Strong coupling of a single electron in silicon to a microwave photon

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Science  13 Jan 2017:
Vol. 355, Issue 6321, pp. 156-158
DOI: 10.1126/science.aal2469

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Inducing strong coupling

Quantum dots, or artificial atoms, are being pursued as prospective building blocks for quantum information processing architectures. Communication with other, distant quantum dots requires strong coupling between photons and the electronic states of the dots. Mi et al. used double quantum dots defined in silicon and embedded in a superconducting cavity to achieve such coupling. This demonstration in an industry-relevant material bodes well for the large-scale development of semiconductor-based quantum processors.

Science, this issue p. 156


Silicon is vital to the computing industry because of the high quality of its native oxide and well-established doping technologies. Isotopic purification has enabled quantum coherence times on the order of seconds, thereby placing silicon at the forefront of efforts to create a solid-state quantum processor. We demonstrate strong coupling of a single electron in a silicon double quantum dot to the photonic field of a microwave cavity, as shown by the observation of vacuum Rabi splitting. Strong coupling of a quantum dot electron to a cavity photon would allow for long-range qubit coupling and the long-range entanglement of electrons in semiconductor quantum dots.

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