301 citations · 1.5k across the 25 of their papers we have counts for
25 papers
Two Anderson impurities coupled through a superconducting island: charge stability diagrams and double impurity qubit
Filip K. Malinowski
We present a model of two Anderson impurities coupled to and through a superconducting island. The model parametrizes the strength of the coupling between impurity sites, allowing…
Flux-Tunable Hybridization in a Double Quantum Dot Interferometer
Christian G. Prosko, Ivan Kulesh, Michael Chan +6
A single electron shared between two levels threaded by a magnetic flux is an irreducibly simple quantum system in which interference is predicted to occur. We demonstrate tuning o…
Quantum capacitance of a superconducting subgap state in an electrostatically floating dot-island
Filip K. Malinowski, R. K. Rupesh, Luka Pavešić +10
We study a hybrid device defined in an InAs nanowire with an epitaxial Al shell that consists of a quantum dot in contact with a superconducting island. The device is electrically…
Controllable Single Cooper Pair Splitting in Hybrid Quantum Dot Systems
Damaz de Jong, Christian G. Prosko, Lin Han +4
Cooper pair splitters hold utility as a platform for investigating the entanglement of electrons in Cooper pairs, but probing splitters with voltage-biased Ohmic contacts prevents…
Realization of a minimal Kitaev chain in coupled quantum dots
Tom Dvir, Guanzhong Wang, Nick van Loo +14
Majorana bound states constitute one of the simplest examples of emergent non-Abelian excitations in condensed matter physics. A toy model proposed by Kitaev shows that such states…
Variable and orbital-dependent spin-orbit field orientations in a InSb double quantum dot characterized via dispersive gate sensing
Lin Han, Michael Chan, Damaz de Jong +7
Utilizing dispersive gate sensing (DGS), we investigate the spin-orbit field () orientation in a many-electron double quantum dot (DQD) defined in an InSb nanowire…
Parametric exploration of zero-energy modes in three-terminal InSb-Al nanowire devices
Ji-Yin Wang, Nick van Loo, Grzegorz P. Mazur +10
We systematically study three-terminal InSb-Al nanowire devices by using radio-frequency reflectometry. Tunneling spectroscopy measurements on both ends of the hybrid nanowires are…
Radio-frequency C-V measurements with sub-attofarad sensitivity
Filip K. Malinowski, Lin Han, Damaz de Jong +9
We demonstrate the use of radio-frequency (rf) resonators to measure the capacitance of nano-scale semiconducting devices in field-effect transistor configurations. The rf resonato…
Rapid microwave-only characterization and readout of quantum dots using multiplexed gigahertz-frequency resonators
Damaz de Jong, Christian Prosko, Daan M. A. Waardenburg +6
Superconducting resonators enable fast characterization and readout of mesoscopic quantum devices. Finding ways to perform measurements of interest on such devices using resonators…
End-to-end correlated subgap states in hybrid nanowires
G. L. R. Anselmetti, E. A. Martinez, G. C. Ménard +9
End-to-end correlated bound states are investigated in superconductor-semiconductor hybrid nanowires at zero magnetic field. Peaks in subgap conductance are independently identifie…
Time-domain characterization and correction of on-chip distortion of control pulses in a quantum processor
M. A. Rol, L. Ciorciaro, F. K. Malinowski +7
We introduce Cryoscope, a method for sampling on-chip baseband pulses used to dynamically control qubit frequency in a quantum processor. We specifically use Cryoscope to measure t…
Conductance-matrix symmetries of a three-terminal hybrid device
G. C. Ménard, G. L. R. Anselmetti, E. A. Martinez +10
We present conductance-matrix measurements of a three-terminal superconductor-semiconductor hybrid device consisting of two normal leads and one superconducting lead. Using a symme…
A fast, low-leakage, high-fidelity two-qubit gate for a programmable superconducting quantum computer
M. A. Rol, F. Battistel, F. K. Malinowski +8
A common approach to realize conditional-phase (CZ) gates in transmon qubits relies on flux control of the qubit frequency to make computational states interact with non-computatio…
Suppressing quasiparticle poisoning with a voltage-controlled filter
Gerbold C. Ménard, Filip K. Malinowski, Denise Puglia +5
We study single-electron charging events in an Al/InAs nanowire hybrid system with deliberately introduced gapless regions. The occupancy of a Coulomb island is detected using a ne…
Radio-frequency methods for Majorana-based quantum devices: fast charge sensing and phase diagram mapping
Davydas Razmadze, Deividas Sabonis, Filip K. Malinowski +9
Radio-frequency (RF) reflectometry is implemented in hybrid semiconductor-superconductor nanowire systems designed to probe Majorana zero modes. Two approaches are presented. In th…
Fast spin exchange between two distant quantum dots
Filip K. Malinowski, Frederico Martins, Thomas B. Smith +8
The Heisenberg exchange interaction between neighboring quantum dots allows precise voltage control over spin dynamics, due to the ability to precisely control the overlap of orbit…
Spin of a multielectron quantum dot and its interaction with a neighboring electron
Filip K. Malinowski, Frederico Martins, Thomas B. Smith +8
We investigate the spin of a multielectron GaAs quantum dot in a sequence of nine charge occupancies, by exchange coupling the multielectron dot to a neighboring two-electron doubl…
Noise suppression and long-range exchange coupling for gallium arsenide spin qubits
Filip Kazimierz Malinowski
This thesis presents the results of the experimental study performed on spin qubits realized in gate-defined gallium arsenide quantum dots, with the focus on noise suppression and…
Negative spin exchange in a multielectron quantum dot
Frederico Martins, Filip K. Malinowski, Peter D. Nissen +5
By operating a one-electron quantum dot (fabricated between a multielectron dot and a one-electron reference dot) as a spectroscopic probe, we study the spin properties of a gate-c…
Symmetric Operation of the Resonant Exchange Qubit
Filip K. Malinowski, Frederico Martins, Peter D. Nissen +5
We operate a resonant exchange qubit in a highly symmetric triple-dot configuration using IQ-modulated RF pulses. At the resulting three-dimensional sweet spot the qubit splitting…
Spectrum of the Nuclear Environment for GaAs Spin Qubits
Filip K. Malinowski, Frederico Martins, Łukasz Cywiński +7
Using a singlet-triplet spin qubit as a sensitive spectrometer of the GaAs nuclear spin bath, we demonstrate that the spectrum of Overhauser noise agrees with a classical spin diff…
Notch filtering the nuclear environment of a spin qubit
F. K. Malinowski, F. Martins, P. D. Nissen +8
Electron spins in gate-defined quantum dots provide a promising platform for quantum computation. In particular, spin-based quantum computing in gallium arsenide takes advantage of…
Filter function formalism beyond pure dephasing and non-Markovian noise in singlet-triplet qubits
Edwin Barnes, Mark S. Rudner, Frederico Martins +3
The filter function formalism quantitatively describes the dephasing of a qubit by a bath that causes Gaussian fluctuations in the qubit energies with an arbitrary noise power spec…
Noise suppression using symmetric exchange gates in spin qubits
Frederico Martins, Filip K. Malinowski, Peter D. Nissen +6
We demonstrate a substantial improvement in the spin-exchange gate using symmetric control instead of conventional detuning in GaAs spin qubits, up to a factor-of-six increase in t…