![]() These advances will enable testing of increasingly meaningful quantum protocols and constitute a major stepping stone towards large-scale quantum computers. State preparation combines initialization by measurement and real-time feedback with quantum-non-demolition measurements. We design, fabricate and operate a six-qubit processor with a focus on careful Hamiltonian engineering, on a high level of abstraction to program the quantum circuits, and on efficient background calibration, all of which are essential to achieve high fidelities on this extended system. Here, we increase the number of qubits and simultaneously achieve respectable fidelities for universal operation, state preparation and measurement. ![]() ![]() Spins in semiconductor quantum dots show long-term promise 2, 3 but demonstrations so far use between one and four qubits and typically optimize the fidelity of either single- or two-qubit operations, or initialization and readout 4, 5, 6, 7, 8, 9, 10, 11. However, the requirements of having a large qubit count and operating with high fidelity are typically conflicting. ![]() Future quantum computers capable of solving relevant problems will require a large number of qubits that can be operated reliably 1. ![]()
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