Quantum key distribution



The most regularly performed nontrivial task using quantum information to date has been quantum key distribution. Quantum key distribution (QKD) is a method of securely distributing cryptographic key material for subsequent cryptographic use. In particular, it is the sharing of random classical bit strings using quantum states. Its use of a set of nonorthogonal quantum states then requires this key material to be considered quantum information.1 The quantum encoding of cryptographic keys for distribution is valuable because the no-cloning theorem and the superposition principle governing quantum states confer a uniquely powerful form of information security during transmission of key bits. For maximal security, it can be followed by one-time pad message encryption, which is the only cryptographic method that has been proven to be unbreakable once a random key has been securely shared.


Quantum Channel BB84 Protocol Plaintext Message Unambiguous State Discrimination Eavesdrop Strategy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer Science+Business Media, LLC 2007

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