419 citations · 2.8k across the 35 of their papers we have counts for
26 papers · 1 filter
20 Second Parity Lifetime in an InAs--Pb Tetron Device
Morteza Aghaee, Zulfi Alam, Mariusz Andrzejczuk +162
A central promise of topological quantum computing is that increasing the excitation gap improves device performance significantly. Here, we experimentally validate this principle…
Distinct Lifetimes for and Loop Measurements in a Majorana Tetron Device
Morteza Aghaee, Zulfi Alam, Rikke Andersen +164
We present a hardware realization and measurements of a tetron qubit device in a superconductor-semiconductor heterostructure. The device architecture contains two parallel superco…
Response to recent comments on Phys. Rev. B 107, 245423 (2023) and Subsection S4.3 of the Supp. Info. for Nature 638, 651-655 (2025)
Morteza Aghaee, Zulfi Alam, Mariusz Andrzejczuk +127
The topological gap protocol (TGP) is a statistical test designed to identify a topological phase with high confidence and without human bias. It is used to determine a promising p…
Interferometric Single-Shot Parity Measurement in an InAs-Al Hybrid Device
Morteza Aghaee, Alejandro Alcaraz Ramirez, Zulfi Alam +159
The fusion of non-Abelian anyons or topological defects is a fundamental operation in measurement-only topological quantum computation. In topological superconductors, this operati…
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…
InAs-Al Hybrid Devices Passing the Topological Gap Protocol
Morteza Aghaee, Arun Akkala, Zulfi Alam +124
We present measurements and simulations of semiconductor-superconductor heterostructure devices that are consistent with the observation of topological superconductivity and Majora…
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…
In-situ Tuning of the Electric Dipole Strength of a Double Dot Charge Qubit: Charge Noise Protection and Ultra Strong Coupling
P. Scarlino, J. H. Ungerer, D. J. van Woerkom +10
Semiconductor quantum dots, where electrons or holes are isolated via electrostatic potentials generated by surface gates, are promising building blocks for semiconductor-based qua…
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…
Roadmap for gallium arsenide spin qubits
Ferdinand Kuemmeth, Hendrik Bluhm
Gate-defined quantum dots in gallium arsenide (GaAs) have been used extensively for pioneering spin qubit devices due to the relative simplicity of fabrication and favourable elect…
Few-electron Single and Double Quantum Dots in an InAs Two-Dimensional Electron Gas
Christopher Mittag, Jonne V. Koski, Matija Karalic +8
Most proof-of-principle experiments for spin qubits have been performed using GaAs-based quantum dots because of the excellent control they offer over tunneling barriers and the or…
Realization of a Qubit: energy spectroscopy and coherence
Benedikt Kratochwil, Jonne V. Koski, Andreas J. Landig +9
The energy landscape of a single electron in a triple quantum dot can be tuned such that the energy separation between ground and excited states becomes a flat function of the rele…
Automated tuning of double quantum dots into specific charge states using neural networks
Renato Durrer, Benedikt Kratochwil, Jonne V. Koski +5
While quantum dots are at the forefront of quantum device technology, tuning multi-dot systems requires a lengthy experimental process as multiple parameters need to be accurately…
Strong photon coupling to the quadrupole moment of an electron in solid state
Jonne V. Koski, Andreas J. Landig, Maximilian Russ +11
The implementation of circuit quantum electrodynamics allows coupling distant qubits by microwave photons hosted in on-chip superconducting resonators. Typically, the qubit-photon…
Coherent long-distance spin-qubit-transmon coupling
A. J. Landig, J. V. Koski, P. Scarlino +10
Spin qubits and superconducting qubits are among the promising candidates for a solid state quantum computer. For the implementation of a hybrid architecture which can profit from…
Microwave cavity detected spin blockade in a few electron double quantum dot
A. J. Landig, J. V. Koski, P. Scarlino +5
We investigate spin states of few electrons in a double quantum dot by coupling them weakly to a magnetic field resilient NbTiN microwave resonator. We observe a reduced resonator…
Scanning Gate Microscopy in a Viscous Electron Fluid
Beat A Braem, Francesco M D Pellegrino, Alessandro Principi +10
We measure transport through a Ga[Al]As heterostructure at temperatures between 0.1 K and 30 K. Increasing the temperature enhances the electron-electron scattering rate and viscou…
Quantum thermodynamics in a single-electron box
Jonne V. Koski, Jukka P. Pekola
This chapter provides an overview of the methods and results for quantum thermodynamic experiments with single-electron devices. The experiments with a single-electron box on Jarzy…
Floquet spectroscopy of a strongly driven quantum dot charge qubit with a microwave resonator
J. V. Koski, A. J. Landig, A. Pályi +7
We experimentally investigate a strongly driven GaAs double quantum dot charge qubit weakly coupled to a superconducting microwave resonator. The Floquet states emerging from stron…
Coherent spin-qubit photon coupling
A. J. Landig, J. V. Koski, P. Scarlino +7
Electron spins hold great promise for quantum computation due to their long coherence times. An approach to realize interactions between distant spin-qubits is to use photons as ca…
Strong Coupling Cavity QED with Gate-Defined Double Quantum Dots Enabled by a High Impedance Resonator
Anna Stockklauser, Pasquale Scarlino, Jonne Koski +7
The strong coupling limit of cavity quantum electrodynamics (QED) implies the capability of a matter-like quantum system to coherently transform an individual excitation into a sin…
Distribution of current fluctuations in a bistable conductor
S. Singh, J. T. Peltonen, I. M. Khaymovich +3
We measure the full distribution of current fluctuations in a single-electron transistor with a controllable bistability. The conductance switches randomly between two levels due t…
On-chip Maxwell's demon as an information-powered refrigerator
J. V. Koski, A. Kutvonen, I. M. Khaymovich +2
We present an experimental realization of an autonomous Maxwell's Demon, which extracts microscopic information from a System and reduces its entropy by applying feedback. It is ba…
Experimental realization of a Coulomb blockade refrigerator
A. V. Feshchenko, J. V. Koski, J. P. Pekola
We present an experimental realization of a Coulomb blockade refrigerator (CBR) based on a single - electron transistor (SET). In the present structure, the SET island is interrupt…