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Bargerbos, A. (author), Splitthoff, L.J. (author), Pita-Vidal, Marta (author), Wesdorp, J.J. (author), Liu, Yu (author), Krogstrup, Peter (author), Kouwenhoven, Leo P. (author), Andersen, C.K. (author), Grünhaupt, L. (author)Quantum error correction will be an essential ingredient in realizing fault-tolerant quantum computing. However, most correction schemes rely on the assumption that errors are sufficiently uncorrelated in space and time. In superconducting qubits, this assumption is drastically violated in the presence of ionizing radiation, which creates bursts...journal article 2023
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Han, L. (author), Chan, M. (author), de Jong, D. (author), Prosko, C.G. (author), Badawy, Ghada (author), Gazibegovic, Sasa (author), Bakkers, Erik P.A.M. (author), Kouwenhoven, Leo P. (author), Malinowski, F.K. (author), Pfaff, Wolfgang (author)Utilizing dispersive gate sensing (DGS), we investigate the spin-orbit field (BSO) orientation in a many-electron double quantum dot (DQD) defined in an InSb nanowire. While characterizing the interdot tunnel couplings, we find the measured dispersive signal depends on the electron-charge occupancy, as well as on the amplitude and orientation...journal article 2023
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Dvir, T. (author), Wang, Guanzhong (author), van Loo, N. (author), Liu, C. (author), Mazur, G.P. (author), Bordin, A. (author), ten Haaf, S.L.D. (author), van Driel, D. (author), Zatelli, F. (author), Li, X. (author), Malinowski, F.K. (author), Gazibegovic, Sasa (author), Badawy, G.H.A. (author), Bakkers, Erik P.A.M. (author), Wimmer, M.T. (author), Kouwenhoven, Leo P. (author)Majorana bound states constitute one of the simplest examples of emergent non-Abelian excitations in condensed matter physics. A toy model proposed by Kitaev shows that such states can arise at the ends of a spinless p-wave superconducting chain<sup>1</sup>. Practical proposals for its realization<sup>2,3</sup> require coupling neighbouring...journal article 2023
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Bargerbos, A. (author), Pita-Vidal, Marta (author), Splitthoff, L.J. (author), Grünhaupt, L. (author), Wesdorp, J.J. (author), Andersen, C.K. (author), Liu, Yu (author), Kouwenhoven, Leo P. (author), van Heck, B. (author)We realize a hybrid superconductor-semiconductor transmon device in which the Josephson effect is controlled by a gate-defined quantum dot in an InAs-Al nanowire. Microwave spectroscopy of the transition spectrum of the transmon allows us to probe the ground-state parity of the quantum dot as a function of the gate voltages, the external...journal article 2022
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Wang, Guanzhong (author), Dvir, T. (author), van Loo, N. (author), Mazur, G.P. (author), Gazibegovic, Sasa (author), Badawy, G.H.A. (author), Bakkers, Erik P.A.M. (author), Kouwenhoven, Leo P. (author), de Lange, G. (author)The lowest-energy excitations of superconductors do not carry an electric charge, as their wave function is equally electron-like and hole-like. This fundamental property is not easy to study in electrical measurements that rely on the charge to generate an observable signal. The ability of a quantum dot to act as a charge filter enables us...journal article 2022
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Malinowski, F.K. (author), Han, L. (author), de Jong, D. (author), Wang, Ji Yin (author), Prosko, C.G. (author), Krogstrup, Peter (author), Bakkers, Erik P.A.M. (author), Kouwenhoven, Leo P. (author), Koski, Jonne V. (author)We demonstrate the use of radio-frequency (rf) resonators to measure the capacitance of nanoscale semiconducting devices in field-effect transistor configurations. The rf resonator is attached to the gate or the lead of the device. Consequently, tuning the carrier density in the conducting channel of the device affects the resonance frequency...journal article 2022
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Wang, Ji Yin (author), van Loo, N. (author), Mazur, G.P. (author), Levajac, V. (author), Malinowski, F.K. (author), Lemang, M.F. (author), Borsoi, F. (author), Badawy, G.H.A. (author), Quintero Perez, M. (author), Heedt, S. (author), Kouwenhoven, Leo P. (author)We systematically study three-terminal InSb-Al nanowire devices by using radio-frequency reflectometry. Tunneling spectroscopy measurements on both ends of the hybrid nanowires are performed while systematically varying the chemical potential, magnetic field, and junction transparencies. Identifying the lowest-energy state allows for the...journal article 2022
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Wang, Guanzhong (author), Dvir, T. (author), Mazur, G.P. (author), Liu, C. (author), van Loo, N. (author), ten Haaf, S.L.D. (author), Bordin, A. (author), Gazibegovic, Sasa (author), Badawy, G.H.A. (author), Bakkers, Erik P.A.M. (author), Wimmer, M.T. (author), Kouwenhoven, Leo P. (author)In most naturally occurring superconductors, electrons with opposite spins form Cooper pairs. This includes both conventional s-wave superconductors such as aluminium, as well as high-transition-temperature, d-wave superconductors. Materials with intrinsic p-wave superconductivity, hosting Cooper pairs made of equal-spin electrons, have not...journal article 2022
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WANG, J. (author), Schrade, Constantin (author), Levajac, V. (author), van Driel, D. (author), Li, K. (author), Badawy, G.H.A. (author), Lee, J.S. (author), Kouwenhoven, Leo P. (author), Shen, Jie (author)We study a Cooper pair transistor realized by two Josephson weak links that enclose a superconducting island in an InSb-Al hybrid nanowire. When the nanowire is subject to a magnetic field, isolated subgap levels arise in the superconducting island and, because of the Coulomb blockade, mediate a supercurrent by coherent cotunneling of Cooper...journal article 2022
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Mazur, G.P. (author), van Loo, N. (author), Wang, J. (author), Dvir, T. (author), Wang, Guanzhong (author), Korneychuk, S. (author), Borsoi, F. (author), Dekker, R.C. (author), Badawy, G.H.A. (author), Vinke, Peter (author), Quintero Perez, M. (author), Heedt, S. (author), Kouwenhoven, Leo P. (author)In superconducting quantum circuits, aluminum is one of the most widely used materials. It is currently also the superconductor of choice for the development of topological qubits. However, aluminum-based devices suffer from poor magnetic field compatibility. Herein, this limitation is resolved by showing that adatoms of heavy elements (e.g.,...journal article 2022
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op het Veld, R.L.M. (author), Xu, D. (author), Schaller, V. (author), Wang, Q. (author), de Moor, M.W.A. (author), Hesselmann, Bart (author), Vermeulen, K.J. (author), Bommer, J.D.S. (author), Kouwenhoven, Leo P. (author), Zhang, H. (author)The Data availability statement of this article has been modified to add the accession link to the raw data. The old Data availability statement read “Materials and data that support the findings of this research are available within the paper. All data are available from the corresponding author upon request”. This has been replaced by ...journal article 2021
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Heedt, S. (author), Quintero Perez, M. (author), Borsoi, F. (author), van Loo, N. (author), Mazur, G.P. (author), Ammerlaan, M.L.I. (author), Li, K. (author), Korneychuk, S. (author), van de Poll, M.A.Y. (author), de Jong, N. (author), Aseev, P. (author), van Hoogdalem, K.A. (author), Kouwenhoven, Leo P. (author)The realization of hybrid superconductor–semiconductor quantum devices, in particular a topological qubit, calls for advanced techniques to readily and reproducibly engineer induced superconductivity in semiconductor nanowires. Here, we introduce an on-chip fabrication paradigm based on shadow walls that offers substantial advances in device...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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Borsoi, F. (author), Mazur, G.P. (author), van Loo, N. (author), Bourdet, L.R. (author), Li, K. (author), Fursina, A. (author), Wang, J. (author), Levajac, V. (author), Memisevic, E. (author), van Hoogdalem, K.A. (author), Kouwenhoven, Leo P. (author), Heedt, S. (author), Quintero Perez, M. (author)Semiconducting–superconducting hybrids are vital components for the realization of high-performance nanoscale devices. In particular, semiconducting–superconducting nanowires attract widespread interest owing to the possible presence of non-abelian Majorana zero modes, which are quasiparticles that hold promise for topological quantum...journal article 2021
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Shen, J. (author), Winkler, G. W. (author), Borsoi, F. (author), Heedt, S. (author), Levajac, V. (author), Wang, J. (author), van Driel, D. (author), Bouman, D. (author), Kouwenhoven, Leo P. (author), van Heck, B. (author)We measure the charge periodicity of Coulomb blockade conductance oscillations of a hybrid InSb-Al island as a function of gate voltage and parallel magnetic field. The periodicity changes from to at a gate-dependent value of the magnetic field, , decreasing from a high to a low limit upon increasing the gate voltage. In the gate voltage...journal article 2021
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Pita-Vidal, Marta (author), Bargerbos, A. (author), Yang, C. (author), van Woerkom, D.J. (author), Pfaff, W. (author), Haider, S.N. (author), Krogstrup, Peter (author), Kouwenhoven, Leo P. (author), de Lange, G. (author), Kou, A. (author)Hybrid superconducting circuits, which integrate nonsuperconducting elements into a circuit quantum electrodynamics (cQED) architecture, expand the possible applications of cQED. Building hybrid circuits that work in large magnetic fields presents even further possibilities, such as the probing of spin-polarized Andreev bound states and the...journal article 2020
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op het Veld, R.L.M. (author), Xu, D. (author), Schaller, V. (author), Wang, Q. (author), de Moor, M.W.A. (author), Vermeulen, K.J. (author), Bommer, J.D.S. (author), Kouwenhoven, Leo P. (author), Zhang, H. (author)Strong spin–orbit semiconductor nanowires coupled to a superconductor are predicted to host Majorana zero modes. Exchange (braiding) operations of Majorana modes form the logical gates of a topological quantum computer and require a network of nanowires. Here, we utilize an in-plane selective area growth technique for InSb–Al semiconductor...journal article 2020
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Bargerbos, A. (author), Uilhoorn, W. (author), Yang, C. (author), Krogstrup, Peter (author), Kouwenhoven, Leo P. (author), de Lange, G. (author), van Heck, B. (author), Kou, A. (author)Isolation from the environment determines the extent to which charge is confined on an island, which manifests as Coulomb oscillations, such as charge dispersion. We investigate the charge dispersion of a nanowire transmon hosting a quantum dot in the junction. We observe rapid suppression of the charge dispersion with increasing junction...journal article 2020
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Borsoi, F. (author), Zuo, Kun (author), Gazibegovic, Sasa (author), op het Veld, R.L.M. (author), Bakkers, Erik P.A.M. (author), Kouwenhoven, Leo P. (author), Heedt, S. (author)Detecting the transmission phase of a quantum dot via interferometry can reveal the symmetry of the orbitals and details of electron transport. Crucially, interferometry will enable the read-out of topological qubits based on one-dimensional nanowires. However, measuring the transmission phase of a quantum dot in a nanowire has not yet been...journal article 2020
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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