Photonic qubits, qutrits and ququads accurately prepared and delivered on demand

@article{NisbetJones2012PhotonicQQ,
  title={Photonic qubits, qutrits and ququads accurately prepared and delivered on demand},
  author={Peter B. R. Nisbet-Jones and Jerome Alexander Martin Dilley and Annemarie Holleczek and Oliver Barter and Axel Kuhn},
  journal={New Journal of Physics},
  year={2012},
  volume={15},
  url={https://api.semanticscholar.org/CorpusID:110606655}
}
Reliable encoding of information in quantum systems is crucial to all approaches to quantum information processing or communication. This applies in particular to photons used in linear optics quantum computing, which is scalable provided a deterministic single-photon emission and preparation is available. Here, we show that narrowband photons deterministically emitted from an atom–cavity system fulfil these requirements. Within their 500 ns coherence time, we demonstrate a subdivision into d… 
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