Title: Quantum dots in photonic crystals: from quantum information processing to single photon nonlinear optics
Quantum dot-photonic crystal cavity QED has been probed both in photoluminescence and coherently, by resonant light scattering from such a system . In the latter case, both intensity and photon statistics of the reflected beam have been analyzed as a function of wavelength, leading to observation of effects such as photon blockade and photon induced tunneling - for the first time in solid state . The system has also been employed to achieve a controlled phase and amplitude modulation between two modes of light at the single photon level  - nonlinearity observed so far only in atomic physics systems.
These demonstrations lie at the core of a number of proposals for quantum information processing, and could also be employed to build novel devices, such as optical switches controlled at a single photon level.
1. Dirk Englund, Andrei Faraon, Ilya Fushman, Nick Stoltz, PierrePetroff, and Jelena Vuckovic, "Controlling cavity reflectivity with a single quantum dot," Nature, vol. 450, No. 7171, pp. 857-861, December2007
2. Andrei Faraon, Ilya Fushman, Dirk Englund, Nick Stoltz, PierrePetroff, and Jelena Vuckovic, "Coherent generation of nonclassical light on a chip via photon-induced tunneling and blockade," Nature Physics,10.1038/nphys1078 (Sept. 2008)
3. Ilya Fushman, Dirk Englund, Andrei Faraon, Nick Stoltz, PierrePetroff, and Jelena Vuckovic, "Controlled phase shift with a single quantum dot," Science, vol. 320, number 5877, pp. 769-772 (2008)
10 Minute Talk: Heralded quantum memory for photon polarization states