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Volume 571 Issue 7765, 18 July 2019

Quantum logic

Qubits based on the electron spin of phosphorus atoms show huge promise as a platform for quantum computing. To create logic gates — the building blocks of a processor — the electron spins are placed extremely close together enabling strong interactions and fast gate operation times. Although entanglement has been achieved in silicon quantum dots, it has proved elusive for interactions between two electrons bound to atom qubits. In this issue, Michelle Simmons and her collaborators report a nanosecond two-qubit exchange gate in silicon between electrons on phosphorus donor atoms. The researchers achieved this by engineering qubit placement and its associated control circuitry at the atomic scale to attain high-fidelity readout of the spin states. The creation of this fast exchange gate moves a large-scale quantum circuit using electron-spin qubits in silicon a step closer to reality.

Cover image: Tony Melov

This Week

News in Focus



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Books & Arts





    News & Views

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    How Nature reported the barring of UK women from engineering in 1919, and a celebration of key advances from the industrial revolution.

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    The quantum interference of electrons that have been scattered by light has been used to produce holograms of the underlying electromagnetic fields — and might open up methods for studying materials at high temporal and spatial resolution.

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    Computational models that predict the selectivity of reactions are typically accurate for only a specific reaction type and a narrow range of reaction components. A more general model has now been reported.

    • Per-Ola Norrby
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    An analysis of gene expression in sea-squirt embryos at different stages of development deepens our understanding of how the body plans of vertebrates might have evolved from those of less complex animals.

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  • Perspective

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    Comprehensive single-cell transcriptomes in the proto-vertebrate Ciona intestinalis identified provisional gene networks for 41 different neural subtypes, providing insights into the swimming circuit of tadpoles and the evolution of the vertebrate telencephalon.

    • Chen Cao
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  • Letters

  • Letter |

    A fast, high-fidelity two-qubit exchange gate between phosphorus donor electron spin qubits in silicon is demonstrated by creating a tunable exchange interaction between two electrons bound to phosphorus atom qubits.

    • Y. He
    • , S. K. Gorman
    •  & M. Y. Simmons
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Amendments & Corrections

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