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van Riggelen, F. (author), Lawrie, W.I.L. (author), Russ, M.F. (author), Hendrickx, N.W. (author), Sammak, A. (author), Rispler, M.R.R. (author), Terhal, B.M. (author), Scappucci, G. (author), Veldhorst, M. (author)The fault-tolerant operation of logical qubits is an important requirement for realizing a universal quantum computer. Spin qubits based on quantum dots have great potential to be scaled to large numbers because of their compatibility with standard semiconductor manufacturing. Here, we show that a quantum error correction code can be...journal article 2022
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Petit, L. (author), Russ, M.F. (author), Eenink, H.G.J. (author), Lawrie, W.I.L. (author), Clarke, James S. (author), Vandersypen, L.M.K. (author), Veldhorst, M. (author)Spin qubits in quantum dots define an attractive platform for quantum information because of their compatibility with semiconductor manufacturing, their long coherence times, and the ability to operate above one Kelvin. However, despite demonstrations of SWAP oscillations, the integration of this two-qubit gate together with single-qubit...journal article 2022
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Philips, S.G.J. (author), Madzik, M.T. (author), Amitonov, S. (author), de Snoo, S.L. (author), Russ, M.F. (author), Kalhor, N. (author), Volk, C.A. (author), Lawrie, W.I.L. (author), Brousse, D. (author), Tryputen, L. (author), Paquelet Wuetz, B. (author), Sammak, A. (author), Veldhorst, M. (author), Scappucci, G. (author), Vandersypen, L.M.K. (author)Future quantum computers capable of solving relevant problems will require a large number of qubits that can be operated reliably1. However, the requirements of having a large qubit count and operating with high fidelity are typically conflicting. Spins in semiconductor quantum dots show long-term promise2,3 but demonstrations so far use...journal article 2022
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Lodari, M. (author), Hendrickx, N.W. (author), Lawrie, W.I.L. (author), Hsiao, T. (author), Vandersypen, L.M.K. (author), Sammak, A. (author), Veldhorst, M. (author), Scappucci, G. (author)We engineer planar Ge/SiGe heterostructures for low disorder and quiet hole quantum dot operation by positioning the strained Ge channel 55 nm below the semiconductor/dielectric interface. In heterostructure field effect transistors, we measure a percolation density for two-dimensional hole transport of 2.1 × 10 10 cm−2 , indicative of a very...journal article 2021
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Aggarwal, Kushagra (author), Hofmann, Andrea (author), Jirovec, Daniel (author), Prieto, Ivan (author), Sammak, A. (author), Botifoll, Marc (author), Martí-Sánchez, Sara (author), Veldhorst, M. (author), Scappucci, G. (author)Hole gases in planar germanium can have high mobilities in combination with strong spin-orbit interaction and electrically tunable g factors, and are therefore emerging as a promising platform for creating hybrid superconductor-semiconductor devices. A key challenge towards hybrid Ge-based quantum technologies is the design of high-quality...journal article 2021
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Rossi, Alessandro (author), Hendrickx, N.W. (author), Sammak, A. (author), Veldhorst, M. (author), Scappucci, G. (author), Kataoka, Masaya (author)Single-charge pumps are the main candidates for quantum-based standards of the unit ampere because they can generate accurate and quantized electric currents. In order to approach the metrological requirements in terms of both accuracy and speed of operation, in the past decade there has been a focus on semiconductor-based devices. The use of...journal article 2021
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Liles, S. D. (author), Martins, F. (author), Miserev, D. S. (author), Kiselev, A. (author), Thorvaldson, I. D. (author), Rendell, M. J. (author), Jin, I. K. (author), Hudson, F. E. (author), Veldhorst, M. (author)Single holes confined in semiconductor quantum dots are a promising platform for spin-qubit technology, due to the electrical tunability of the g factor of holes. However, the underlying mechanisms that enable electric spin control remain unclear due to the complexity of hole-spin states. Here, we study the underlying hole-spin physics of the...journal article 2021
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Xue, X. (author), Patra, B (author), van Dijk, J.P.G. (author), Samkharadze, Nodar (author), Corna, A. (author), Paquelet Wuetz, B. (author), Sammak, A. (author), Scappucci, G. (author), Veldhorst, M. (author), Sebastiano, F. (author), Babaie, M. (author), Charbon-Iwasaki-Charbon, E. (author), Vandersypen, L.M.K. (author)The most promising quantum algorithms require quantum processors that host millions of quantum bits when targeting practical applications<sup>1</sup>. A key challenge towards large-scale quantum computation is the interconnect complexity. In current solid-state qubit implementations, an important interconnect bottleneck appears between the...journal article 2021
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van Riggelen, F. (author), Hendrickx, N.W. (author), Lawrie, W.I.L. (author), Russ, M.F. (author), Sammak, A. (author), Scappucci, G. (author), Veldhorst, M. (author)Quantum dots fabricated using methods compatible with semiconductor manufacturing are promising for quantum information processing. In order to fully utilize the potential of this platform, scaling quantum dot arrays along two dimensions is a key step. Here, we demonstrate a two-dimensional quantum dot array where each quantum dot is tuned to...journal article 2021
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Patra, B (author), van Dijk, J.P.G. (author), Corna, A. (author), Xue, X. (author), Samkharadze, Nodar (author), Sammak, A. (author), Scappucci, G. (author), Veldhorst, M. (author), Vandersypen, L.M.K. (author), Babaie, M. (author), Sebastiano, F. (author), Charbon-Iwasaki-Charbon, E. (author)Quantum computers (QC), comprising qubits and a classical controller, can provide exponential speed-up in solving certain problems. Among solid-state qubits, transmons and spin-qubits are the most promising, operating « 1K. A qubit can be implemented in a physical system with two distinct energy levels representing the |0) and |1) states, e.g...conference paper 2020
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Lawrie, W.I.L. (author), Eenink, H.G.J. (author), Hendrickx, N.W. (author), Boter, J.M. (author), Petit, L. (author), Amitonov, S. (author), Lodari, M. (author), Paquelet Wuetz, B. (author), Volk, C.A. (author), Philips, S.G.J. (author), Droulers, G. (author), Kalhor, N. (author), van Riggelen, F. (author), Brousse, D. (author), Sammak, A. (author), Vandersypen, L.M.K. (author), Scappucci, G. (author), Veldhorst, M. (author)Electrons and holes confined in quantum dots define excellent building blocks for quantum emergence, simulation, and computation. Silicon and germanium are compatible with standard semiconductor manufacturing and contain stable isotopes with zero nuclear spin, thereby serving as excellent hosts for spins with long quantum coherence. Here, we...review 2020
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Hendrickx, N.W. (author), Lawrie, W.I.L. (author), Petit, L. (author), Sammak, A. (author), Scappucci, G. (author), Veldhorst, M. (author)Qubits based on quantum dots have excellent prospects for scalable quantum technology due to their compatibility with standard semiconductor manufacturing. While early research focused on the simpler electron system, recent demonstrations using multi-hole quantum dots illustrated the favourable properties holes can offer for fast and scalable...journal article 2020
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Paquelet Wuetz, B. (author), Bavdaz, P.L. (author), Yeoh, L.A. (author), Schouten, R.N. (author), van der Does, C.H. (author), Tiggelman, M.J. (author), Sabbagh, D. (author), Sammak, A. (author), Almudever, Carmen G. (author), Sebastiano, F. (author), Clarke, J. S. (author), Veldhorst, M. (author), Scappucci, G. (author)Continuing advancements in quantum information processing have caused a paradigm shift from research mainly focused on testing the reality of quantum mechanics to engineering qubit devices with numbers required for practical quantum computation. One of the major challenges in scaling toward large-scale solid-state systems is the limited input...journal article 2020
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XU, Y. (author), Unseld, F.K. (author), Corna, A. (author), Zwerver, A.M.J. (author), Sammak, A. (author), Brousse, D. (author), Samkharadze, Nodar (author), Amitonov, S. (author), Veldhorst, M. (author), Scappucci, G. (author), Ishihara, R. (author), Vandersypen, L.M.K. (author)Solid-state qubits integrated on semiconductor substrates currently require at least one wire from every qubit to the control electronics, leading to a so-called wiring bottleneck for scaling. Demultiplexing via on-chip circuitry offers an effective strategy to overcome this bottleneck. In the case of gate-defined quantum dot arrays, specific...journal article 2020
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Lawrie, W.I.L. (author), Hendrickx, N.W. (author), van Riggelen, F. (author), Russ, M.F. (author), Petit, L. (author), Sammak, A. (author), Scappucci, G. (author), Veldhorst, M. (author)We investigate hole spin relaxation in the single- and multihole regime in a 2 × 2 germanium quantum dot array. We find spin relaxation times T1 as high as 32 and 1.2 ms for quantum dots with single- and five-hole occupations, respectively, setting benchmarks for spin relaxation times for hole quantum dots. Furthermore, we investigate qubit...journal article 2020
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Van DIjk, Jeroen Petrus Gerardus (author), Patra, B (author), Xue, X. (author), Samkharadze, Nodar (author), Corna, A. (author), Sammak, A. (author), Scappucci, G. (author), Veldhorst, M. (author), Vandersypen, L.M.K. (author), Charbon-Iwasaki-Charbon, E. (author), Babaie, M. (author), Sebastiano, F. (author)Building a large-scale quantum computer requires the co-optimization of both the quantum bits (qubits) and their control electronics. By operating the CMOS control circuits at cryogenic temperatures (cryo-CMOS), and hence in close proximity to the cryogenic solid-state qubits, a compact quantum-computing system can be achieved, thus promising...journal article 2020
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Paquelet Wuetz, B. (author), Losert, Merritt P. (author), Tosato, A. (author), Lodari, M. (author), Bavdaz, P.L. (author), Stehouwer, Lucas (author), Sammak, A. (author), Veldhorst, M. (author), Scappucci, G. (author)We determine the energy splitting of the conduction-band valleys in two-dimensional electrons confined to low-disorder Si quantum wells. We probe the valley splitting dependence on both perpendicular magnetic field B and Hall density by performing activation energy measurements in the quantum Hall regime over a large range of filling factors....journal article 2020
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Last, T. (author), Samkharadze, Nodar (author), Eendebak, P.T. (author), Versluis, R. (author), Xue, X. (author), Sammak, A. (author), Brousse, D. (author), Loh, K.K.L. (author), Polinder, H. (author), Scappucci, G. (author), Veldhorst, M. (author), Vandersypen, L.M.K. (author), Maturova, K. (author), Veltin, J. (author), Alberts, G.J.N. (author)The mission of QuTech is to bring quantum technology to industry and society by translating fundamental scientific research into applied research. To this end we are developing Quantum Inspire (QI), a full-stack quantum computer prototype for future co-development and collaborative R&D in quantum computing. A prerelease of this prototype...conference paper 2020
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Sebastiano, F. (author), van Dijk, J.P.G. (author), Thart, P. A. (author), Patra, B (author), van Staveren, J. (author), Xue, X. (author), Almudever, Carmen G. (author), Scappucci, G. (author), Veldhorst, M. (author), Vandersypen, L.M.K. (author), Vladimirescu, A. (author), Babaie, M. (author), Charbon-Iwasaki-Charbon, E. (author)Cryogenic CMOS (cryo-CMOS) is a viable technology for the control interface of the large-scale quantum computers able to address non-trivial problems. In this paper, we demonstrate state-of-the-art cryo-CMOS circuits and systems for such application and we discuss the challenges still to be faced on the path towards practical quantum...conference paper 2020
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Boter, J.M. (author), Dehollain Lorenzana, J.P. (author), van Dijk, J.P.G. (author), Hensgens, T. (author), Versluis, R. (author), Clarke, J. S. (author), Veldhorst, M. (author), Sebastiano, F. (author), Vandersypen, L.M.K. (author)Current implementations of quantum computers suffer from large numbers of control lines per qubit, becoming unmanageable with system scale up. Here, we discuss a sparse spin-qubit architecture featuring integrated control electronics significantly reducing the off-chip wire count. This quantum-classical hardware integration closes the...conference paper 2019