157 citations · 572 across the 12 of their papers we have counts for
12 papers
High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits
Maria Spethmann, Stefano Bosco, Andrea Hofmann +2
Hybrid systems comprising superconducting and semiconducting materials are promising architectures for quantum computing. Superconductors induce long-range interactions between the…
Dynamics of hole singlet triplet qubits with large g-factor differences
Daniel Jirovec, Philipp M. Mutter, Andrea Hofmann +8
The spin-orbit interaction is the key element for electrically tunable spin qubits. Here we probe the effect of cubic Rashba spin-orbit interaction on mixing of the spin states by…
Local signatures of electron-electron scattering in an electronic cavity
Carolin Gold, Beat A. Bräm, Richard Steinacher +7
We image equilibrium and non-equilibrium transport through a two-dimensional electronic cavity using scanning gate microscopy (SGM). Injecting electrons into the cavity through a q…
Enhancement of Proximity Induced Superconductivity in a Planar Ge Hole Gas
Kushagra Aggarwal, Andrea Hofmann, Daniel Jirovec +9
Hole gases in planar germanium can have high mobilities in combination with strong spin-orbit interaction and electrically tunable g-factors, and are therefore emerging as a promis…
Imaging signatures of the local density of states in an electronic cavity
Carolin Gold, Beat A. Bräm, Michael S. Ferguson +9
We use Scanning Gate Microscopy to study electron transport through an open, gate-defined resonator in a Ga(Al)As heterostructure. Raster-scanning the voltage-biased metallic tip a…
A singlet triplet hole spin qubit in planar Ge
Daniel Jirovec, Andrea Hofmann, Andrea Ballabio +14
Spin qubits are considered to be among the most promising candidates for building a quantum processor. GroupIV hole spin qubits have moved into the focus of interest due to the eas…
Nontopological zero-bias peaks in full-shell nanowires induced by flux tunable Andreev states
Marco Valentini, Fernando Peñaranda, Andrea Hofmann +7
A semiconducting nanowire fully wrapped by a superconducting shell has been proposed as a platform for obtaining Majorana modes at small magnetic fields. In this study, we demonstr…
Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits
Andrea Hofmann, Daniel Jirovec, Maxim Borovkov +6
We study double quantum dots in a Ge/SiGe heterostructure and test their maturity towards singlet-triplet () qubits. We demonstrate a large range of tunability, from two sin…
Heat dissipation and fluctuations in a driven quantum dot
Andrea Hofmann, Ville F. Maisi, Julien Basset +5
While thermodynamics is a useful tool to describe the driving of large systems close to equilibrium, fluctuations dominate the distribution of heat and work in small systems and fa…
Measuring the degeneracy of discrete energy levels using a GaAs/AlGaAs quantum dot
Andrea Hofmann, Ville F. Maisi, Carolin Gold +8
We demonstrate an experimental method for measuring quantum state degeneracies in bound state energy spectra. The technique is based on the general principle of detailed balance, a…
Non-local polarization feedback in a fractional quantum Hall ferromagnet
Szymon Hennel, Beat A. Braem, Stephan Baer +11
In a quantum Hall ferromagnet, the spin polarization of the two-dimensional electron system can be dynamically transferred to nuclear spins in its vicinity through the hyperfine in…
Equilibrium free energy measurement of a confined electron driven out of equilibrium
Andrea Hofmann, Ville F. Maisi, Clemens Rössler +7
We study out-of equilibrium properties of a quantum dot in a GaAs/AlGaAs two-dimensional electron gas. By means of single electron counting experiments, we measure the distribution…