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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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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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Zwerver, A.M.J. (author), Krähenmann, T.S. (author), Amitonov, S. (author), Boter, J.M. (author), Droulers, G. (author), Lodari, M. (author), Samkharadze, Nodar (author), Zheng, G. (author), Scappucci, G. (author), Veldhorst, M. (author), Vandersypen, L.M.K. (author)Full-scale quantum computers require the integration of millions of qubits, and the potential of using industrial semiconductor manufacturing to meet this need has driven the development of quantum computing in silicon quantum dots. However, fabrication has so far relied on electron-beam lithography and, with a few exceptions, conventional...journal article 2022
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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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Xue, X. (author), Russ, M.F. (author), Samkharadze, Nodar (author), Undseth, B.W. (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<sup>1</sup>. The central requirement for fault tolerance is expressed in terms of an error threshold. Whereas the actual threshold depends on many details, a...journal article 2022
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Verberk, Rogier (author), Michalak, D.J. (author), Versluis, R. (author), Polinder, H. (author), Samkharadze, Nodar (author), Amitonov, S. (author), Sammak, A. (author), Tryputen, L. (author), Brousse, D. (author), Hanfoug, R. (author)As part of the National Agenda for Quantum Technology, QuTech (TU Delft and TNO) has agreed to make quantum technology accessible to society and industry via its full-stack prototype: Quantum Inspire. This system includes two different types of programmable quantum chips: circuits made from superconducting materials (transmons), and circuits...conference paper 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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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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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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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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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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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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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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THOMAS, N.E. (author), Watson, T.F. (author), Metz, M. (author), Boter, J.M. (author), Dehollain Lorenzana, J.P. (author), Droulers, G. (author), Eenink, H.G.J. (author), Li, R. (author), Massa, L. (author), Sabbagh, D. (author), Samkharadze, Nodar (author), Volk, C.A. (author), Zwerver, A.M.J. (author), Veldhorst, M. (author), Scappucci, G. (author), Vandersypen, L.M.K. (author)Quantum computing's value proposition of an exponential speedup in computing power for certain applications has propelled a vast array of research across the globe. While several different physical implementations of device level qubits are being investigated, semiconductor spin qubits have many similarities to scaled transistors. In this...conference paper 2019
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Zheng, G. (author), Samkharadze, Nodar (author), Noordam, M.L. (author), Kalhor, N. (author), Brousse, D. (author), Sammak, A. (author), Scappucci, G. (author), Vandersypen, L.M.K. (author)Silicon spin qubits are one of the leading platforms for quantum computation<sup>1,2</sup>. As with any qubit implementation, a crucial requirement is the ability to measure individual quantum states rapidly and with high fidelity. Since the signal from a single electron spin is minute, the different spin states are converted to different...journal article 2019
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Zheng, G. (author), Samkharadze, Nodar (author), Noordam, M.L. (author), Kalhor, N. (author), Brousse, D. (author), Sammak, A. (author), Mendes, U. C. (author), Blais, A. (author), Scappucci, G. (author), Vandersypen, L.M.K. (author)We demonstrate the strong coupling between a single electron spin in silicon and a single photon in a superconducting microwave cavity. Using the same cavity we perform rapid high-fidelity single-shot readout of two-electron spin states.conference paper 2019
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Schreiber, K. A. (author), Samkharadze, Nodar (author), Gardner, G. C. (author), Lyanda-Geller, Y. (author), Manfra, M. J. (author), Pfeiffer, L. N. (author), West, K. W. (author), Csáthy, G. A. (author)In spite of its ubiquity in strongly correlated systems, the competition of paired and nematic ground states remains poorly understood. Recently such a competition was reported in the two-dimensional electron gas at filling factor ν = 5/2. At this filling factor a pressure-induced quantum phase transition was observed from the paired...journal article 2018
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Samkharadze, Nodar (author), Zheng, G. (author), Kalhor, N. (author), Brousse, D. (author), Sammak, A. (author), Mendes, U. C. (author), Blais, A. (author), Scappucci, G. (author), Vandersypen, L.M.K. (author)Long coherence times of single spins in silicon quantum dots make these systems highly attractive for quantum computation, but how to scale up spin qubit systems remains an open question. As a first step to address this issue, we demonstrate the strong coupling of a single electron spin and a single microwave photon. The electron spin is...journal article 2018
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- Xue, X. (author), Corna, A. (author), Samkharadze, Nodar (author), Veldhorst, M. (author), Ishihara, R. (author), Vandersypen, L.M.K. (author) abstract 2018
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Samkharadze, Nodar (author), Bruno, A. (author), Scarlino, P. (author), Zheng, G. (author), Divincenzo, D.P. (author), DiCarlo, L. (author), Vandersypen, L.M.K. (author)We present superconducting microwave-frequency resonators based on NbTiN nanowires. The small cross section of the nanowires minimizes vortex generation, making the resonators resilient to magnetic fields. Measured intrinsic quality factors exceed 2×105 in a 6-T in-plane magnetic field and 3×104 in a 350-mT perpendicular magnetic field....journal article 2016