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Quantum frequency combs : generation and use


Frequency combs, made of the coherent superposition of many longitudinal modes, are good examples of highly multimode quantum objects, that can be of interest in massively parallel quantum information processing and quantum metrology.  We have shown theoretically that frequency combs generated by Synchronously Pumped Parametric Oscillators (SPOPO) exhibit nonclassical features such as multimode squeezing and multipartite entanglement, that can be tailored at will by adjusting the shape of the pump pulses.  I will report on the first achievements of our SPOPO experiment and show how these "quantum frequency combs" can be used in the future to improve time measurements beyond the shot noise limit.