Publications (39)
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…
Hot Electrons Regain Coherence in Semiconducting Nanowires
Jonathan Reiner, Abhay Kumar Nayak, Nurit Avraham +7
The higher the energy of a particle is above equilibrium the faster it relaxes due to the growing phase-space of available electronic states it can interact with. In the relaxation…
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…
Shortcuts to nonabelian braiding
Torsten Karzig, Falko Pientka, Gil Refael +1
Topological quantum information processing relies on adiabatic braiding of nonabelian quasiparticles. Performing the braiding operations in finite time introduces transitions out o…
Comparing tunneling spectroscopy and charge sensing of Andreev bound states in a semiconductor-superconductor hybrid nanowire structure
Deividas Sabonis, David van Zanten, Judith Suter +7
Transport studies of Andreev bound states (ABSs) are complicated by the interplay of charging effects and superconductivity. Here, we compare transport approaches to ABS spectrosco…
Scattering theory of adiabatic reaction forces due to out-of-equilibrium quantum environments
Mark Thomas, Torsten Karzig, Silvia Viola Kusminskiy +2
The Landauer-Buettiker theory of mesoscopic conductors was recently extended to nanoelectromechanical systems. In this extension, the adiabatic reaction forces exerted by the elect…
Energy Partitioning of Tunneling Currents into Luttinger Liquids
Torsten Karzig, Gil Refael, Leonid I. Glazman +1
Tunneling of electrons of definite chirality into a quantum wire creates counterpropagating excitations, carrying both charge and energy. We find that the partitioning of energy is…
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…
Boosting Majorana zero modes
Torsten Karzig, Gil Refael, Felix von Oppen
One-dimensional topological superconductors are known to host Majorana zero modes at domain walls terminating the topological phase. Their nonabelian nature allows for processing q…
Interaction effects in superconductor/quantum spin Hall devices: universal transport signatures and fractional Coulomb blockade
David Aasen, Shu-Ping Lee, Torsten Karzig +1
Interfacing s-wave superconductors and quantum spin Hall edges produces time-reversal-invariant topological superconductivity of a type that can not arise in strictly 1D systems. W…
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…
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…
Topological superconductivity in full shell proximitized nanowires
Roman M. Lutchyn, Georg W. Winkler, Bernard van Heck +4
We consider a new model system supporting Majorana zero modes based on semiconductor nanowires with a full superconducting shell. We demonstrate that, in the presence of spin-orbit…
Energy relaxation and thermalization of hot electrons in quantum wires
Torsten Karzig, Leonid I. Glazman, Felix von Oppen
We develop a theory of energy relaxation and thermalization of hot carriers in real quantum wires. Our theory is based on a controlled perturbative approach for large excitation en…
Observation of 2e-periodic Supercurrents in Nanowire Single-Cooper-Pair Transistors
Jasper van Veen, Alex Proutski, Torsten Karzig +7
Parity control of superconducting islands hosting Majorana zero modes (MZMs) is required to operate topological qubits made from proximitized semiconductor nanowires. We, therefore…
Topological polaritons from photonic Dirac cones coupled to excitons in a magnetic field
Kexin Yi, Torsten Karzig
We introduce an alternative scheme for creating topological polaritons (topolaritons) by exploiting the presence of photonic Dirac cones in photonic crystals with triangular lattic…
Optimal Control of Majorana Zero Modes
Torsten Karzig, Armin Rahmani, Felix von Oppen +1
Braiding of Majorana zero modes provides a promising platform for quantum information processing, which is topologically protected against errors. Strictly speaking, however, the s…
Protocol to identify a topological superconducting phase in a three-terminal device
Dmitry I. Pikulin, Bernard van Heck, Torsten Karzig +13
We develop a protocol to determine the presence and extent of a topological phase with Majorana zero modes in a hybrid superconductor-semiconductor device. The protocol is based on…
Scalable Designs for Quasiparticle-Poisoning-Protected Topological Quantum Computation with Majorana Zero Modes
Torsten Karzig, Christina Knapp, Roman M. Lutchyn +9
We present designs for scalable quantum computers composed of qubits encoded in aggregates of four or more Majorana zero modes, realized at the ends of topological superconducting…
Topologically protected braiding in a single wire using Floquet Majorana modes
Bela Bauer, T. Pereg-Barnea, Torsten Karzig +4
Majorana zero modes are a promising platform for topologically protected quantum information processing. Their non-Abelian nature, which is key for performing quantum gates, is mos…
Quasiparticle poisoning of Majorana qubits
Torsten Karzig, William S. Cole, Dmitry I. Pikulin
Qubits based on Majorana zero modes are a promising path towards topological quantum computing. Such qubits, though, are susceptible to quasiparticle poisoning which does not have…
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…
Robust Majorana magic gates via measurements
Torsten Karzig, Yuval Oreg, Gil Refael +1
phase gates (magic gates or T-gates) are crucial to augment topological systems based on Majorana zero modes to full quantum universality. We present a scheme based on a com…
Modeling noise and error correction for Majorana-based quantum computing
Christina Knapp, Michael Beverland, Dmitry I. Pikulin +1
Majorana-based quantum computing seeks to use the non-local nature of Majorana zero modes to store and manipulate quantum information in a topologically protected way. While noise…
A geometric protocol for a robust Majorana magic gate
Torsten Karzig, Yuval Oreg, Gil Refael +1
A universal quantum computer requires a full set of basic quantum gates. With Majorana bound states one can form all necessary quantum gates in a topologically protected way, bar o…
Roadmap to fault tolerant quantum computation using topological qubit arrays
David Aasen, Morteza Aghaee, Zulfi Alam +179
We describe a concrete device roadmap towards a fault-tolerant quantum computing architecture based on noise-resilient, topologically protected Majorana-based qubits. Our roadmap e…
Topological Polaritons and Excitons in Garden Variety Systems
Charles-Edouard Bardyn, Torsten Karzig, Gil Refael +1
Topological polaritons (aka topolaritons) present a new frontier for topological behavior in solid-state systems. They combine light and matter, which allows to probe and manipulat…
Predictive simulations of the dynamical response of mesoscopic devices
Samuel Boutin, Torsten Karzig, Tareq El Dandachi +4
As the complexity of mesoscopic quantum devices increases, simulations are becoming an invaluable tool for understanding their behavior. This is especially true for the superconduc…
Topological Polaritons
Torsten Karzig, Charles-Edouard Bardyn, Netanel Lindner +1
The interaction between light and matter can give rise to novel topological states. This principle was recently exemplified in Floquet topological insulators, where \emph{classical…
Chiral Bogoliubons in Nonlinear Bosonic Systems
Charles-Edouard Bardyn, Torsten Karzig, Gil Refael +1
We present a versatile scheme for creating topological Bogoliubov excitations in weakly interacting bosonic systems. Our proposal relies on a background stationary field that consi…
Dephasing of Majorana-based qubits
Christina Knapp, Torsten Karzig, Roman Lutchyn +1
We analyze charging-energy-protected Majorana-based qubits, focusing on the residual dephasing that is present when the distance between Majorana zero modes (MZMs) is insufficient…
Photon Assisted Tunneling of Zero Modes in a Majorana Wire
David M. T. van Zanten, Deividas Sabonis, Judith Suter +8
Hybrid nanowires with proximity-induced superconductivity in the topological regime host Majorana zero modes (MZMs) at their ends, and networks of such structures can produce topol…
Exponential Lifetime Improvement in Topological Quantum Memories
Charles-Edouard Bardyn, Torsten Karzig
We propose a simple yet efficient mechanism for passive error correction in topological quantum memories. Our scheme relies on driven-dissipative ancilla systems which couple to lo…
Floquet Majorana bound states in voltage-biased Planar Josephson Junctions
Changnan Peng, Arbel Haim, Torsten Karzig +2
We study a planar Josephson junction under an applied DC voltage bias in the presence of an in-plane magnetic field. Upon tuning the bias voltage across the junction, ,…
Signatures of critical full counting statistics in a quantum-dot chain
Torsten Karzig, Felix von Oppen
We consider current shot noise and the full counting statistics in a chain of quantum dots which exhibits a continuous non-equilibrium phase transition as a function of the tunnel…
Visibility of noisy quantum dot-based measurements of Majorana qubits
Aleksei Khindanov, Dmitry Pikulin, Torsten Karzig
Measurement schemes of Majorana zero modes (MZMs) based on quantum dots (QDs) are of current interest as they provide a scalable platform for topological quantum computation. In a…
Langevin dynamics of a heavy particle and orthogonality effects
Mark Thomas, Torsten Karzig, Silvia Viola Kusminskiy
The dynamics of a classical heavy particle moving in a quantum environment is determined by a Langevin equation which encapsulates the effect of the environment-induced reaction fo…
Relaxation and edge reconstruction in integer quantum Hall systems
Torsten Karzig, Alex Levchenko, Leonid I. Glazman +1
The interplay between the confinement potential and electron-electron interactions causes reconstructions of Quantum Hall edges. We study the consequences of this edge reconstructi…
Dynamics of Majorana-based qubits operated with an array of tunable gates
Bela Bauer, Torsten Karzig, Ryan V. Mishmash +2
We study the dynamics of Majorana zero modes that are shuttled via local tuning of the electrochemical potential in a superconducting wire. By performing time-dependent simulations…