Observation of Faraday rotation from a single confined spin
By M. Atature, J. Dreiser, Antonio Badolato, A. Imamoğlu. 2006
201 citations recorded by the source corpus.
The ability to read out the state of a single confined spin lies at the heart of solid-state quantum-information processing1. Although spin measurements using Faraday rotation of light polarization have been implemented in semiconductor spin ensembles2,3,4, single-spin read-out has only been achieved using transport measurements5,6. Here, we demonstrate an all-optical dispersive measurement of the time-averaged spin state of a single electron in a quantum dot. We obtain information on the spin state through conditional Faraday rotation of a spectrally detuned laser, induced by the polarization- and spin-selective trion (charged quantum dot) transitions. To assess the sensitivity of the technique, we use an independent resonant laser for spin-state preparation7. We infer that there are ∼10 spin-flip Raman scattering events (that is, back-action) within our measurement timescale. Straightforward improvements such as incorporating solid-immersion lenses8,9 and higher efficiency detectors should allow for back-action-evading spin measurements, without the need for a cavity.
Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/9920a976e86cb89b9f6b63f50500adab340a5771
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In Artificial Intelligence
- Klemens Hammerer
- Anders Søndberg Sørensen
- Eugene Simon Polzik
- Umberto Perinetti
- H. Jeff Kimble
- Darrick E. Chang
In Atomic and Molecular Physics, and Optics
- Klemens Hammerer
- Anders Søndberg Sørensen
- Eugene Simon Polzik
- Umberto Perinetti
- Darrick E. Chang
- H. Jeff Kimble
Citations in the corpus
- Quantum interface between light and atomic ensembles (2008, background): “Experiments with spin polarized dots show sufficient ground state coherence times and possibility of optical pumping and quantum nondemolition coupling (Atature et al., 2007).”
- Optical Properties of Semiconductor Quantum Dots (2008, methodology): “The most common technique for growing self-assembled QDs, the Stranski-Krastanov (SK) method, allows for the fabrication of QDs with good optical properties: nearly lifetime limited linewidth of the optical transitions in these dots makes them suitable for single spin measurement [99] and two photon”