In 1961 Landauer showed "that the erasure of one bit of information is necessarily accompanied by the release of at least kTln(2) of heat into the environment" this defines the theoretical minimum for energy consumed by a system with memory which is W = kT ln(2) for each bit of a state, where k is a Boltzmann constant and T is a system temperature. This principle helped to solve the paradox of Maxwell's Demon.
The following articles are a good source of reference
"The physics of forgetting: Landauer’s erasure principle and information theory" - http://www3.imperial.ac.uk/pls/portallive/docs/1/55905.PDF
Information: From Maxwell’s demon to Landauer’s eraser - http://scitation.aip.org/content/aip/magazine/physicstoday/article/68/9/10.1063/PT.3.2912
The following articles are a good source of reference
"The physics of forgetting: Landauer’s erasure principle and information theory" - http://www3.imperial.ac.uk/pls/portallive/docs/1/55905.PDF
Information: From Maxwell’s demon to Landauer’s eraser - http://scitation.aip.org/content/aip/magazine/physicstoday/article/68/9/10.1063/PT.3.2912
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