Journal
NATURE PHYSICS
Volume 5, Issue 10, Pages 758-763Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS1363
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Funding
- NCCR Quantum Photonics
- Swiss National Science Foundation (SNSF)
- ERC
- QIP IRC
- EPSRC [EP/G000883/1]
- Deutsche Forschungsgemeinschaft (DFG)
- Bundesministerium fuer Bildung und Forschung (BMBF)
- EPSRC [EP/G000883/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G000883/1] Funding Source: researchfish
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Resonant laser scattering along with photon correlation measurements established the atom-like character of quantum dots. Here, we show that for a wide range of experimental parameters it is impossible to isolate elementary quantum-dot excitations from a strong influence of nuclear spins; the absorption lineshapes at magnetic fields exceeding 1 T indicate that the nuclear spins get polarized by an amount that ensures locking of the quantum-dot resonance to the incident laser frequency. In stark contrast to earlier experiments, this nuclear-spin polarization is bidirectional, allowing the combined electron-nuclear-spin system to track the changes in laser frequency dynamically on both sides of the resonance. This unexpected feature stems from a competition between two spin-pumping processes that attempt to polarize nuclear spins in opposite directions. We find that the confluence of laser excitation and nuclear-spin polarization suppresses the fluctuations in resonant absorption. A master-equation analysis suggests narrowing of the nuclear-spin distribution, pointing to applications in quantum information processing.
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