However single electron quantum measurement in this system has remained elusive. Here we use a hybrid circuit quan…
View article: Kerr-cat Qubit Operations Below the Fault-tolerant Threshold
Kerr-cat Qubit Operations Below the Fault-tolerant Threshold Open
The ubiquitous noise in quantum system hinders the advancement of quantum information processing and has driven the emergence of different quantum error correction protocols. Among them, quantum error correction codes tailored for noise-bi…
View article: High-impedance resonators for strong coupling to an electron on helium
High-impedance resonators for strong coupling to an electron on helium Open
The in-plane motion of an electron on helium can couple to superconducting microwave resonators via electrical dipole coupling, offering a robust and rapid readout scheme. In previous efforts, microwave resonator designs for electrons on h…
View article: Implementation of scalable suspended superinductors
Implementation of scalable suspended superinductors Open
Superinductors have become a crucial component in the superconducting circuit toolbox, playing a key role in the development of more robust qubits. Enhancing the performance of these devices can be achieved by suspending the superinductors…
View article: Sensing and Control of Single Trapped Electrons Above 1 Kelvin
Sensing and Control of Single Trapped Electrons Above 1 Kelvin Open
Electrons trapped on the surface of cryogenic substrates (liquid helium, solid neon or hydrogen) are an emerging platform for quantum information processing made attractive by the inherent purity of the electron environment, the scalabilit…
View article: High-Coherence Kerr-Cat Qubit in 2D Architecture
High-Coherence Kerr-Cat Qubit in 2D Architecture Open
The Kerr-cat qubit is a bosonic qubit in which multiphoton Schrödinger cat states are stabilized by applying a two-photon drive to an oscillator with a Kerr nonlinearity. The suppressed bit-flip rate with increasing cat size makes this qub…
View article: Implementation of scalable suspended superinductors
Implementation of scalable suspended superinductors Open
Superinductors have become a crucial component in the superconducting circuit toolbox, playing a key role in the development of more robust qubits. Enhancing the performance of these devices can be achieved by suspending the superinductors…
View article: Quantum Benchmarking of High-Fidelity Noise-Biased Operations on a Detuned-Kerr-Cat Qubit
Quantum Benchmarking of High-Fidelity Noise-Biased Operations on a Detuned-Kerr-Cat Qubit Open
Ubiquitous noises in quantum systems remain a key obstacle to building quantum computers, necessitating the use of quantum error correction codes. Recently, error-correcting codes tailored for noise-biased systems have been shown to offer …
View article: High-Coherence Kerr-cat qubit in 2D architecture
High-Coherence Kerr-cat qubit in 2D architecture Open
The Kerr-cat qubit is a bosonic qubit in which multi-photon Schrodinger cat states are stabilized by applying a two-photon drive to an oscillator with a Kerr nonlinearity. The suppressed bit-flip rate with increasing cat size makes this qu…
View article: A hermetic on-cryostat helium source for low temperature experiments
A hermetic on-cryostat helium source for low temperature experiments Open
We describe a helium source cell for use in cryogenic experiments that is hermetically sealed in situ on the cold plate of a cryostat. The source cell is filled with helium gas at room temperature and, subsequently, sealed using a cold wel…
View article: Time-Dependent Hamiltonian Reconstruction Using Continuous Weak Measurements
Time-Dependent Hamiltonian Reconstruction Using Continuous Weak Measurements Open
Reconstructing the Hamiltonian of a quantum system is an essential task for characterizing and certifying quantum processors and simulators. Existing techniques either rely on projective measurements of the system before and after coherent…
View article: A Hermetic On-Cryostat Helium Source for Low Temperature Experiments
A Hermetic On-Cryostat Helium Source for Low Temperature Experiments Open
We describe a helium source cell for use in cryogenic experiments that is hermetically sealed $in$ $situ$ on the cold plate of a cryostat. The source cell is filled with helium gas at room temperature and subsequently sealed using a cold w…
View article: Time-Dependent Hamiltonian Reconstruction using Continuous Weak Measurements
Time-Dependent Hamiltonian Reconstruction using Continuous Weak Measurements Open
Reconstructing the Hamiltonian of a quantum system is an essential task for characterizing and certifying quantum processors and simulators. Existing techniques either rely on projective measurements of the system before and after coherent…
View article: Electron charge qubits with 0.1 millisecond coherence time
Electron charge qubits with 0.1 millisecond coherence time Open
Electron charge qubits are compelling candidates for solid-state quantum computing because of their inherent simplicity in qubit design, fabrication, control, and readout. However, all existing electron charge qubits, built upon convention…
View article: Blueprint for a High-Performance Fluxonium Quantum Processor
Blueprint for a High-Performance Fluxonium Quantum Processor Open
Transforming stand-alone qubits into a functional, general-purpose quantum processing unit requires an architecture where many-body quantum entanglement can be generated and controlled in a coherent, modular, and measurable fashion. Electr…
View article: Monitoring Fast Superconducting Qubit Dynamics Using a Neural Network
Monitoring Fast Superconducting Qubit Dynamics Using a Neural Network Open
Weak measurements of a superconducting qubit produce noisy voltage signals that are weakly correlated with the qubit state. To recover individual quantum trajectories from these noisy signals, traditional methods require slow qubit dynamic…
View article: Scalable High-Performance Fluxonium Quantum Processor
Scalable High-Performance Fluxonium Quantum Processor Open
The technological development of hardware heading toward universal fault-tolerant quantum computation requires a large-scale processing unit with high performance. While fluxonium qubits are promising with high coherence and large anharmon…
View article: Quantum-Tailored Machine-Learning Characterization of a Superconducting Qubit
Quantum-Tailored Machine-Learning Characterization of a Superconducting Qubit Open
Machine learning (ML) is a promising approach for performing challenging quantum-information tasks such as device characterization, calibration and control. ML models can train directly on the data produced by a quantum device while remain…
View article: Electron on solid neon -- a new solid-state single-electron qubit platform
Electron on solid neon -- a new solid-state single-electron qubit platform Open
The promise of quantum computing has driven a persistent quest for new qubit platforms with long coherence, fast operation, and large scalability. Electrons, ubiquitous elementary particles of nonzero charge, spin, and mass, have commonly …
View article: Trapping and manipulating single-electron qubits on solid neon in a hybrid circuit quantum electrodynamics architecture
Trapping and manipulating single-electron qubits on solid neon in a hybrid circuit quantum electrodynamics architecture Open
The promise of quantum computing has driven a persistent quest for new qubit platforms with long coherence, fast operation, and large scalability. Electrons, ubiquitous elementary particles of nonzero charge, spin, and mass, have commonly …
View article: Trapping a Single Electron on Superfluid Helium Using a Superconducting Resonator
Trapping a Single Electron on Superfluid Helium Using a Superconducting Resonator Open
Electrons on helium form a unique two-dimensional system on the interface of superfluid $^4$He and vacuum. At low temperatures and weak confinement, trapped electrons can arrange into strongly correlated states known as Wigner molecules, w…
View article: Atomic layer deposition of titanium nitride for quantum circuits
Atomic layer deposition of titanium nitride for quantum circuits Open
Superconducting thin films with high intrinsic kinetic inductance are of great importance for photon detectors, achieving strong coupling in hybrid systems, and protected qubits. We report on the performance of titanium nitride resonators,…
View article: Coherent Control of Spins with Gaussian Acoustics
Coherent Control of Spins with Gaussian Acoustics Open
Hybrid quantum systems combine the advantages of dissimilar quantum degrees of freedom to solve challenges of communicating between disparate quantum states. Silicon carbide (SiC) is an exemplary platform for hybrid spin-mechanical systems…
View article: Coupling an Ensemble of Electrons on Superfluid Helium to a Superconducting Circuit
Coupling an Ensemble of Electrons on Superfluid Helium to a Superconducting Circuit Open
The quantized lateral motional states and the spin states of electrons\ntrapped on the surface of superfluid helium have been proposed as basic\nbuilding blocks of a scalable quantum computer. Circuit quantum electrodynamics\n(cQED) allows…