Anderson, Neal

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Professor, Department of Electrical and Computer Engineering, College of Engineering
Last Name
Anderson
First Name
Neal
Discipline
Electrical and Computer Engineering
Expertise
Physical information theory; fundamental limits in nanoelectronic information processing; nanocomputing; nanoscale and quantum devices for computing and photovoltaics
Introduction
My research focuses on the physical dimensions of information and computation and their implications for future information technologies.  I am primarily interested in the following topics and their intersections:

  • fundamental physical understanding of information and computation
  • physical-information-theoretic description of computation
  • energy efficiency of computation: opportunities and physical limits 
  • post-CMOS nanocomputing and other unconventional and natural computing paradigms
 
 
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    Conditioning, Correlation and Entropy Generation in Maxwell’s Demon
    (2013-01) Anderson, Neal G.
    Maxwell’s Demon conspires to use information about the state of a confined molecule in a Szilard engine (randomly frozen into a state subspace by his own actions) to derive work from a single-temperature heat bath. It is widely accepted that, if the Demon can achieve this at all, he can do so without violating the Second Law only because of a counterbalancing price that must be paid to erase information when the Demon’s memory is reset at the end of his operating cycle. In this paper, Maxwell’s Demon is analyzed within a “referential” approach to physical information that defines and quantifies the Demon’s information via correlations between the joint physical state of the confined molecule and that of the Demon’s memory. On this view, which received early emphasis in Fahn’s 1996 classical analysis of Maxwell’s Demon, information is erased not during the memory reset step of the Demon’s cycle, but rather during the expansion step, when these correlations are destroyed. Dissipation and work extraction are analyzed here for a Demon that operates a generalized quantum mechanical Szilard engine embedded in a globally closed composite, which also includes a work reservoir, a heat bath and the remainder of the Demon’s environment. Memory-engine correlations lost during the expansion step, which enable extraction of work from the Demon via operations conditioned on the memory contents, are shown to be dissipative when this decorrelation is achieved unconditionally so no work can be extracted. Fahn’s essential conclusions are upheld in generalized form, and his quantitative results supported via appropriate specialization to the Demon of his classical analysis, all without external appeal to classical thermodynamics, the Second Law, phase space conservation arguments or Landauer’s Principle.