期刊
NATURE PHYSICS
卷 5, 期 3, 页码 198-202出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS1182
关键词
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资金
- University of Cambridge
- EPSRC Science and Innovation Awards
- QIPIRC of EPSRC
- A. v. H. Foundation
- LGFG
- CSC
- CAS
- EPSRC [EP/G000883/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G000883/1] Funding Source: researchfish
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 science(1-7). 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 triplet(8) 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.
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