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John, V. (author), Borsoi, F. (author), György, Zoltán (author), Wang, C.A. (author), Széchenyi, Gábor (author), van Riggelen, F. (author), Lawrie, W.I.L. (author), Hendrickx, N.W. (author), Sammak, A. (author), Scappucci, G. (author), Pályi, András (author), Veldhorst, M. (author)Electrically driven spin resonance is a powerful technique for controlling semiconductor spin qubits. However, it faces challenges in qubit addressability and off-resonance driving in larger systems. We demonstrate coherent bichromatic Rabi control of quantum dot hole spin qubits, offering a spatially selective approach for large qubit arrays...journal article 2024
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Wu, Yi Hsien (author), Camenzind, Leon C. (author), Noiri, Akito (author), Takeda, Kenta (author), Nakajima, Takashi (author), Kobayashi, Takashi (author), Chang, Chien Yuan (author), Sammak, A. (author), Scappucci, G. (author), Tarucha, Seigo (author)Because of their long coherence time and compatibility with industrial foundry processes, electron spin qubits are a promising platform for scalable quantum processors. A full-fledged quantum computer will need quantum error correction, which requires high-fidelity quantum gates. Analyzing and mitigating gate errors are useful to improve gate...journal article 2024
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Degli Esposti, D. (author), Stehouwer, L.E.A. (author), Gül, Önder (author), Samkharadze, Nodar (author), Déprez, C.C. (author), Meyer, M. (author), Meijer, Ilja N. (author), Tryputen, L. (author), Karwal, S. (author), Vandersypen, L.M.K. (author), Sammak, A. (author), Veldhorst, M. (author), Scappucci, G. (author)The electrical characterisation of classical and quantum devices is a critical step in the development cycle of heterogeneous material stacks for semiconductor spin qubits. In the case of silicon, properties such as disorder and energy separation of conduction band valleys are commonly investigated individually upon modifications in selected...journal article 2024
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Prabowo, B. (author), Pietx i Casas, O. (author), Montazerolghaem, M.A. (author), Scappucci, G. (author), Vandersypen, L.M.K. (author), Sebastiano, F. (author), Babaie, M. (author)Continuous rounds of quantum error correction (QEC) are essential to achieve faulttolerant quantum computers (QCs). In each QEC cycle, thousands of ancilla quantum bits (qubits) must be read out faster than the qubits' decoherence time (<<T2∗~120μs for spin qubits). To address this urgent need, several CMOS receivers operating at...conference paper 2024
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Hsiao, T. (author), Cova Fariña, P. (author), Oosterhout, S.D. (author), Jirovec, D. (author), Zhang, X. (author), van Diepen, C.J. (author), Lawrie, W.I.L. (author), Wang, C.A. (author), Sammak, A. (author), Scappucci, G. (author), Veldhorst, M. (author), Vandersypen, L.M.K. (author)Quantum systems with engineered Hamiltonians can be used to study many-body physics problems to provide insights beyond the capabilities of classical computers. Semiconductor gate-defined quantum dot arrays have emerged as a versatile platform for realizing generalized Fermi-Hubbard physics, one of the richest playgrounds in condensed matter...journal article 2024
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Takeda, Kenta (author), Noiri, Akito (author), Nakajima, Takashi (author), Camenzind, Leon C. (author), Kobayashi, Takashi (author), Sammak, A. (author), Scappucci, G. (author), Tarucha, Seigo (author)Silicon-based spin qubits offer a potential pathway toward realizing a scalable quantum computer owing to their compatibility with semiconductor manufacturing technologies. Recent experiments in this system have demonstrated crucial technologies, including high-fidelity quantum gates and multiqubit operation. However, the realization of a...journal article 2024
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Undseth, B.W. (author), Xue, X. (author), Mehmandoost, M. (author), Rimbach-Russ, Maximilian (author), Eendebak, P.T. (author), Samkharadze, Nodar (author), Sammak, A. (author), Dobrovitski, V.V. (author), Scappucci, G. (author), Vandersypen, L.M.K. (author)Micromagnet-based electric dipole spin resonance offers an attractive path for the near-term scaling of dense arrays of silicon spin qubits in gate-defined quantum dots while maintaining long coherence times and high control fidelities. However, accurately controlling dense arrays of qubits using a multiplexed drive will require an...journal article 2023
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Borsoi, F. (author), Hendrickx, N.W. (author), John, V. (author), Meyer, M. (author), Motz, Sayr (author), van Riggelen, F. (author), Sammak, A. (author), de Snoo, S.L. (author), Scappucci, G. (author), Veldhorst, M. (author)The efficient control of a large number of qubits is one of the most challenging aspects for practical quantum computing. Current approaches in solid-state quantum technology are based on brute-force methods, where each and every qubit requires at least one unique control line—an approach that will become unsustainable when scaling to the...journal article 2023
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Meyer, M. (author), Déprez, C.C. (author), Meijer, Ilja N. (author), Unseld, F.K. (author), Karwal, S. (author), Sammak, A. (author), Scappucci, G. (author), Vandersypen, L.M.K. (author), Veldhorst, M. (author)The small footprint of semiconductor qubits is favorable for scalable quantum computing. However, their size also makes them sensitive to their local environment and variations in the gate structure. Currently, each device requires tailored gate voltages to confine a single charge per quantum dot, clearly challenging scalability. Here, we...journal article 2023
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Unseld, F.K. (author), Meyer, M. (author), Madzik, M.T. (author), Borsoi, F. (author), de Snoo, S.L. (author), Amitonov, S. (author), Sammak, A. (author), Scappucci, G. (author), Veldhorst, M. (author), Vandersypen, L.M.K. (author)Semiconductor spin qubits have gained increasing attention as a possible platform to host a fault-tolerant quantum computer. First demonstrations of spin qubit arrays have been shown in a wide variety of semiconductor materials. The highest performance for spin qubit logic has been realized in silicon, but scaling silicon quantum dot arrays...journal article 2023
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Lawrie, W.I.L. (author), Russ, M.F. (author), van Riggelen, F. (author), Hendrickx, N.W. (author), de Snoo, S.L. (author), Sammak, A. (author), Scappucci, G. (author), Helsen, J. (author), Veldhorst, M. (author)Practical Quantum computing hinges on the ability to control large numbers of qubits with high fidelity. Quantum dots define a promising platform due to their compatibility with semiconductor manufacturing. Moreover, high-fidelity operations above 99.9% have been realized with individual qubits, though their performance has been limited to 98...journal article 2023
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Wang, C.A. (author), Déprez, C.C. (author), Tidjani, H. (author), Lawrie, W.I.L. (author), Hendrickx, N.W. (author), Sammak, A. (author), Scappucci, G. (author), Veldhorst, M. (author)Simulations using highly tunable quantum systems may enable investigations of condensed matter systems beyond the capabilities of classical computers. Quantum dots and donors in semiconductor technology define a natural approach to implement quantum simulation. Several material platforms have been used to study interacting charge states,...journal article 2023
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Zwerver, A.M.J. (author), Amitonov, S. (author), de Snoo, S.L. (author), Madzik, M.T. (author), Russ, M.F. (author), Sammak, A. (author), Scappucci, G. (author), Vandersypen, L.M.K. (author)Coherent links between qubits separated by tens of micrometers are expected to facilitate scalable quantum computing architectures for spin qubits in electrically defined quantum dots. These links create space for classical on-chip control electronics between qubit arrays, which can help to alleviate the so-called wiring bottleneck. A...journal article 2023
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Stehouwer, L.E.A. (author), Tosato, A. (author), Degli Esposti, D. (author), Costa, D.C. (author), Veldhorst, M. (author), Sammak, A. (author), Scappucci, G. (author)We grow strained Ge/SiGe heterostructures by reduced-pressure chemical vapor deposition on 100 mm Ge wafers. The use of Ge wafers as substrates for epitaxy enables high-quality Ge-rich SiGe strain-relaxed buffers with a threading dislocation density of ( 6 ± 1 ) × 10 5 cm − 2 , nearly an order of magnitude improvement compared to control...journal article 2023
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Losert, Merritt P. (author), Eriksson, M. A. (author), Joynt, Robert (author), Rahman, Rajib (author), Scappucci, G. (author), Coppersmith, Susan N. (author), Friesen, Mark (author)Silicon/silicon-germanium heterostructures have many important advantages for hosting spin qubits. However, controlling the valley splitting (the energy splitting between the two low-lying conduction-band valleys) remains a critical challenge for ensuring qubit reliability. Broad distributions of valley splittings are commonplace, even among...journal article 2023
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Paquelet Wuetz, B. (author), Degli Esposti, D. (author), Zwerver, A.M.J. (author), Amitonov, S. (author), Botifoll, Marc (author), Arbiol, Jordi (author), Sammak, A. (author), Vandersypen, L.M.K. (author), Russ, M.F. (author), Scappucci, G. (author)Charge noise in the host semiconductor degrades the performance of spin-qubits and poses an obstacle to control large quantum processors. However, it is challenging to engineer the heterogeneous material stack of gate-defined quantum dots to improve charge noise systematically. Here, we address the semiconductor-dielectric interface and the...journal article 2023
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Undseth, B.W. (author), Pietx i Casas, O. (author), Raymenants, E.R. (author), Mehmandoost, M. (author), Madzik, M.T. (author), Philips, S.G.J. (author), de Snoo, S.L. (author), Michalak, D.J. (author), Amitonov, S. (author), Tryputen, L. (author), Paquelet Wuetz, B. (author), Fezzi, V. (author), Degli Esposti, D. (author), Sammak, A. (author), Scappucci, G. (author), Vandersypen, L.M.K. (author)As spin-based quantum processors grow in size and complexity, maintaining high fidelities and minimizing crosstalk will be essential for the successful implementation of quantum algorithms and error-correction protocols. In particular, recent experiments have highlighted pernicious transient qubit frequency shifts associated with microwave...journal article 2023
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Rojas-Arias, J. S. (author), Noiri, A. (author), Stano, P. (author), Nakajima, T. (author), Yoneda, J. (author), Takeda, K. (author), Kobayashi, T. (author), Sammak, A. (author), Scappucci, G. (author)We detect correlations in qubit-energy fluctuations of non-neighboring qubits defined in isotopically purified Si/Si-Ge quantum dots. At low frequencies (where the noise is strongest), the correlation coefficient reaches 10% for a next-nearest-neighbor qubit-pair separated by 200 nm. Correlations with the charge-sensor signal reach up to 70%,...journal article 2023
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Tidjani, H. (author), Tosato, A. (author), Ivlev, A.S. (author), Déprez, C.C. (author), Oosterhout, S.D. (author), Stehouwer, L.E.A. (author), Sammak, A. (author), Scappucci, G. (author), Veldhorst, M. (author)Gate-defined quantum dots in silicon-germanium heterostructures have become a compelling platform for quantum computation and simulation. Thus far, developments have been limited to quantum dots defined in a single plane. Here, we propose to advance beyond planar systems by exploiting heterostructures with multiple quantum wells. We...journal article 2023
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Corley-Wiciak, Cedric (author), Richter, Carsten (author), Zoellner, Marvin H. (author), Zaitsev, Ignatii (author), Manganelli, Costanza L. (author), Hendrickx, N.W. (author), Sammak, A. (author), Veldhorst, M. (author), Scappucci, G. (author)A strained Ge quantum well, grown on a SiGe/Si virtual substrate and hosting two electrostatically defined hole spin qubits, is nondestructively investigated by synchrotron-based scanning X-ray diffraction microscopy to determine all its Bravais lattice parameters. This allows rendering the three-dimensional spatial dependence of the six...journal article 2023