282 citations · 1k across the 16 of their papers we have counts for
16 papers
Fast two-qubit logic with holes in germanium
N. W. Hendrickx, D. P. Franke, A. Sammak +2
The promise of quantum computation with quantum dots has stimulated widespread research. Still, a platform that can combine excellent control with fast and high-fidelity operation…
Ballistic supercurrent discretization and micrometer-long Josephson coupling in germanium
N. W. Hendrickx, M. L. V. Tagliaferri, M. Kouwenhoven +6
We fabricate Josephson field-effect-transistors in germanium quantum wells contacted by superconducting aluminum and demonstrate supercurrents carried by holes that extend over jun…
Rent's rule and extensibility in quantum computing
David P. Franke, James S. Clarke, Lieven M. K. Vandersypen +1
Quantum computing is on the verge of a transition from fundamental research to practical applications. Yet, to make the step to large-scale quantum computation, an extensible qubit…
Spin lifetime and charge noise in hot silicon quantum dot qubits
L. Petit, J. M. Boter, H. G. J. Eenink +10
We investigate the magnetic field and temperature dependence of the single-electron spin lifetime in silicon quantum dots and find a lifetime of 2.8 ms at a temperature of 1.1 K. W…
Gate-controlled quantum dots and superconductivity in planar germanium
N. W. Hendrickx, D. P. Franke, A. Sammak +9
Superconductors and semiconductors are crucial platforms in the field of quantum computing. They can be combined to hybrids, bringing together physical properties that enable the d…
A Crossbar Network for Silicon Quantum Dot Qubits
R. Li, L. Petit, D. P. Franke +10
The spin states of single electrons in gate-defined quantum dots satisfy crucial requirements for a practical quantum computer. These include extremely long coherence times, high-f…
Multiple-quantum transitions and charge-induced decoherence of donor nuclear spins in silicon
David P. Franke, Moritz P. D. Pflüger, Kohei M. Itoh +1
We study single- and multi-quantum transitions of the nuclear spins of ionized arsenic donors in silicon and find quadrupolar effects on the coherence times, which we link to fluct…
Electron nuclear double resonance with donor-bound excitons in silicon
David P. Franke, Michael Szech, Florian M. Hrubesch +7
We present Auger-electron-detected magnetic resonance (AEDMR) experiments on phosphorus donors in silicon, where the selective optical generation of donor-bound excitons is used fo…
Quadrupolar Effects on Nuclear Spins of Neutral Arsenic Donors in Silicon
David P. Franke, Moritz P. D. Pflüger, Pierre-André Mortemousque +2
We present electrically detected electron nuclear double resonance measurements of the nuclear spins of ionized and neutral arsenic donors in strained silicon. In addition to a red…
High cooperativity coupling between a phosphorus donor spin ensemble and a superconducting microwave resonator
Christoph W. Zollitsch, Kai Mueller, David P. Franke +4
We investigate the coupling of an ensemble of phosphorus donors in an isotopically purified Si host lattice interacting with a superconducting coplanar waveguide resonator.…
Quadrupole Shift of Nuclear Magnetic Resonance of Donors in Silicon at Low Magnetic Field
P. A. Mortemousque, S. Rosenius, G. Pica +8
Shifts from the expected nuclear magnetic resonance frequencies of antimony and bismuth donors in silicon of greater than a megahertz are observed in electrically detected magnetic…
Interaction of Strain and Nuclear Spins in Silicon: Quadrupolar Effects on Ionized Donors
David P. Franke, Florian M. Hrubesch, Markus Künzl +5
The nuclear spins of ionized donors in silicon have become an interesting quantum resource due to their very long coherence times. Their perfect isolation, however, comes at a pric…
Spin-dependent recombination at arsenic donors in ion-implanted silicon
David P. Franke, Manabu Ostuka, Takashi Matsuoka +4
Spin-dependent transport processes in thin near-surface doping regions created by low energy ion implantation of arsenic in silicon are detected by two methods, spin-dependent reco…
Spin-dependent recombination involving oxygen-vacancy complexes in silicon
David P. Franke, Felix Hoehne, Leonid S. Vlasenko +2
Spin-dependent relaxation and recombination processes in -irradiated -type Czochralski-grown silicon are studied using continuous wave (cw) and pulsed electrically detected m…
Spin Selection Rule-Based Sub-Millisecond Hyperpolarization of Nuclear Spins in Silicon
Felix Hoehne, Lukas Dreher, David P. Franke +4
In this work, we devise a fast and effective nuclear spin hyperpolarization scheme, which is in principle magnetic field and temperature independent. We use this scheme to experime…
Time Constants of Spin-Dependent Recombination Processes
Felix Hoehne, Lukas Dreher, Maximilian Suckert +3
We present experiments to systematically study the time constants of spin-dependent recombination processes in semiconductors using pulsed electrically detected magnetic resonance…