期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.037402
关键词
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资金
- EPSRC [EP/G001642, EP/J007544, EP/G004366/1]
- project SPANGL4Q, under FET-Open Grant [FP7-284743]
- Engineering and Physical Sciences Research Council [EP/J007544/1, EP/G001642/1, EP/G004366/1] Funding Source: researchfish
- EPSRC [EP/G004366/1, EP/G001642/1, EP/J007544/1] Funding Source: UKRI
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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