Torsten Karzig
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View article: Data Catalog for: Flux-induced topological superconductivity in full-shell nanowires
Data Catalog for: Flux-induced topological superconductivity in full-shell nanowires Open
Data Catalog for: Flux-induced topological superconductivity in full-shell nanowires
View article: Interferometric single-shot parity measurement in InAs–Al hybrid devices
Interferometric single-shot parity measurement in InAs–Al hybrid devices Open
The fusion of non-Abelian anyons is a fundamental operation in measurement-only topological quantum computation1. In one-dimensional topological superconductors (1DTSs)2-4, fusion amounts to a determination of the shared fermion parity of …
View article: Predictive simulations of the dynamical response of mesoscopic devices
Predictive simulations of the dynamical response of mesoscopic devices Open
As the complexity of mesoscopic quantum devices increases, simulations are becoming an invaluable tool for understanding their behavior. This is especially true for the superconductor-semiconductor heterostructures used to build Majorana-b…
View article: Roadmap to fault tolerant quantum computation using topological qubit arrays
Roadmap to fault tolerant quantum computation using topological qubit arrays Open
We describe a concrete device roadmap towards a fault-tolerant quantum computing architecture based on noise-resilient, topologically protected Majorana-based qubits. Our roadmap encompasses four generations of devices: a single-qubit devi…
View article: Interferometric Single-Shot Parity Measurement in an InAs-Al Hybrid Device
Interferometric Single-Shot Parity Measurement in an InAs-Al Hybrid Device Open
The fusion of non-Abelian anyons or topological defects is a fundamental operation in measurement-only topological quantum computation. In topological superconductors, this operation amounts to a determination of the shared fermion parity …
View article: InAs-Al hybrid devices passing the topological gap protocol
InAs-Al hybrid devices passing the topological gap protocol Open
Topological phases of matter can enable highly stable qubits with small footprints, fast gate times, and digital control. These hardware-protected qubits must be fabricated with a material combination in which a topological phase can relia…
View article: InAs-Al Hybrid Devices Passing the Topological Gap Protocol
InAs-Al Hybrid Devices Passing the Topological Gap Protocol Open
We present measurements and simulations of semiconductor-superconductor heterostructure devices that are consistent with the observation of topological superconductivity and Majorana zero modes. The devices are fabricated from high-mobilit…
View article: Comparing tunneling spectroscopy and charge sensing of Andreev bound states in a semiconductor-superconductor hybrid nanowire structure
Comparing tunneling spectroscopy and charge sensing of Andreev bound states in a semiconductor-superconductor hybrid nanowire structure Open
Transport studies of Andreev bound states (ABSs) are complicated by the interplay of charging effects and superconductivity. Here, we compare transport approaches to ABS spectroscopy in a semiconductor-superconductor island to a charge-sen…
View article: Floquet Majorana bound states in voltage-biased planar Josephson junctions
Floquet Majorana bound states in voltage-biased planar Josephson junctions Open
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 V_J, the two ends of the junction are shown to simultaneously host both z…
View article: Protocol to identify a topological superconducting phase in a three-terminal device
Protocol to identify a topological superconducting phase in a three-terminal device Open
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 conductance measurements in a three-terminal device with t…
View article: Quasiparticle Poisoning of Majorana Qubits
Quasiparticle Poisoning of Majorana Qubits Open
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 to be small by topological argument. We study the main sour…
View article: Report on 2007.11024v2
Report on 2007.11024v2 Open
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 coupled qubit-QD setup we calculate the dependence of the ch…
View article: Report on 2007.11024v2
Report on 2007.11024v2 Open
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 coupled qubit-QD setup we calculate the dependence of the ch…
View article: Report on 2007.11024v2
Report on 2007.11024v2 Open
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 coupled qubit-QD setup we calculate the dependence of the ch…
View article: Simulation code for: Flux-induced topological superconductivity in full-shell nanowires
Simulation code for: Flux-induced topological superconductivity in full-shell nanowires Open
Simulation code for: Flux-induced topological superconductivity in full-shell nanowires
View article: Simulation code for: Flux-induced topological superconductivity in full-shell nanowires
Simulation code for: Flux-induced topological superconductivity in full-shell nanowires Open
Simulation code for: Flux-induced topological superconductivity in full-shell nanowires
View article: Replication data for: Flux-induced topological superconductivity in full-shell nanowires
Replication data for: Flux-induced topological superconductivity in full-shell nanowires Open
Replication data for: Flux-induced topological superconductivity in full-shell nanowires
View article: Replication data for: Flux-induced topological superconductivity in full-shell nanowires
Replication data for: Flux-induced topological superconductivity in full-shell nanowires Open
Additional replication data for: Flux-induced topological superconductivity in full-shell nanowires
View article: Suppressing quasiparticle poisoning with a voltage-controlled filter
Suppressing quasiparticle poisoning with a voltage-controlled filter Open
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 nearby radio-frequency quantum dot as a charge sensor. We dem…
View article: Topologically protected braiding in a single wire using Floquet Majorana modes
Topologically protected braiding in a single wire using Floquet Majorana modes Open
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 most prominently exhibited through braiding. While originally …
View article: Robust Majorana magic gates via measurements
Robust Majorana magic gates via measurements Open
$\\pi/8$ phase gates (magic gates or T-gates) are crucial to augment\ntopological systems based on Majorana zero modes to full quantum universality.\nWe present a scheme based on a combination of projective measurements and\nnon-adiabatic …
View article: Magnetic-field-dependent quasiparticle dynamics of nanowire single-Cooper-pair transistors
Magnetic-field-dependent quasiparticle dynamics of nanowire single-Cooper-pair transistors Open
Parity control of superconducting islands hosting Majorana zero modes (MZMs) is required to operate topological qubits made from proximitized semiconductor nanowires. We test this control by studying parity effects in hybrid InAs-Al single…
View article: Topological superconductivity in full shell proximitized nanowires
Topological superconductivity in full shell proximitized nanowires Open
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 coupling in the semiconductor induced by a radial electric…
View article: Erratum: Dephasing of Majorana-based qubits [Phys. Rev. B 97, 125404 (2018)]
Erratum: Dephasing of Majorana-based qubits [Phys. Rev. B 97, 125404 (2018)] Open
Received 6 July 2018DOI:https://doi.org/10.1103/PhysRevB.98.039903©2018 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasMajorana fermionsTopological quantum computingTopological superconductorsQuantum InformationCond…
View article: Report on 1803.05451v1
Report on 1803.05451v1 Open
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 of microscopic lattice models, we show that diabatic correc…
View article: Dephasing of Majorana-based qubits
Dephasing of Majorana-based qubits Open
We analyze charging-energy-protected Majorana-based qubits, focusing on the\nresidual dephasing that is present when the distance between Majorana zero\nmodes (MZMs) is insufficient for full topological protection. We argue that the\nleadi…
View article: Scalable designs for quasiparticle-poisoning-protected topological quantum computation with Majorana zero modes
Scalable designs for quasiparticle-poisoning-protected topological quantum computation with Majorana zero modes Open
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 wire segments that are assembled into superconducting islan…
View article: Publisher’s Note: Hot Electrons Regain Coherence in Semiconducting Nanowires [Phys. Rev. X <b>7</b>, 021016 (2017)]
Publisher’s Note: Hot Electrons Regain Coherence in Semiconducting Nanowires [Phys. Rev. X <b>7</b>, 021016 (2017)] Open
Received 19 May 2017DOI:https://doi.org/10.1103/PhysRevX.7.029902Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attr…
View article: Hot Electrons Regain Coherence in Semiconducting Nanowires
Hot Electrons Regain Coherence in Semiconducting Nanowires Open
The higher the energy of a particle is above equilibrium the faster it\nrelaxes due to the growing phase-space of available electronic states it can\ninteract with. In the relaxation process phase coherence is lost, thus limiting\nhigh ene…
View article: Interaction effects in superconductor/quantum spin Hall devices: Universal transport signatures and fractional Coulomb blockade
Interaction effects in superconductor/quantum spin Hall devices: Universal transport signatures and fractional Coulomb blockade Open
Interfacing s-wave superconductors and quantum spin Hall edges produces\ntime-reversal-invariant topological superconductivity of a type that can not\narise in strictly 1D systems. With the aim of establishing sharp fingerprints\nof this n…