Journal article · Preprint article
Giant nonlinear interaction between two optical beams via a quantum dot embedded in a photonic wire
Optical nonlinearities usually appear for large intensities, but discrete transitions allow for giant nonlinearities operating at the single-photon level. This has been demonstrated in the last decade for a single optical mode with cold atomic gases, or single two-level systems coupled to light via a tailored photonic environment.
Here, we demonstrate a two-mode giant nonlinearity with a single semiconductor quantum dot (QD) embedded in a photonic wire antenna. We exploit two detuned optical transitions associated with the exciton-biexciton QD level scheme. Owing to the broadband waveguide antenna, the two transitions are efficiently interfaced with two free-space laser beams.
The reflection of one laser beam is then controlled by the other beam, with a threshold power as low as 10 photons per exciton lifetime (1.6 nW). Such a two-color nonlinearity opens appealing perspectives for the ealization of ultralow-power logical gates and optical quantum gates, and could also be implemented in an integrated photonic circuit based on planar waveguides.
Language: | English |
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Year: | 2018 |
ISSN: | 1550235x , 10980121 , 24699969 and 24699950 |
Types: | Journal article and Preprint article |
DOI: | 10.1103/PhysRevB.97.201106 |
ORCIDs: | Gregersen, Niels |