I overview recent extensions of state-of-the-art discrete-variable (DV) tomographic, error-correction, and cryptographic protocols to continuous-variable (CV) systems, including: (1) a theory of appropriately defined CV state designs, and their applications to design-based CV shadow tomography; (2) a cryptographic protocol utilizing squeezed states whose proof of security is based on a CV extension of DV monogamy-of-entanglement games; (3) sample efficiency of homodyne and photon-number-resolving tomography obtained via recasting said protocols in terms of shadow tomography; and (4) a new class of quantum spherical codes inspired by classical spherical codes.