Charles Bennett is a computer scientist in IBM's Physics of Information group. He continues the work of
logically and thermodynamically reversible computing, in which entropy increases are limited to the final storage of information, which in turn implies
erasure of some storage media. This is known as
Landauer's Principle.
Bennett does not discuss the underlying
physics of irreversibility.
With Gilles Brassard, Bennett developed the field of
quantum cryptography, which uses
entangled quantum two-particle systems to generate and distribute encryption keys and allow two parties to communicate messages that are secure against eavesdropping by third parties. Their quantum key distribution scheme is called
BB84
Bennett is one of the leaders in the new field of
quantum information theory.
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