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Reducing charge noise in quantum dots by using thin silicon quantum wells

Paquelet Wuetz, B. (author), Degli Esposti, D. (author), Zwerver, A.M.J. (author), Amitonov, S.V. (author), Botifoll, M. (author), Arbiol, J. (author), Vandersypen, L.M.K. (author), Russ, M. (author), Scappucci, G. (author)

Charge noise in the host semiconductor degrades the performance of spinqubits and poses an obstacle to control large quantumprocessors. 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 buried...

article 2023

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Author correction: Reducing charge noise in quantum dots by using thin silicon quantum wells

Paquelet Wuetz, B. (author), Degli Esposti, D. (author), Zwerver, A.M.J. (author), Amitonov, S.V. (author), Botifoll, M. (author), Jordi, A. (author), Sammak, A. (author), Vandersypen, L.M.K. (author), Russ, M. (author), Scappucci, G. (author)

article 2023

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Measuring DNA modifications with the comet assay: a compendium of protocols

Collins, A. (author), Møller, P. (author), Gajski, G. (author), Vodenková, S. (author), Abdulwahed, A. (author), Anderson, D. (author), Bankoglu, E.E. (author), Bonassi, S. (author), Boutet-Robinet, E. (author), Brunborg, G. (author), Chao, C. (author), Cooke, M.S. (author), Costa, C. (author), Costa, S. (author), Dhawan, A. (author), de Lapuente, J. (author), Bo’, C.D. (author), Dubus, J. (author), Dusinska, M. (author), Duthie, S.J. (author), Yamani, N.E. (author), Engelward, B. (author), Gaivão, I. (author), Giovannelli, L. (author), Godschalk, R. (author), Guilherme, S. (author), Gutzkow, K.B. (author), Habas, K. (author), Hernández, A. (author), Herrero, O. (author), Isidori, M. (author), Jha, A.N. (author), Knasmüller, S. (author), Kooter, I.M. (author), Koppen, G. (author), Kruszewski, M. (author), Ladeira, C. (author), Laffon, B. (author), Larramendy, M. (author), Hégarat, L.L. (author), Lewies, A. (author), Lewinska, A. (author), Liwszyc, G.E. (author), de Cerain, A.L. (author), Manjanatha, M. (author), Marcos, R. (author), Milic, M. (author), de Andrade, V.M. (author), Moretti, M. (author), Muruzabal, D. (author), Novak, M. (author), Oliveira, R. (author), Olsen, A.K. (author), Owiti, N. (author), Pacheco, M. (author), Pandey, A.K. (author), Pfuhler, S. (author), Pourrut, B. (author), Reisinger, K. (author), Rojas, E. (author), Rundén-Pran, E. (author), Sanz-Serrano, J. (author), Shaposhnikov, S. (author), Sipinen, V. (author), Smeets, K. (author), Stopper, H. (author), Teixeira, J.P. (author), Valdiglesias, V. (author), Valverde, M. (author), van Acker, F. (author), van Schooten, F.J. (author), Vasquez, M. (author), Wentzel, J.F. (author), Wnuk, M. (author), Wouters, A. (author), Žegura, B. (author), Zikmund, T. (author), Langie, S.A.S. (author), Azqueta, A. (author)

The comet assay is a versatile method to detect nuclear DNA damage in individual eukaryotic cells, from yeast to human. The types of damage detected encompass DNA strand breaks and alkali-labile sites (e.g., apurinic/apyrimidinic sites), alkylated and oxidized nucleobases, DNA-DNA crosslinks, UV-induced cyclobutane pyrimidine dimers and some...

article 2023

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A touchless user interface based on a near-infrared-sensitive transparent optical imager

Kamijo, T. (author), Breemen, A.J.J.M. (author), Ma, X. (author), Shanmugam, S. (author), Bel, M.G.J. (author), Haas, G.J.A.G.F. (author), Peeters, B. (author), Petre, A.R. (author), Tordera, D. (author), Verbeek, R.G.F.A. (author), Akkerman, H.B. (author), Hagelsieb, L.M. (author), de Roose, F. (author), Lieberman, I. (author), Yamaguchi, F. (author), Janssen, R.A.J. (author), Meulenkamp, E.A. (author), Kronemeijer, A.J. (author), Gelinck, G.H. (author)

Touchless user interfaces that are based on gestures typically rely on near-infrared cameras. However, such systems are often hampered by their limited field of view and high-accuracy calibration requirements. Here we report a touchless user interface that is based on a visually transparent near-infrared-sensitive organic photodetector array and...

article 2023

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Hard superconducting gap in germanium

Tosato, A. (author), Levajac, V. (author), Wang, J.Y. (author), Boor, C.J. (author), Borsoi, F. (author), Botifoll, M. (author), Borja, C.N. (author), Marti-Sánchez, S. (author), Arbiol, J. (author), Sammak, A. (author), Veldhorst, M. (author), Scappucci, G. (author)

The co-integration of spin, superconducting, and topological systems is emerging as an exciting pathway for scalable and high-fidelity quantum information technology. High-mobility planar germanium is a front-runner semiconductor for building quantum processors with spin-qubits, but progress with hybrid superconductor-semiconductor devices is...

article 2023

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Simultaneous single-qubit driving of semiconductor spin qubits at the fault-tolerant threshold

Lawrie, W.I.L. (author), Rimbach-Russ, M. (author), van Riggelen, F. (author), Hendrickz, 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, highfidelity operations above 99.9% have been realized with individual qubits, though their performance has been limited to 98.67%...

article 2023

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The Case for Simple Simulation: Stochastic Market Simulation to Assess Renewable Business Cases

Verstraten, P. (author), van der Weijde, A.H. (author)

Purpose of Review: This paper argues that, for the purpose of determining business cases for renewable energy assets, simple simulation methods can be very valuable. We demonstrate this through the application of a stochastic agent-based energy market model which, instead of a modelling the explicit drivers behind future investments, treats...

article 2023

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Longitudinal Analysis of the Topology of Criminal Networks using a Simple Cost-Benefit Agent-Based Model

Weyland, L.F. (author), Barros, A.I. (author), van der Zwet, K.V. (author)

Recently, efforts have been made in computational criminology to study the dynamics of criminal organisations and improve law enforcement measures. To understand the evolution of a criminal network, current literature uses social network analysis and agent-based modelling as research tools. However, these studies only explain the short-term...

conference paper 2023

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Shared control of a 16 semiconductor quantum dot crossbar array

Borsoi, F. (author), Hendrickx, N.W. (author), John, V. (author), Meyer, M. (author), Motz, S. (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...

article 2023

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Quantum logic with spin qubits crossing the surface code threshold

Xue, X. (author), Russ, M. (author), Samkharadze, N. (author), Undseth, B. (author), Sammak, A. (author), Scappucci, G. (author), Vandersypen, L.M.K. (author)

High-fidelity control of quantum bits is paramount for the reliable execution of quantum algorithms and for achieving fault tolerance—the ability to correct errors faster than they occur. The central requirement for fault tolerance is expressed in terms of an error threshold. Whereas the actual threshold depends on many details, a common target...

article 2022

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Fast universal quantum gate above the fault-tolerance threshold in silicon

Noiri, A. (author), Takeda, K. (author), Nakajima, T. (author), Kobayashi, T. (author), Sammak, A. (author), Scappucci, G. (author), Tarucha, S. (author)

Fault-tolerant quantum computers that can solve hard problems rely on quantum error correction1. One of the most promising error correction codes is the surface code, which requires universal gate fidelities exceeding an error correction threshold of 99%. Among the many qubit platforms, only superconducting circuits, trapped ions and nitrogen...

article 2022

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Towards European standards for quantum technologies

van Deventer, M.O. (author), Spethmann, N. (author), Loeffler, M. (author), Amoretti, M. (author), van den Brink, R. (author), Bruno, N. (author), Comi, P. (author), Farrugia, N. (author), Gramegna, M. (author), Jenet, A. (author), Kassenberg, B. (author), Kozlowski, W. (author), Länger, T. (author), Lindstrom, T. (author), Martin, V. (author), Neumann, N.M.P. (author), Papadopoulos, H. (author), Pascazio, S. (author), Peev, M. (author), Pitwon, R. (author), Adriaan Rol, M. (author), Traina, P. (author), Venderbosch, P. (author), Wilhelm-Mauch, F.K. (author)

The Second Quantum Revolution facilitates the engineering of new classes of sensors, communication technologies, and computers with unprecedented capabilities. Supply chains for quantum technologies are emerging, some focused on commercially available components for enabling technologies and/or quantum-technologies research infrastructures,...

article 2022

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Atomic fluctuations lifting the energy degeneracy in Si/SiGe quantum dots

Paquelet Wuetz, B. (author), Losert, M.P. (author), Koelling, S. (author), Stehouwer, L.E.A. (author), Zwerver, A.M.J. (author), Philips, S.G.J. (author), Madzik, M.T. (author), Xue, X. (author), Zheng, G. (author), Lodari, M. (author), Amitonov, S.V. (author), Samkharadze, N. (author), Sammak, A. (author), Vandersypen, L.M.K. (author), Rahman, R. (author), Coppersmith, S.N. (author), Moutanabbir, O. (author), Friesen, M. (author), Scappucci, G. (author)

Electron spins in Si/SiGe quantum wells suffer from nearly degenerate conduction band valleys, which compete with the spin degree of freedom in the formation of qubits. Despite attempts to enhance the valley energy splitting deterministically, by engineering a sharp interface, valley splitting fluctuations remain a serious problem for qubit...

article 2022

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Universal control of a six-qubit quantum processor in silicon

Philips, S.G.J. (author), Mądzik, M.T. (author), Amitonov, S.V. (author), de Snoo, S.L. (author), Russ, M. (author), Kalhor, N. (author), Volk, C. (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 between...

article 2022

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Dietary change in high-income nations alone can lead to substantial double climate dividend

Sun, Z. (author), Scherer, L. (author), Tukker, A. (author), Spawn-Lee, S.A. (author), Bruckner, M. (author), Gibbs, H.K. (author), Behrens, P. (author)

article 2022

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Using the near field optical trapping effect of a dielectric metasurface to improve SERS enhancement for virus detection

Kenworthy, C.F. (author), Stoevelaar, L.P. (author), Alexander, A.J. (author), Gerini, G. (author)

In this paper, we report the effect of optical trapping on the enhancement factor for Raman spectroscopy, using a dielectric metasurface. It was found that a higher enhancement factor (up to 275%) can be obtained in a substrate immersed in water, where particles are freee to move, compared to a dried substrate, where the particles (radius r = 9...

article 2021

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A four-qubit germanium quantum processor

Hendrickx, N.W. (author), Lawrie, W.I.L. (author), Russ, M. (author), van Riggelen, F. (author), de Snoo, S.L. (author), Schouten, R.N. (author), Sammak, A. (author), Scappucci, G. (author), Veldhorst, M. (author)

The prospect of building quantum circuits using advanced semiconductor manufacturing makes quantum dots an attractive platform for quantum information processing. Extensive studies of various materials have led to demonstrations of two-qubit logic in gallium arsenide, silicon and germanium. However, interconnecting larger numbers of qubits in...

article 2021

document

Met Mast Measurements of wind turbine wakes

Wagenaar, J.W. (author)

This chapter addresses met mast measurements for wind turbine wake research, where we tackle the matter by posing and answering three questions. By asking ourselves what the value is of met mast measurements for wake/aerodynamic research, we describe how met masts can be and have been used in aerodynamic research, accompanied by a number of...

bookPart 2021

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Protocols for minimizing the leading edge bulge in stereolithography

Kozhevnikov, A. (author), Kunnen, R.P.J. (author), van Baars, G.E. (author), Clercx, H.J.H. (author)

The leading edge bulge is a known defect in stereolithography with free-surface recoating. It is a resin excess that remains after deposition over a deep-to-shallow topographic transition, the leading edge of the cavity. In this paper, we explore an approach based on changing the gap between the recoating blade and the previously cured layer to...

article 2021

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Fast two-qubit logic with holes in germanium

Hendrickx, N.W. (author), Franke, D.P. (author), Sammak, A. (author), Scappucci, G. (author), Veldhorst, M. (author)

Universal quantum information processing requires the execution of single-qubit and two-qubit logic. Across all qubit realizations1, spin qubits in quantum dots have great promise to become the central building block for quantum computation2. Excellent quantum dot control can be achieved in gallium arsenide3–5, and high-fidelity qubit rotations...

article 2020