Universal control of a six-qubit quantum processor in silicon

AbstractFuture quantum computers capable of solving relevant problems will require a large number of qubits that can be operated reliably1.

Key Results

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 promise2,3but demonstrations so far use between one and four qubits and typically optimize the fidelity of either single- or two-qubit operations, or initialization and readout4–11.
Here, we increase the number of qubits and simultaneously achieve respectable fidelities for universal operation, state preparation and measurement.