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Generation of Gaussian and non-Gaussian multimode entangled states of light for applications to Quantum Information Processing


The development of Wavelength Division Multiplexing has been at the origin of a revolution in communication that has even changed our everyday life. It is natural to investigate now whether this way of encoding and processing classical information can be extended to the domain of quantum information processing. We show that parametrically generated optical frequency combs, spanning over more than one million wavelength components, exhibit highly multipartite entanglement between the quantum fluctuations of its frequency modes. We show how to produce and characterize such highly multimode quantum states of light and discuss the ways to make use of them in Measurement Based Quantum Computing. We finally show how to produce, by mode-selective photon subtraction, the pure states exhibiting non-Gaussian statistics that are needed to provide a quantum advantage in Quantum Computing tasks.