87 citations · 292 across the 8 of their papers we have counts for
7 papers · 1 filter
Coherent control and spectroscopy of a semiconductor quantum dot Wigner molecule
J. Corrigan, J. P. Dodson, H. Ekmel Ercan +12
Multi-electron semiconductor quantum dots have found wide application in qubits, where they enable readout and enhance polarizability. However, coherent control in such dots has ty…
Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit
J. C. Abadillo-Uriel, Brandur Thorgrimsson, Dohun Kim +11
We report anomalous behavior in the energy dispersion of a three-electron double-quantum-dot hybrid qubit and argue that it is caused by atomic-scale disorder at the quantum-well i…
The critical role of substrate disorder in valley splitting in Si quantum wells
Samuel F. Neyens, Ryan H. Foote, Brandur Thorgrimsson +11
Motivated by theoretical predictions that spatially complex concentration modulations of Si and Ge can increase the valley splitting in quantum wells, we grow and characterize Si/S…
Extending the coherence of a quantum dot hybrid qubit
Brandur Thorgrimsson, Dohun Kim, Yuan-Chi Yang +10
Identifying and ameliorating dominant sources of decoherence are important steps in understanding and improving quantum systems. Here we show that the free induction decay time ($T…
State-conditional coherent charge qubit oscillations in a Si/SiGe quadruple quantum dot
D. R. Ward, Dohun Kim, D. E. Savage +5
Universal quantum computation requires high fidelity single qubit rotations and controlled two qubit gates. Along with high fidelity single qubit gates, strong efforts have been ma…
Characterization of a gate-defined double quantum dot in a Si/SiGe nanomembrane
T. J. Knapp, R. T. Mohr, Yize Stephanie Li +9
We report the fabrication and characterization of a gate-defined double quantum dot formed in a Si/SiGe nanomembrane. In the past, all gate-defined quantum dots in Si/SiGe heterost…
Transport through an impurity tunnel coupled to a Si/SiGe quantum dot
Ryan H. Foote, Daniel R. Ward, J. R. Prance +8
Achieving controllable coupling of dopants in silicon is crucial for operating donor-based qubit devices, but it is difficult because of the small size of donor-bound electron wave…