Searched for: author%3A%22Vandersypen%2C+L.M.K.%22
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van Diepen, C.J. (author), Hsiao, T. (author), Mukhopadhyay, U. (author), Reichl, Christian (author), Wegscheider, Werner (author), Vandersypen, L.M.K. (author)
The spin of a single electron in a semiconductor quantum dot provides a well-controlled and long-lived qubit implementation. The electron charge in turn allows control of the position of individual electrons in a quantum dot array, and enables charge sensors to probe the charge configuration. Here we show that the Coulomb repulsion allows an...
journal article 2021
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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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Prabowo, B. (author), Zheng, G. (author), Mehrpoo, M. (author), Patra, B (author), Harvey-Collard, P. (author), Dijkema, J.J. (author), Sammak, Amir (author), Scappucci, G. (author), Charbon-Iwasaki-Charbon, E. (author), Sebastiano, F. (author), Vandersypen, L.M.K. (author), Babaie, M. (author)
Quantum computers (QC) promise to solve certain computational problems exponentially faster than a classical computer due to the superposition and entanglement properties of quantum bits (qubits). Among several qubit technologies, spin qubits are a promising candidate for large-scale QC, since (1) they have a small footprint allowing them to...
conference paper 2021
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Harvey-Collard, P. (author), Zheng, G. (author), Dijkema, J.J. (author), Samkharadze, Nodar (author), Sammak, A. (author), Scappucci, G. (author), Vandersypen, L.M.K. (author)
Circuit quantum electrodynamics (QED) employs superconducting microwave resonators as quantum buses. In circuit QED with semiconductor quantum-dot-based qubits, increasing the resonator impedance is desirable as it enhances the coupling to the typically small charge dipole moment of these qubits. However, the gate electrodes necessary to form...
journal article 2020
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Hsiao, T. (author), van Diepen, C.J. (author), Mukhopadhyay, U. (author), Reichl, C. (author), Wegscheider, W. (author), Vandersypen, L.M.K. (author)
Electrostatically-defined semiconductor quantum dot arrays offer a promising platform for quantum computation and quantum simulation. However, crosstalk of gate voltages to dot potentials and interdot tunnel couplings complicates the tuning of the device parameters. To date, crosstalk to the dot potentials is routinely and efficiently...
journal article 2020
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Boter, J.M. (author), Xue, X. (author), Krähenmann, T.S. (author), Watson, T.F. (author), Premakumar, Vickram N. (author), Ward, Daniel R. (author), Savage, Donald E. (author), Eriksson, Mark A. (author), Vandersypen, L.M.K. (author)
We study spatial noise correlations in a Si/SiGe two-qubit device with integrated micromagnets. Our method relies on the concept of decoherence-free subspaces, whereby we measure the coherence time for two different Bell states, designed to be sensitive only to either correlated or anticorrelated noise, respectively. From these measurements...
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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Xue, X. (author), D'anjou, Benjamin (author), Watson, T.F. (author), Ward, Daniel R. (author), Savage, Donald E. (author), Lagally, Max G. (author), Friesen, Mark (author), Eriksson, Mark A. (author), Vandersypen, L.M.K. (author)
Quantum error correction is of crucial importance for fault-tolerant quantum computers. As an essential step toward the implementation of quantum error-correcting codes, quantum nondemolition measurements are needed to efficiently detect the state of a logical qubit without destroying it. Here we implement quantum nondemolition measurements...
journal article 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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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), 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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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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Dehollain Lorenzana, J.P. (author), Mukhopadhyay, U. (author), Michal, V.P. (author), Wang, Y. (author), Wunsch, B. (author), Reichl, C. (author), Wegscheider, W. (author), Rudner, M. S. (author), Demler, E. (author), Vandersypen, L.M.K. (author)
Engineered, highly controllable quantum systems are promising simulators of emergent physics beyond the simulation capabilities of classical computers<sup>1</sup>. An important problem in many-body physics is itinerant magnetism, which originates purely from long-range interactions of free electrons and whose existence in real systems has...
journal article 2020
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Vermaas, P.E. (author), Nas, D.N. (author), Vandersypen, L.M.K. (author), Elkouss Coronas, D. (author)
Emerging quantum technologies will impact industry and society at large, but how and to what extent we do not know yet. That is why a TU Delft Quantum Vision team set about exploring this impact, with a special focus on quantum internet as the first technology that is likely to become reality.
report 2019
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Sabbagh, D. (author), Massa, L. (author), Amitonov, S. (author), Boter, J.M. (author), Droulers, G. (author), Eenink, H.G.J. (author), Veldhorst, M. (author), Vandersypen, L.M.K. (author), Scappucci, G. (author)
We investigate the structural and quantum transport properties of isotopically enriched Si28/SiO228 stacks deposited on 300-mm Si wafers in an industrial CMOS fab. Highly uniform films are obtained with an isotopic purity greater than 99.92%. Hall-bar transistors with an oxide stack comprising 10 nm of Si28O2 and 17 nm of Al2O3 (equivalent...
journal article 2019
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Eenink, H.G.J. (author), Petit, L. (author), Lawrie, W.I.L. (author), Clarke, J. S. (author), Vandersypen, L.M.K. (author), Veldhorst, M. (author)
Extremely long coherence times, excellent single-qubit gate fidelities, and two-qubit logic have been demonstrated with silicon metal-oxide-semiconductor spin qubits, making it one of the leading platforms for quantum information processing. Despite this, a long-standing challenge in this system has been the demonstration of tunable tunnel...
journal article 2019
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Helsen, J. (author), Xue, X. (author), Vandersypen, L.M.K. (author), Wehner, S.D.C. (author)
Randomized benchmarking is a technique for estimating the average fidelity of a set of quantum gates. However, if this gateset is not the multi-qubit Clifford group, robustly extracting the average fidelity is difficult. Here, we propose a new method based on representation theory that has little experimental overhead and robustly extracts...
journal article 2019
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Schuetz, M. J.A. (author), Vermersch, B. (author), Kirchmair, G. (author), Vandersypen, L.M.K. (author), Cirac, J. I. (author), Lukin, M. D. (author), Zoller, P. (author)
We propose a setup based on (solid-state) qubits coupled to a common multimode transmission line, which allows for coherent spin-spin interactions over macroscopic on-chip distances, without any ground-state cooling requirements for the data bus. Our approach allows for the realization of fast deterministic nonlocal quantum gates, the...
journal article 2019
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Xue, X. (author), Watson, T.F. (author), Helsen, J. (author), Ward, D. R. (author), Savage, D. E. (author), Lagally, M. G. (author), Coppersmith, S. N. (author), Eriksson, M. A. (author), Wehner, S.D.C. (author), Vandersypen, L.M.K. (author)
We report the first complete characterization of single-qubit and two-qubit gate fidelities in silicon-based spin qubits, including cross talk and error correlations between the two qubits. To do so, we use a combination of standard randomized benchmarking and a recently introduced method called character randomized benchmarking, which allows...
journal article 2019
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Wang, Yao (author), Dehollain, Juan Pablo (author), Liu, Fang (author), Mukhopadhyay, U. (author), Rudner, Mark S. (author), Vandersypen, L.M.K. (author), Demler, Eugene (author)
Recent progress of quantum simulators provides insight into the fundamental problems of strongly correlated systems. To adequately assess the accuracy of these simulators, the precise modeling of the many-body physics, with accurate model parameters, is crucially important. In this paper, we employed an ab initio exact diagonalization...
journal article 2019
Searched for: author%3A%22Vandersypen%2C+L.M.K.%22
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