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Volume 571 Issue 7765, 18 July 2019

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

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Amendments & Corrections

  • Author Correction |

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