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

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...

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Bibliographic Details
Published in:Physical review letters 2013-01, Vol.110 (3), p.037402-037402, Article 037402
Main Authors: Luxmoore, I J, Wasley, N A, Ramsay, A J, Thijssen, A C T, Oulton, R, Hugues, M, Kasture, S, Achanta, V G, Fox, A M, Skolnick, M S
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.110.037402