222 citations · 1.6k across the 25 of their papers we have counts for
26 papers
Reversible field-free superconducting diode effect controlled by an antiferromagnet
Filip Krizek, Kamil Olejník, Tobias Edwinson +19
The semiconductor diode, which allows current to flow preferentially in one direction, is a fundamental building block of numerous modern electronic circuits. Its superconducting a…
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…
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…
Local and Non-local Microwave Impedance of a Three-Terminal Hybrid Device
B. Harlech-Jones, S. J. Waddy, J. D. S. Witt +8
We report microwave impedance measurements of a superconductor-semiconductor hybrid nanowire device with three terminals (3T). Our technique makes use of transmission line resonato…
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…
Measurement circuit effects in three-terminal electrical transport measurements
Esteban A. Martinez, Andreas Pöschl, Esben Bork Hansen +4
In this article we study measurement circuit effects in three-terminal electrical transport measurements arising from finite line impedances. We provide exact expressions relating…
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…
Microwave Sensing of Andreev Bound States in a Gate-Defined Superconducting Quantum Point Contact
Vivek Chidambaram, Anders Kringhøj, Lucas Casparis +11
We use a superconducting microresonator as a cavity to sense absorption of microwaves by a superconducting quantum point contact defined by surface gates over a proximitized two-di…
Closing of the Induced Gap in a Hybrid Superconductor-Semiconductor Nanowire
D. Puglia, E. A. Martinez, G. C. Ménard +8
Hybrid superconductor-semiconductor nanowires are predicted to undergo a field-induced phase transition from a trivial to a topological superconductor, marked by the closure and re…
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…
End-to-end correlated subgap states in hybrid nanowires
G. L. R. Anselmetti, E. A. Martinez, G. C. Ménard +9
End-to-end correlated bound states are investigated in superconductor-semiconductor hybrid nanowires at zero magnetic field. Peaks in subgap conductance are independently identifie…
Conductance-matrix symmetries of a three-terminal hybrid device
G. C. Ménard, G. L. R. Anselmetti, E. A. Martinez +10
We present conductance-matrix measurements of a three-terminal superconductor-semiconductor hybrid device consisting of two normal leads and one superconducting lead. Using a symme…
Nonlocal conductance spectroscopy of Andreev bound states: Symmetry relations and BCS charges
Jeroen Danon, Anna Birk Hellenes, Esben Bork Hansen +3
Two-terminal conductance spectroscopy of superconducting devices is a common tool for probing Andreev and Majorana bound states. Here, we study theoretically a three-terminal setup…
Selective-area chemical beam epitaxy of in-plane InAs one-dimensional channels grown on InP(001), InP(111)B, and InP(110) surfaces
Joon Sue Lee, Sukgeun Choi, Mihir Pendharkar +15
We report on the selective-area chemical beam epitaxial growth of InAs in-plane, one-dimensional (1-D) channels using patterned SiO-coated InP(001), InP(111)B, and InP(110) s…
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…
Field effect enhancement in buffered quantum nanowire networks
Filip Krizek, Joachim E. Sestoft, Pavel Aseev +15
III-V semiconductor nanowires have shown great potential in various quantum transport experiments. However, realizing a scalable high-quality nanowire-based platform that could lea…
Selective Area Grown Semiconductor-Superconductor Hybrids: A Basis for Topological Networks
S. Vaitiekėnas, A. M. Whiticar, M. T. Deng +8
We introduce selective area grown hybrid InAs/Al nanowires based on molecular beam epitaxy, allowing arbitrary semiconductor-superconductor networks containing loops and branches.…
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…
Magnetic cooling for microkelvin nanoelectronics on a cryofree platform
Mario Palma, Dario Maradan, Lucas Casparis +3
We present a parallel network of 16 demagnetization refrigerators mounted on a cryofree dilution refrigerator aimed to cool nanoelectronic devices to sub-millikelvin temperatures.…
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…
Tunnel-Junction Thermometry Down to Millikelvin Temperatures
A. V. Feshchenko, L. Casparis, I. M. Khaymovich +6
We present a simple on-chip electronic thermometer with the potential to operate down to 1 mK. It is based on transport through a single normal-metal - superconductor tunnel juncti…
GaAs Quantum Dot Thermometry Using Direct Transport and Charge Sensing
D. Maradan, L. Casparis, T. -M. Liu +5
We present measurements of the electron temperature using gate defined quantum dots formed in a GaAs 2D electron gas in both direct transport and charge sensing mode. Decent agreem…