Path-dependent initialization of a single quantum dot exciton spin in a   nano-photonic waveguide
  We demonstrate a scheme for in-plane initialization and readout of a single exciton spin in an InGaAs quantum dot (QD) coupled to a GaAs nanobeam waveguide. The chiral coupling of the QD and the optical mode of the nanobeam enables spin initialization and readout fidelity approaching unity in magnetic field $B=1$ T and $\sim$0.9 without the field. We further show that this in-plane excitation scheme is independent of the incident excitation laser polarization and depends solely on the excitation direction. This scheme provides a robust in-plane spin excitation basis for a photon-mediated spin network for quantum information applications. 
Rikki J. Coles, David M. Price, Ben Royall, Edmund Clarke, Maurice S.   Skolnick, Anthony M. Fox, Maxim M. Makhonin
quant-ph cond-mat.mes-hall