It now seems likely that quantum key distribution (QKD) techniques can provide practical building blocks for highly secure networks and in fact may offer valuable cryptographic services, such as unbounded secrecy lifetimes, which can be difficult to achieve by other techniques. Unfortunately, however, QKD’s impressive claims for information assurance have been to date at least partly offset by a variety of limitations. For example, traditional QKD is distance limited, can only be used across a single physical channel (e.g., freespace or telecommunications fiber, but not both in series due to frequency propagation and modulation issues), and is vulnerable to disruptions such as fiber cuts because it relies on single points of failure.
CITATION STYLE
Elliott, C. (2005). The DARPA quantum network. In Quantum Communications and Cryptography (pp. 83–102). CRC Press. https://doi.org/10.1201/9781420026603.ch4
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