Seminarium Optyczne

Advanced quantum technologies require scalable and controllable quantum resources. Gaussian states of multimode light, such as squeezed states and cluster states, are scalable quantum systems, which can be generated on demand. We propose here to use the many frequency modes contained within femtosecond optical frequency combs as the carrier of such quantum states. We demonstrate how, without changing the photonics architecture, our source is able to generate many different cluster states, or allows to study fundamental quantities such as EPR steering.However, all these properties are based on Gaussian statistics, while non-Gaussian features are indispensable in many quantum protocols, especially to reach a quantum computational advantage. We demonstrate, using mode dependent photon subtraction, controllable non-Gaussian quantum networks and show theoretically and experimentally the prospective of this approach both for fundamental studies and quantum information applications.