827 citations · 5.2k across the 96 of their papers we have counts for
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Assessing Majorana states and qubits through quantum capacitance
Rodrigo A. Dourado, Ramón Aguado, Jeroen Danon +2
Quantum capacitance (QC) has recently emerged as a promising tool for parity readout in topological qubits based on Majorana bound states (MBSs). Here, we show that this capability…
Machine-learned tuning to protected states by probing noise resilience
Rodrigo A. Dourado, Nicolás Martínez-Valero, Jacob Benestad +3
Protected states are promising for quantum technologies due to their intrinsic resilience against noise. However, such states often emerge at discrete points or small regions in pa…
Quantifying robustness and locality of Majorana bound states in interacting systems
William Samuelson, Juan Daniel Torres Luna, Sebastian Miles +4
Protecting qubits from perturbations is a central challenge in quantum computing. Topological superconductors with separated Majorana bound states (MBSs) provide a strong form of p…
Spin-photon coupling using circular double quantum dots
Ferdinand Omlor, Florinda Viñas Boström, Martin Leijnse
We propose and analyze a microwave spin-photon interface based on a circular double quantum dot, inspired by recent experimental observations of anisotropic g-factors and ring stat…
Measuring coherence factors of states in superconductors through local current
Rodrigo A. Dourado, Jeroen Danon, Martin Leijnse +1
The coherence factors of quasiparticles in a superconductor determine their properties, including transport and susceptibility to electric fields. In this work, we propose a way to…
Adiabatic nonabelian braiding of imperfect Majoranas
Maximilian Nitsch, Viktor Svensson, William Samuelson +5
Demonstration of a nontrivial result of quasiparticle exchange (or braiding) is usually considered the definitive proof of a topological phase with nonabelian excitations, such as…
Majorana sweet spots in 3-site Kitaev chains
Rodrigo A. Dourado, Martin Leijnse, Rubén Seoane Souto
Minimal Kitaev chains, composed of two quantum dots (QDs) connected via a superconductor, have emerged as an attractive platform to realize Majorana bound states (MBSs). These exci…
Current noise in quantum dot thermoelectric engines
Simon Wozny, Martin Leijnse
We theoretically investigate a thermoelectric heat engine based on a single-level quantum dot, calculating average quantities such as current, heat current, output power, and effic…
The poor man's Majorana tetron
Maximilian Nitsch, Lorenzo Maffi, Virgil V. Baran +4
The Majorana tetron is a prototypical topological qubit stemming from the ground state degeneracy of a superconducting island hosting four Majorana modes. This degeneracy manifests…
Majorana modes in quantum dots coupled via a floating superconducting island
R. Seoane Souto, V. V. Baran, M. Nitsch +4
Majorana modes can be engineered in arrays where quantum dots (QDs) are coupled via grounded superconductors, effectively realizing an artificial Kitaev chain. Minimal Kitaev chain…
Quantum-dot-based Kitaev chains: Majorana quality measures and scaling with increasing chain length
Viktor Svensson, Martin Leijnse
Realizing Majorana bound states (MBSs) in short, well-controllable chains of coupled quantum dots sidesteps the problem of disorder, but requires fine-tuning and does not give the…
Thermoelectric cooling of a finite reservoir coupled to a quantum dot
Stephanie Matern, Saulo V. Moreira, Peter Samuelsson +1
We investigate non-equilibrium transport of charge and heat through an interacting quantum dot coupled to a finite electron reservoir. Both the quantum dot and the finite reservoir…
Subgap transport in superconductor--semiconductor hybrid islands: Weak and strong coupling regimes
Marco Valentini, Rubén Seoane Souto, Maksim Borovkov +5
Superconductor--semiconductor hybrid systems play a crucial role in realizing nanoscale quantum devices, including hybrid qubits, Majorana bound states, and Kitaev chains. For such…
RealTimeTransport: An open-source C++ library for quantum transport simulations in the strong coupling regime
Konstantin Nestmann, Martin Leijnse, Maarten R. Wegewijs
The description of quantum transport in the strong system-reservoir coupling regime poses a significant theoretical and computational challenge that demands specialized tools for a…
Topological superconductivity in Fibonacci quasicrystals
Aksel Kobiałka, Oladunjoye A. Awoga, Martin Leijnse +3
We investigate the properties of a Fibonacci quasicrystal (QC) arrangement of a one-dimensional topological superconductor, such as a magnetic atom chain deposited on a superconduc…
Machine-learned tuning of artificial Kitaev chains from tunneling-spectroscopy measurements
Jacob Benestad, Athanasios Tsintzis, Rubén Seoane Souto +3
We demonstrate reliable machine-learned tuning of quantum-dot-based artificial Kitaev chains to Majorana sweet spots, using the covariance matrix adaptation algorithm. We show that…
Josephson junction π-0 transition induced by orbital hybridization in a double quantum dot
Rousan Debbarma, Athanasios Tsintzis, Markus Aspegren +5
In this work, we manipulate the phase shift of a Josephson junction using a parallel double quantum dot (QD). By employing a superconducting quantum interference device, we determi…
Minimal quantum dot based Kitaev chain with only local superconducting proximity effect
William Samuelson, Viktor Svensson, Martin Leijnse
The possibility to engineer a Kitaev chain in quantum dots coupled via superconductors has recently emerged as a promising path toward topological superconductivity and possibly no…
Transport-based fusion that distinguishes between Majorana and Andreev bound states
Maximilian Nitsch, Rubén Seoane Souto, Stephanie Matern +1
It has proven difficult to distinguish between topological Majorana bound states and nontopological Andreev bound states and to measure the unique properties of the former. In this…
Probing Majorana localization in minimal Kitaev chains through a quantum dot
Rubén Seoane Souto, Athanasios Tsintzis, Martin Leijnse +1
Artificial Kitaev chains, formed by quantum dots coupled via superconductors, have emerged as a promising platform for realizing Majorana bound states. Even a minimal Kitaev chain…
Supercurrent transport through 1-periodic full-shell Coulomb islands
D. Razmadze, R. Seoane Souto, E. C. T. O'Farrell +4
We experimentally investigate supercurrent through Coulomb islands, where island and leads are fabricated from semiconducting nanowires with fully surrounding superconducting shell…
Controlling Majorana hybridization in magnetic chain-superconductor systems
Oladunjoye A. Awoga, Ioannis Ioannidis, Archana Mishra +3
We propose controlling the hybridization between Majorana zero modes at the ends of magnetic adatom chains on superconductors by an additional magnetic adatom deposited close by. B…
Fermion-parity qubit in a proximitized double quantum dot
Max Geier, Rubén Seoane Souto, Jens Schulenborg +3
Bound states in quantum dots coupled to superconductors can be in a coherent superposition of states with different electron number but with the same fermion parity. Electrostatic…
Roadmap towards Majorana qubits and nonabelian physics in quantum dot-based minimal Kitaev chains
Athanasios Tsintzis, Rubén Seoane Souto, Karsten Flensberg +2
The possibility to engineer artificial Kitaev chains in arrays of quantum dots coupled via narrow superconducting regions has emerged as an attractive way to overcome the disorder…