  Most currently used cryptographic tools for protecting data are based on
certain computational assumptions, which makes them vulnerable with respect to
technological and algorithmic developments, such as quantum computing. One
existing option to counter this potential threat is quantum key distribution,
whose security is based on the laws of quantum physics. Quantum key
distribution is secure against unforeseen technological developments. A second
approach is post-quantum cryptography, which is a set of cryptographic
primitives that are believed to be secure even against attacks with both
classical and quantum computing technologies. From this perspective, this study
reviews recent progress in the deployment of the quantum-secured infrastructure
based on quantum key distribution, post-quantum cryptography, and their
combinations. Various directions in the further development of the full-stack
quantum-secured infrastructure are also indicated. Distributed applications,
such as blockchains and distributed ledgers, are also discussed.
