Journal
NATURE PHOTONICS
Volume 6, Issue 9, Pages 605-609Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2012.181
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Funding
- National Centre of Competence in Research, Quantum Photonics (NCCR QP)
- research instrument of the Swiss National Science Foundation (SNSF)
- European Research Council (ERC) Advanced Investigator Grant
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An as yet outstanding goal in quantum optics is the realization of fast optical nonlinearities at the single-photon level. This would allow for the implementation of optical devices with new functionalities such as single-photon switches/transistors(1,2) or controlled-phase gates(3). Although nonlinear optics effects at the single-emitter level have been demonstrated in a number of systems(4-13), none of these experiments showed single-photon switching on ultrafast timescales. Here, we perform pulsed two-colour spectroscopy and demonstrate that, in a strongly coupled quantum dot-cavity system, the presence of a single photon on one of the fundamental polariton transitions can turn on light scattering on a transition from the first to the second Jaynes-Cummings manifold. The overall switching time of this single-photon all-optical switch(14) is similar to 50 ps. In addition, we use the single-photon nonlinearity to implement a pulse correlator. Our quantum dot-cavity system could form the building block of future high-bandwidth photonic networks operating in the quantum regime(15-18).
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