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Philips, S.G.J. (author)Physicist have been entertaining the idea of a quantum computer for quite a while. The theoretical foundations of this idea are well understood and it is clear that certain calculations can be performed significantly faster compared to the classical computer. Consequently, research in quantum computation is seen as a promising and valuable...doctoral thesis 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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Russ, M.F. (author), Philips, S.G.J. (author), Xue, X. (author), Vandersypen, L.M.K. (author)Semiconductor spin qubits demonstrated single-qubit gates with fidelities up to 99.9 % benchmarked in the single-qubit subspace. However, tomographic characterizations reveal non-negligible crosstalk errors in a larger space. Additionally, it was long thought that the two-qubit gate performance is limited by charge noise, which couples to the...journal article 2023
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Paquelet Wuetz, B. (author), Stehouwer, L.E.A. (author), Zwerver, A.M.J. (author), Philips, S.G.J. (author), Xue, X. (author), Zheng, G. (author), Lodari, M. (author), Samkharadze, Nodar (author), Sammak, A. (author), Vandersypen, L.M.K. (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...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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Liu, Y. Y. (author), Philips, S.G.J. (author), Orona, L. A. (author), Samkharadze, Nodar (author), McJunkin, T. (author), Macquarrie, E. R. (author), Eriksson, M. A. (author), Vandersypen, L.M.K. (author), Yacoby, A. (author)Radio-frequency (rf) reflectometry offers a fast and sensitive method for charge sensing and spin readout in gated quantum dots. We focus in this work on the implementation of rf readout in accumulation-mode gate-defined quantum dots, where the large parasitic capacitance poses a challenge. We describe and test two methods for mitigating the...journal article 2021
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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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Watson, T.F. (author), Philips, S.G.J. (author), Kawakami, E. (author), Ward, D. R. (author), Scarlino, P. (author), Veldhorst, M. (author), Savage, D. E. (author), Lagally, M. G. (author), Friesen, Mark (author), Coppersmith, S. N. (author), Eriksson, M.A. (author), Vandersypen, L.M.K. (author)Now that it is possible to achieve measurement and control fidelities for individual quantum bits (qubits) above the threshold for fault tolerance, attention is moving towards the difficult task of scaling up the number of physical qubits to the large numbers that are needed for fault-tolerant quantum computing. In this context, quantum-dot...journal article 2018