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Volume 601 Issue 7893, 20 January 2022

High fidelity

The cover image shows an artist’s impression of spin qubits, the building blocks of a silicon quantum computer. The two red spheres are atomic nuclei surrounded by the wavefunction of an associated electron (the ellipse). The four ‘lobes’ represent entanglement between the qubits. In this week’s issue, three papers independently present silicon-based quantum-computing platforms that used multiqubit entanglement: one, from Andrea Morello and colleagues, relies on atoms implanted in silicon (shown), the other two, from Lieven Vandersypen and Seigo Tarucha and their respective co-workers, work with electrons in quantum dots. Crucially, all three systems have achieved fidelity in excess of 99%, which means that errors occur less than once every 100 operations. This is a key threshold for error correction that could make quantum computers based on silicon qubits a viable proposition — one that could make ready use of long-established chip manufacturing technologies.

Cover image: Tony Melov

This Week

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  • Article | | Open Access

    A spin-based quantum processor in silicon achieves single-qubit and two-qubit gate fidelities above 99.5% using gate-set tomography, exceeding the theoretical threshold required for fault-tolerant quantum computing.

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  • Article | | Open Access

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