422 citations · 1.5k across the 20 of their papers we have counts for
20 papers
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…
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…
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…
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…
Parity switching in a full-shell superconductor-semiconductor nanowire qubit
O. Erlandsson, D. Sabonis, A. Kringhøj +4
The rate of charge-parity switching in a full-shell superconductor-semiconductor nanowire qubit is measured by directly monitoring the dispersive shift of a readout resonator. At z…
Andreev Modes from Phase Winding in a Full-shell Nanowire-based Transmon
A. Kringhøj, G. W. Winkler, T. W. Larsen +6
We investigate transmon qubits made from semiconductor nanowires with a fully surrounding superconducting shell. In the regime of reentrant superconductivity associated with the de…
Destructive Little-Parks Effect in a Full-Shell Nanowire-based Transmon
Deividas Sabonis, Oscar Erlandsson, Anders Kringhøj +6
A semiconductor transmon with an epitaxial Al shell fully surrounding an InAs nanowire core is investigated in the low regime. Little-Parks oscillations as a function of…
A Parity-Protected Superconductor-Semiconductor Qubit
T. W. Larsen, M. E. Gershenson, L. Casparis +7
Coherence of superconducting qubits can be improved by implementing designs that protect the parity of Cooper pairs on superconducting islands. Here, we introduce a parity-protecte…
Suppressed Charge Dispersion via Resonant Tunneling in a Single-Channel Transmon
A. Kringhøj, B. van Heck, T. W. Larsen +6
We demonstrate strong suppression of charge dispersion in a semiconductor-based transmon qubit across Josephson resonances associated with a quantum dot in the junction. On resonan…
Controlled DC Monitoring of a Superconducting Qubit
A. Kringhøj, T. W. Larsen, B. van Heck +7
Creating a transmon qubit using semiconductor-superconductor hybrid materials not only provides electrostatic control of the qubit frequency, it also allows parts of the circuit to…
Quantum interference device for controlled two-qubit operations
Niels Jakob Søe Loft, Morten Kjaergaard, Lasse Bjørn Kristensen +5
Universal quantum computing relies on high-fidelity entangling operations. Here we demonstrate that four coupled qubits can operate as a quantum gate, where two qubits control the…
Voltage-Controlled Superconducting Quantum Bus
L. Casparis, N. J. Pearson, A. Kringhøj +6
We demonstrate the ability of an epitaxial semiconductor-superconductor nanowire to serve as a field-effect switch to tune a superconducting cavity. Two superconducting gatemon qub…
Superconducting Gatemon Qubit based on a Proximitized Two-Dimensional Electron Gas
Lucas Casparis, Malcolm R. Connolly, Morten Kjaergaard +11
The coherent tunnelling of Cooper pairs across Josephson junctions (JJs) generates a nonlinear inductance that is used extensively in quantum information processors based on superc…
Anharmonicity of a Gatemon Qubit with a Few-Mode Josephson Junction
A. Kringhøj, L. Casparis, M. Hell +8
Coherent operation of gate-voltage-controlled hybrid transmon qubits (gatemons) based on semiconductor nanowires was recently demonstrated. Here we experimentally investigate the a…
Gatemon Benchmarking and Two-Qubit Operation
L. Casparis, T. W. Larsen, M. S. Olsen +5
Recent experiments have demonstrated superconducting transmon qubits with semiconductor nanowire Josephson junctions. These hybrid gatemon qubits utilize field effect tunability ch…
A Semiconductor Nanowire-Based Superconducting Qubit
T. W. Larsen, K. D. Petersson, F. Kuemmeth +4
We introduce a hybrid qubit based on a semiconductor nanowire with an epitaxially grown superconductor layer. Josephson energy of the transmon-like device ("gatemon") is controlled…
Hole Spin Coherence in a Ge/Si Heterostructure Nanowire
A. P. Higginbotham, T. W. Larsen, J. Yao +4
Relaxation and dephasing of hole spins are measured in a gate-defined Ge/Si nanowire double quantum dot using a fast pulsed-gate method and dispersive readout. An inhomogeneous dep…
Antilocalization of Coulomb Blockade in a Ge-Si Nanowire
A. P. Higginbotham, F. Kuemmeth, T. W. Larsen +5
The distribution of Coulomb blockade peak heights as a function of magnetic field is investigated experimentally in a Ge-Si nanowire quantum dot. Strong spin-orbit coupling in this…