222 citations · 637 across the 16 of their papers we have counts for
16 papers
Observation of coherent flux-charge interaction in a gate-tunable fluxonium
Brian D. Isakov, Shikhar Singh, Adrian Parra-Rodriguez +7
Interactions that mix conjugate variables, such as the flux through a circuit element and the charge across it, lie outside the reach of the elementary couplings of superconducting…
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…
Junction-Intrinsic Dissipation in Hybrid Superconductor-Semiconductor Gatemon Qubits
Zhenhai Sun, David Feldstein-Bofill, Ksenia Shagalov +10
Superconducting transmon qubits based on hybrid superconductor-semiconductor Josephson junctions (gatemons) offer gate tunability, but their relaxation times remain well below thos…
Controlled Parity of Cooper Pair Tunneling in a Hybrid Superconducting Qubit
David Feldstein-Bofill, Leo Uhre Jakobsen, Ksenia Shagalov +9
Superconducting quantum circuits derive their nonlinearity from the Josephson energy-phase relation. Besides the fundamental term, this relation can also contain higher Fou…
Higher Josephson harmonics in a tunable double-junction transmon qubit
Ksenia Shagalov, David Feldstein-Bofill, Leo Uhre Jakobsen +11
Tunable Josephson harmonics open new avenues for qubit design. We demonstrate a superconducting circuit element consisting of a tunnel junction in series with a SQUID loop, yieldin…
Gate-Tunable Transmon Using Selective-Area-Grown Superconductor-Semiconductor Hybrid Structures on Silicon
A. Hertel, M. Eichinger, L. O. Andersen +12
We present a gate-voltage tunable transmon qubit (gatemon) based on planar InAs nanowires that are selectively grown on a high resistivity silicon substrate using III-V buffer laye…
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…
Signatures of a topological phase transition in a planar Josephson junction
A. Banerjee, O. Lesser, M. A. Rahman +12
A growing body of work suggests that planar Josephson junctions fabricated using superconducting hybrid materials provide a highly controllable route toward one-dimensional topolog…
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…
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…
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…
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…