80 citations · 334 across the 26 of their papers we have counts for
24 papers · 1 filter
Buried germanium quantum well proximitised by magnetic field-resilient superconducting platinum iridium germanosilicide
Praveen Viswanathan, Erik Lemmens Sjöstrand, Davide Costa +8
Hybrid superconductor-semiconductor systems provide a versatile platform for quantum technologies, ranging from superconducting-spin interfaces to topological quantum devices. Prog…
A Degenerate Singlet-Triplet Qubit with All-Electrical Orthogonal Control
Phuong X. Nguyen, Konstantinos Tsoukalas, Jann H. Ungerer +8
Singlet-triplet qubits offer an attractive encoding for semiconductor quantum computing, combining ancilla-free readout, reduced sensitivity to common-mode noise, and baseband volt…
Large quantum dot energy level shifts in anomalous photon-assisted tunneling
Jared Benson, C. E. Sturner, A. R. Huffman +12
Orbital energy splittings are important quantum dot parameters for the operation of hole spin qubits. They are known to depend on the lateral confinement of the quantum dots. Howev…
Automated electrostatic characterization of quantum dot devices in single- and bilayer heterostructures
Merritt P. R. Losert, Dario Denora, Barnaby van Straaten +6
As quantum dot (QD)-based spin qubits advance toward larger, more complex device architectures, rapid, automated device characterization and data analysis tools become critical. Th…
Towards autonomous time-calibration of large quantum-dot devices: Detection, real-time feedback, and noise spectroscopy
Anantha S. Rao, Barnaby van Straaten, Valentin John +8
The performance and scalability of semiconductor quantum-dot (QD) qubits are limited by electrostatic drift and charge noise that shift operating points and destabilize qubit param…
A Three-Dimensional Array of Quantum Dots
Hanifa Tidjani, Dario Denora, Michael Chan +6
Quantum dots can confine single electrons or holes to define spin qubits that can be operated with high fidelity. Experimental work has progressed from linear to two-dimensional ar…
Conductance Plateaus at Quantum Hall Integer Filling Factors in Germanium Quantum Point Contacts
Karina Hudson, Davide Costa, Davide Degli Esposti +2
Constricting transport through a one-dimensional quantum point contact in the quantum Hall regime enables gate-tunable selection of the edge modes propagating between voltage probe…
Using Landau quantization to probe disorder in semiconductor heterostructures
Asser Elsayed, Davide Costa, Lucas E. A. Stehouwer +5
Understanding scattering mechanisms in semiconductor heterostructures is crucial to reducing sources of disorder and ensuring high yield and uniformity in large spin qubit arrays.…
Quantum oscillations in two-dimensional hole gases with competing cyclotron and Zeeman energy
Davide Costa, Lucas E. A. Stehouwer, Davide Degli Esposti +1
Evaluation of critical bandstructure and quantum transport parameters in two-dimensional systems is challenging when competition emerges among different energy scales shaping quant…
Buried unstrained germanium channels: a lattice-matched platform for quantum technology
Davide Costa, Patrick Del Vecchio, Karina Hudson +8
Strained Ge (-Ge) and strained Si (-Si) buried quantum wells have enabled advanced spin-qubit quantum processors. However, in the absence of suitable lattice-matched substrat…
Engineering Ge profiles in Si/SiGe heterostructures for increased valley splitting
Lucas E. A. Stehouwer, Merrit P. Losert, Maia Rigot +6
Electron spin qubits in Si/SiGe quantum wells are limited by the small and variable energy separation of the conduction band valleys. While sharp quantum well interfaces are pursue…
QARPET: A Crossbar Chip for Benchmarking Semiconductor Spin Qubits
Alberto Tosato, Asser Elsayed, Federico Poggiali +5
Large-scale integration of semiconductor spin qubits into quantum processors hinges on the ability to characterize quantum components at scale, a task challenged by their operation…
A two-dimensional 10-qubit array in germanium with robust and localised qubit control
Valentin John, Cécile X. Yu, Barnaby van Straaten +10
Quantum computers require the systematic operation of qubits with high fidelity. For holes in germanium, the spin-orbit interaction allows for \textit{in situ} electric fast and hi…
Reducing disorder in Ge quantum wells by using thick SiGe barriers
Davide Costa, Lucas E. A. Stehouwer, Yi Huang +4
We investigate the disorder properties of two-dimensional hole gases in Ge/SiGe heterostructures grown on Ge wafers, using thick SiGe barriers to mitigate the influence of the semi…
Modular Autonomous Virtualization System for Two-Dimensional Semiconductor Quantum Dot Arrays
Anantha S. Rao, Donovan Buterakos, Barnaby van Straaten +8
Arrays of gate-defined semiconductor quantum dots are among the leading candidates for building scalable quantum processors. High-fidelity initialization, control, and readout of s…
Exploiting epitaxial strained germanium for scaling low noise spin qubits at the micron-scale
Lucas E. A. Stehouwer, Cécile X. Yu, Barnaby van Straaten +10
Disorder in the heterogeneous material stack of semiconductor spin qubit systems introduces noise that compromises quantum information processing, posing a challenge to coherently…
A quantum dot in germanium proximitized by a superconductor
Lazar Lakic, William I. L. Lawrie, David van Driel +6
Planar germanium quantum wells have recently been shown to host hard-gapped superconductivity. Additionally, quantum dot spin qubits in germanium are well-suited for quantum inform…
Operating semiconductor quantum processors with hopping spins
Chien-An Wang, Valentin John, Hanifa Tidjani +16
Qubits that can be efficiently controlled are essential for the development of scalable quantum hardware. While resonant control is used to execute high-fidelity quantum gates, the…
Gate modulation of the hole singlet-triplet qubit frequency in germanium
John Rooney, Zhentao Luo, Lucas E. A. Stehouwer +3
Spin qubits in germanium gate-defined quantum dots have made considerable progress within the last few years, partially due to their strong spin-orbit coupling and site-dependent $…
Low disorder and high valley splitting in silicon
Davide Degli Esposti, Lucas E. A. Stehouwer, Önder Gül +13
The electrical characterisation of classical and quantum devices is a critical step in the development cycle of heterogeneous material stacks for semiconductor spin qubits. In the…
A vertical gate-defined double quantum dot in a strained germanium double quantum well
Hanifa Tidjani, Alberto Tosato, Alexander Ivlev +6
Gate-defined quantum dots in silicon-germanium heterostructures have become a compelling platform for quantum computation and simulation. Thus far, developments have been limited t…
Germanium wafers for strained quantum wells with low disorder
Lucas E. A. Stehouwer, Alberto Tosato, Davide Degli Esposti +4
We grow strained Ge/SiGe heterostructures by reduced-pressure chemical vapor deposition on 100 mm Ge wafers. The use of Ge wafers as substrates for epitaxy enables high-quality Ge-…
Atomic fluctuations lifting the energy degeneracy in Si/SiGe quantum dots
Brian Paquelet Wuetz, Merritt P. Losert, Sebastian Koelling +16
Electron spins in Si/SiGe quantum wells suffer from nearly degenerate conduction band valleys, which compete with the spin degree of freedom in the formation of qubits. Despite att…
Effect of quantum Hall edge strips on valley splitting in silicon quantum wells
Brian Paquelet Wuetz, Merritt P. Losert, Alberto Tosato +10
We determine the energy splitting of the conduction-band valleys in two-dimensional electrons confined to low-disorder Si quantum wells. We probe the valley splitting dependence on…