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Phys Rev Lett. 2013 Jan 18;110(3):037402. Epub 2013 Jan 14.

Interfacing spins in an InGaAs quantum dot to a semiconductor waveguide circuit using emitted photons.

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Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom.


An in-plane spin-photon interface is essential for the integration of quantum dot spins with optical circuits. The optical dipole of a quantum dot lies in the plane and the spin is optically accessed via circularly polarized selection rules. Hence, a single waveguide, which can transport only one in-plane linear polarization component, cannot communicate the spin state between two points on a chip. To overcome this issue, we introduce a spin-photon interface based on two orthogonal waveguides, where the polarization emitted by a quantum dot is mapped to a path-encoded photon. We demonstrate operation by deducing the spin using the interference of in-plane photons. A second device directly maps right and left circular polarizations to antiparallel waveguides, surprising for a nonchiral structure but consistent with an off-center dot.

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