Letter abstract
Nature Physics 5, 198 - 202 (2009)
Published online: 25 January 2009 | doi:10.1038/nphys1182
Subject Categories: Condensed-matter physics | Quantum physics | Optical physics
Spin-resolved quantum-dot resonance fluorescence
A. Nick Vamivakas1,4, Yong Zhao1,2,4, Chao-Yang Lu1,3 & Mete Atatüre1
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.
- Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, UK
- Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany
- HFNL & Department of Modern Physics, University of Science and Technology of China, Hefei, 230026, China
- These authors contributed equally to this work
Correspondence to: A. Nick Vamivakas1,4 e-mail: anv21@cam.ac.uk
Correspondence to: Mete Atatüre1 e-mail: ma424@cam.ac.uk
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