Author: ["A. Nick Vamivakas","Yong Zhao","Chao-Yang Lu","Mete Atatüre"]
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Abstract
Two experiments observe the so-called ‘Mollow triplet’ in the emission spectrum of a quantum dot—originating from resonantly driving a dot transition—and demonstrate the potential of these systems to act as single-photon sources and as a readout modality for electron-spin states. Confined spins in self-assembled semiconductor quantum dots promise to serve both as probes for studying mesoscopic physics in the solid state and as stationary qubits for quantum-information science1,2,3,4,5,6,7. Moreover, the excitations of self-assembled quantum dots can interact with near-infrared photons, providing an interface between stationary and ‘flying’ qubits. Here, we report the observation of spin-selective photon emission from a resonantly driven quantum-dot transition. The Mollow triplet8 in the scattered photon spectrum—the hallmark of resonance fluorescence when an optical transition is driven resonantly—is presented as a natural way to spectrally isolate the photons of interest from the original driving field. We also demonstrate that the relative frequencies of the two spin-tagged photon states can be tuned independent of an applied magnetic field through the spin-selective dynamic Stark effect, induced by the same driving laser. This demonstration should be a step towards the realization of challenging tasks such as electron-spin readout, heralded single-photon generation for linear-optics quantum computing and spin–photon entanglement.Cite this article
Nick Vamivakas, A., Zhao, Y., Lu, CY. et al. Spin-resolved quantum-dot resonance fluorescence. Nature Phys 5, 198–202 (2009). https://doi.org/10.1038/nphys1182 