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In a pioneering experiment in the field of quantum optics, NQSTI researchers observed for the first time quantum-correlated twin beams in cascaded quadratic nonlinear processes within a single optical cavity. A noise reduction of up to 5 dB has been observed, opening new prospects for next-generation quantum communication and information technologies.
Experimental setup for the generation of twin beams and measured squeezing spectra for different pump powers.
To our knowledge, this is the first experimental observation of squeezing in twin beams generated through cascaded quadratically nonlinear processes in a single cavity. The demonstration of twin-beam correlations in our cascaded system opens the way to extensive investigations of its exclusive nonclassical properties. In fact, the complex interactions in the system lead to a variety of nonclassical effects that are not accessible via each single nonlinear process, such as multipartite entanglement, which is of paramount importance for the development of advanced quantum communication.
The complete paper is available here https://opg.optica.org/ol/fulltext.cfm?uri=ol-49-7-1733