We prove that Gaussian operations are of no use for protecting Gaussian states against Gaussian errors in quantum communication protocols. Specifically, we introduce a new quantity characterizing anyâ€¦ (More)

We devise a scheme that protects quantum coherent states of light from probabilistic losses, thus achieving the first continuous-variable quantum erasure-correcting code. If the occurrence ofâ€¦ (More)

We experimentally demonstrate a continuous variable quantum erasure-correcting code, which protects coherent states of light against complete erasure. The scheme encodes two coherent states into aâ€¦ (More)

It is shown that the ensemble {P(alpha),|alpha|alpha;{*}}, where P(alpha) is a Gaussian distribution of finite variance and |alpha is a coherent state, can be better discriminated with an entangledâ€¦ (More)

We investigate the violation of local realism in Bell tests involving homodyne measurements performed on multimode continuous-variable states. By binning the measurement outcomes in an appropriateâ€¦ (More)

ii Acknowledgments My gratitude goes to Nicolas Cerf for introducing me to the fascinating field of quantum information, and for giving me the opportunity to pursue this thesis. I would also like toâ€¦ (More)

We present a generic method to construct a product basis exhibiting Nonlocality Without Entanglement with n parties each holding a system of dimension at least nâˆ’1. This basis is generated via aâ€¦ (More)