159 citations · 427 across the 12 of their papers we have counts for
12 papers
Modeling shallow confinement in tuneable quantum dots
Austris Akmentinsh, Niels Ubbelohde, Vyacheslavs Kashcheyevs
This paper proposes a universal microscopic model for the shallow confinement regime of single-electron tunneling devices. We consider particle escape from a quantum well generical…
Universal scaling of adiabatic tunneling out of a shallow confinement potential
Austris Akmentinsh, David Reifert, Thomas Weimann +3
The ability to tune quantum tunneling is key for achieving selectivity in manipulation of individual particles in quantum technology applications. In this work we count electron es…
Two electrons interacting at a mesoscopic beam splitter
Niels Ubbelohde, Lars Freise, Elina Pavlovska +8
The non-linear response of a beam splitter to the coincident arrival of interacting particles enables numerous applications in quantum engineering and metrology yet poses considera…
Magnetic field robust high quality factor NbTiN superconducting microwave resonators
Manuel Müller, Thomas Luschmann, Andreas Faltermeier +13
We systematically study the performance of compact lumped element planar microwave (NbTiN) resonators operating at 5 GHz in external in-plane magnetic fi…
A random-walk benchmark for single-electron circuits
David Reifert, Martins Kokainis, Andris Ambainis +2
Mesoscopic integrated circuits achieving high-fidelity control of elementary quantum systems require new methodology for benchmarking. We offer circuit-level statistical descriptio…
Trapping and counting ballistic non-equilibrium electrons
L. Freise, T. Gerster, D. Reifert +4
We demonstrate the trapping of electrons propagating ballistically at far-above-equilibrium energies in GaAs/AlGaAs heterostructures in high magnetic field. We find low-loss transp…
Partitioning of on-demand electron pairs
Niels Ubbelohde, Frank Hohls, Vyacheslavs Kashcheyevs +6
We demonstrate the high fidelity splitting of electron pairs emitted on demand from a dynamic quantum dot by an electronic beam splitter. The fidelity of pair splitting is inferred…
Spin-dependent shot noise enhancement in a quantum dot
Niels Ubbelohde, Christian Fricke, Frank Hohls +1
The spin-dependent dynamical blockade was investigated in a lateral quantum dot in a magnetic field. Spin-polarized edge channels in the two-dimensional leads and the spatial distr…
Strong quantum memory at resonant Fermi edges revealed by shot noise
N. Ubbelohde, K. Roszak, F. Hohls +3
Studies of non-equilibrium current fluctuations enable assessing correlations involved in quantum transport through nanoscale conductors. They provide additional information to the…
Electron spin orientation under in-plane optical excitation in GaAs quantum wells
S. Pfalz, R. Winkler, N. Ubbelohde +2
We study the optical orientation of electron spins in GaAs/AlGaAs quantum wells for excitation in the growth direction and for in-plane excitation. Time- and polarization-resolved…
Measurement of finite-frequency current statistics in a single-electron transistor
Niels Ubbelohde, Christian Fricke, Christian Flindt +2
Electron transport in nano-scale structures is strongly influenced by the Coulomb interaction which gives rise to correlations in the stream of charges and leaves clear fingerprint…
A quantized current source with mesoscopic feedback
Lukas Fricke, Frank Hohls, Niels Ubbelohde +7
We study a mesoscopic circuit of two quantized current sources, realized by non-adiabatic single- electron pumps connected in series with a small micron-sized island in between. We…