On the origin of strong photon antibunching in weakly nonlinear photonic molecules

Details On the origin of strong photon antibunching in weakly nonlinear photonic molecules On the origin of strong photon antibunching in weakly nonlinear photonic molecules

2010-07-09

arxiv.org/abs/1007.1605v1

Physical Review A: Atomic, Molecular and Optical Physics 83 (2011) 021802

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.83.021802

In a recent work [T. C. H. Liew and V. Savona, Phys. Rev. Lett. {\bf104}, 183601 (2010)] it was numerically shown that in a photonic 'molecule' consisting of two coupled cavities, near-resonant coherent excitation could give rise to strong photon antibunching with a surprisingly weak nonlinearity. Here, we show that a subtle quantum interference effect is responsible for the predicted efficient photon blockade effect. We analytically determine the optimal on-site nonlinearity and frequency detuning between the pump field and the cavity mode. We also highlight the limitations of the proposal and its potential applications in demonstration of strongly correlated photonic systems in arrays of weakly nonlinear cavities.

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