Giant Two-Mode Non-linearity Using a Single Quantum Dot Embedded in a Photonic Wire

Optical logic down to the single photon level holds the promise of data processing with a better energy efficiency than electronic devices. In addition, preservation of quantum coherence in such logical components would enable optical quantum logical gates. Optical logic requires optical two-modes non-linearities to allow for photon-photon interactions.

Non-linearities usually appear for large intensities, but discrete transitions in a well coupled single two-level system allow for giant non-linearities operating at the single photon level.