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A photonic crystal cavity with a strongly coupled quantum dot is coherently driven using short laser pulses. Depending on the driving frequency, photon blockade or photon induced tunneling is observed. These nonlinear phenomena at single photon level are used for on-chip generation of nonclassical light.
We coherently probe a quantum dot that is strongly coupled to a photonic crystal nano-cavity by scattering of a resonant laser beam. The coupled systempsilas response is highly nonlinear as the quantum dot saturation with nearly one photon per cavity lifetime. This coherent probing method has applications for classical and quantum information processing.
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