title: Interfacing spins in an InGaAs quantum dot to a semiconductor waveguide circuit using emitted photons.
abstract: 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.
authors: Department of Physics and Astronomy, University of Sheffield, Sheffield, United Kingdom. i.j.luxmoore@exeter.ac.uk
authors: I J
authors: IJ
authors: Luxmoore
authors: N A
authors: NA
authors: Wasley
authors: A J
authors: AJ
authors: Ramsay
authors: A C T
authors: AC
authors: Thijssen
authors: R
authors: R
authors: Oulton
authors: M
authors: M
authors: Hugues
authors: S
authors: S
authors: Kasture
authors: V G
authors: VG
authors: Achanta
authors: A M
authors: AM
authors: Fox
authors: M S
authors: MS
authors: Skolnick