Abstract
Photon correlations are central to quantum applications with light. We show that the photon-statistics of the light emitted by optical systems under coherent and resonant excitation can be modulated from Sub- to Super-Poissonian due to a self-homodyne interference. This scheme can be further controlled and/or optimized at the N-photon level by purposely tuning the coherent excitation. As one application of our theory, we design a perfectly antibunched and subnatural-linewidth (monochromatic) source, based on resonance fluorescence (a qubit weakly excited). Furthermore, the study highlights the close relation between two relevant quantum attributes of light, photon antibunching and quadrature squeezing, which were so far studied separately. This paradigm is not only interesting for single-mode correlations but can also be extended to multi-frequency spectroscopy. When the laser-qubit detuning is large, a perfect circle of antibunching between photons with different frequencies arises due to quantum interferences, revealing exotic multi-mode squeezing properties of great potential for applications.
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