Searched for: author%3A%22Krogstrup%2C+P.%22
(1 - 17 of 17)
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Stavenga, T. (author), Khan, S. A. (author), Liu, Y. (author), Krogstrup, P. (author), DiCarlo, L. (author)
Quantum hardware based on circuit quantum electrodynamics makes extensive use of airbridges to suppress unwanted modes of wave propagation in coplanar-waveguide transmission lines. Airbridges also provide an interconnect enabling transmission lines to cross. Traditional airbridge fabrication produces a curved profile by reflowing resist at...
journal article 2023
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Wesdorp, J.J. (author), Grünhaupt, L. (author), Vaartjes, A. (author), Pita-Vidal, Marta (author), Bargerbos, A. (author), Splitthoff, L.J. (author), Krogstrup, P. (author), van Heck, B. (author), de Lange, G. (author)
Josephson junctions in InAs nanowires proximitized with an Al shell can host gate-tunable Andreev bound states. Depending on the bound state occupation, the fermion parity of the junction can be even or odd. Coherent control of Andreev bound states has recently been achieved within each parity sector, but it is impeded by incoherent parity...
journal article 2023
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Fatemi, V. (author), Kurilovich, P. D. (author), Hays, M. (author), Bouman, D. (author), Connolly, T. (author), Diamond, S. (author), Krogstrup, P. (author), Geresdi, A. (author), Devoret, M. H. (author)
Electrostatic charging affects the many-body spectrum of Andreev states, yet its influence on their microwave properties has not been elucidated. We developed a circuit quantum electrodynamics probe that, in addition to transition spectroscopy, measures the microwave susceptibility of different states of a semiconductor nanowire weak link...
journal article 2022
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Kringhøj, A. (author), Larsen, T. W. (author), Erlandsson, O. (author), Uilhoorn, W. (author), Kroll, J. (author), Hesselberg, M. (author), McNeil, R. P.G. (author), Krogstrup, P. (author), Casparis, L. (author), Marcus, C. M. (author)
We present a hybrid semiconductor-based superconducting qubit device that remains coherent at magnetic fields up to 1 T. The qubit transition frequency exhibits periodic oscillations with the magnetic field, consistent with interference effects due to the magnetic flux threading the cross section of the proximitized semiconductor nanowire...
journal article 2021
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Kringhøj, A. (author), Winkler, G. W. (author), Larsen, T. W. (author), Sabonis, D. (author), Erlandsson, O. (author), Krogstrup, P. (author), van Heck, B. (author), Petersson, K. D. (author), Marcus, C. M. (author)
We investigate transmon qubits made from semiconductor nanowires with a fully surrounding superconducting shell. In the regime of reentrant superconductivity associated with the destructive Little-Parks effect, numerous coherent transitions are observed in the first reentrant lobe, where the shell carries 2π winding of superconducting phase,...
journal article 2021
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Liu, C. (author), Schuwalow, Sergej (author), Liu, Yu (author), Vilkelis, K. (author), Manesco, A. L.R. (author), Krogstrup, P. (author), Wimmer, M.T. (author)
We study the electronic properties of InAs/EuS/Al heterostructures as explored in a recent experiment, combining both spectroscopic results and microscopic device simulations. In particular, we use angle-resolved photoemission spectroscopy to investigate the band bending at the InAs/EuS interface. The resulting band offset value serves as an...
journal article 2021
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de Jong, D. (author), Prosko, C.G. (author), Waardenburg, D.M.A. (author), Han, L. (author), Malinowski, F.K. (author), Krogstrup, P. (author), Kouwenhoven, Leo P. (author), Koski, J.V. (author), Pfaff, W. (author)
Superconducting resonators enable fast characterization and readout of mesoscopic quantum devices. Finding ways to perform measurements of interest on such devices using resonators only is therefore of great practical relevance. We report an experimental investigation of an InAs nanowire multiquantum dot device by probing gigahertz resonators...
journal article 2021
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Kringhøj, A. (author), van Heck, B. (author), Larsen, T. W. (author), Erlandsson, O. (author), Sabonis, D. (author), Krogstrup, P. (author), Casparis, L. (author), Petersson, K. D. (author), Marcus, C. M. (author)
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 resonance, dispersion is drastically reduced compared to conventional transmons with corresponding Josephson and charging energies. We develop a model of qubit dispersion...
journal article 2020
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Sabonis, Deividas (author), Erlandsson, Oscar (author), Kringhøj, Anders (author), van Heck, B. (author), Larsen, Thorvald W. (author), Petkovic, I. (author), Krogstrup, P. (author), Petersson, Karl D. (author), Marcus, Charles M. (author)
A semiconductor transmon with an epitaxial Al shell fully surrounding an InAs nanowire core is investigated in the low EJ/EC regime. Little-Parks oscillations as a function of flux along the hybrid wire axis are destructive, creating lobes of reentrant superconductivity separated by a metallic state at a half quantum of applied flux. In the...
journal article 2020
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de Jong, D. (author), van Veen, J. (author), Binci, L. (author), Singh, A. (author), Krogstrup, P. (author), Kouwenhoven, Leo P. (author), Pfaff, W. (author), Watson, J.D. (author)
Dispersive sensing is a powerful technique that enables scalable and high-fidelity readout of solid-state quantum bits. In particular, gate-based dispersive sensing has been proposed as the readout mechanism for future topological qubits, which can be measured by single electrons tunneling through zero-energy modes. The development of such a...
journal article 2019
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van Veen, J. (author), de Jong, D. (author), Han, L. (author), Prosko, C.G. (author), Krogstrup, P. (author), Watson, J.D. (author), Kouwenhoven, Leo P. (author), Pfaff, W. (author)
We report direct detection of charge tunneling between a quantum dot and a superconducting island through radio-frequency gate sensing. We are able to resolve spin-dependent quasiparticle tunneling as well as two-particle tunneling involving Cooper pairs. The quantum dot can act as an RF-only sensor to characterize the superconductor addition...
journal article 2019
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Lüthi, F. (author), Stavenga, T. (author), Enzing, O.W. (author), Bruno, A. (author), Dickel, C. (author), Langford, N.K. (author), Rol, M.A. (author), Jespersen, T. S. (author), Nygård, J. (author), Krogstrup, P. (author), DiCarlo, L. (author)
We present an experimental study of flux- and gate-tunable nanowire transmons with state-of-the-art relaxation time allowing quantitative extraction of flux and charge noise coupling to the Josephson energy. We evidence coherence sweet spots for charge, tuned by voltage on a proximal side gate, where first order sensitivity to switching two...
journal article 2018
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van Veen, J. (author), Proutski, A. (author), Karzig, Torsten (author), Pikulin, D. (author), Lutchyn, Roman M. (author), Nygård, Jesper (author), Krogstrup, P. (author), Geresdi, A. (author), Kouwenhoven, Leo P. (author), Watson, J.D. (author)
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-Cooper-pair transistors (SCPTs) to evaluate the feasibility of this material system. In particular, we...
journal article 2018
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Aseev, P. (author), Khan, Sabbir A. (author), Liu, Y. (author), Fursina, A. (author), Boekhout, F. (author), Koops, R. (author), Uccelli, E. (author), Kouwenhoven, Leo P. (author), Krogstrup, P. (author)
III-V semiconductor nanowires have shown great potential in various quantum transport experiments. However, realizing a scalable high-quality nanowire-based platform that could lead to quantum information applications has been challenging. Here, we study the potential of selective area growth by molecular beam epitaxy of InAs nanowire...
journal article 2018
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Lutchyn, R. M. (author), Bakkers, E.P.A.M. (author), Kouwenhoven, Leo P. (author), Krogstrup, P. (author), Marcus, C.M. (author), Oreg, Y. (author)
Realizing topological superconductivity and Majorana zero modes in the laboratory is a major goal in condensed-matter physics. In this Review, we survey the current status of this rapidly developing field, focusing on proposals for the realization of topological superconductivity in semiconductor–superconductor heterostructures. We examine...
journal article 2018
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Hays, M. (author), de Lange, G. (author), Serniak, K. (author), van Woerkom, D.J. (author), Bouman, D. (author), Krogstrup, P. (author), Nygård, J. (author), Geresdi, A. (author), Devoret, M. H. (author)
The modern understanding of the Josephson effect in mesosopic devices derives from the physics of Andreev bound states, fermionic modes that are localized in a superconducting weak link. Recently, Josephson junctions constructed using semiconducting nanowires have led to the realization of superconducting qubits with gate-tunable Josephson...
journal article 2018
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van Woerkom, D.J. (author), Proutski, A. (author), Van Heck, Bernard (author), Bouman, D. (author), Väyrynen, Jukka I. (author), Glazman, Leonid I. (author), Krogstrup, P. (author), Nygård, Jesper (author), Kouwenhoven, Leo P. (author), Geresdi, A. (author)
The superconducting proximity effect in semiconductor nanowires has recently enabled the study of new superconducting architectures, such as gate-tunable superconducting qubits and multiterminal Josephson junctions. As opposed to their metallic counterparts, the electron density in semiconductor nanosystems is tunable by external...
journal article 2017
Searched for: author%3A%22Krogstrup%2C+P.%22
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