C. Sánchez-Muñoz, E. del Valle, A. González-Tudela, S. Lichtmannecker, K. Müller, M. Kaniber, C. Tejedor, J. J. Finley, F. P. Laussy
We propose a scheme based on the coherent excitation of a two-level system in a cavity to generate an ultrabright CW and focused source of quantum light that comes in N-photon bundles, for an integer N tunable with the frequency of the exciting laser. We focus on the case 1<=N<=3 and show that close to 100% of two-photon emission and 10% of three-photon emission is within reach of state of the art semiconductor samples. Unlike a conventional laser, this is achieved with a cavity population much less than one. The "purity of N-photon emission" is introduced to characterize such sources and to bypass shortcomings of the standard Nth order coherence functions.
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http://arxiv.org/abs/1306.1578
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