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Facts and myths about zero-point thermal noise, and information entropy versus thermal entropy
Department of Electrical and Computer Engineering, Texas A&M University, College Station,.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.ORCID iD: 0000-0002-8279-5163
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe.
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2017 (English)In: 2017 International Conference on Noise and Fluctuations, IEEE, 2017Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

In this talk, we are briefly surveying our recent results [1-3] about two very popular yet often misunderstood concepts in physical informatics: (i) The existence of Johnson noise at near to absolute zero temperature has been debated many times yet it is generally accepted [1]. We point out the fundamental problems [2] with the particular approach the related quantum theories [4] of Fluctuation-Dissipation Theorem are using. Then we prove that the existence of zero-point noise would allow the construction of a perpetual motion machine [1]. Finally, we cite early works pointing out that the observed "zeropoint" noise in experiments [7] with phase-sensitive linear amplifiers is an amplifier-noise [5,6] due to the uncertainty principle, and it does not exist in the resistor in an objective way, independently from the measurement [1,2]. Thus a correct derivation of the Fluctuation-Dissipation Theorem must include[1] the type of experimental setup used for the measurement. (ii) The general opinion is that information entropy and thermal entropy are interchangeable. This belief triggered Brillouin's negentropy principle of information [8], and Landauer's claimed principle [9] about energy dissipation during information erasure that has been debated on many occasions [10-19]. Here we show the newest and perhaps the simplest arguments [3] proving that the two types of entropies are apples and oranges and are not interchangeable.

Place, publisher, year, edition, pages
IEEE, 2017.
Keyword [en]
Second Law; noise; measurements; entropy; information.
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Solid State Physics
Identifiers
URN: urn:nbn:se:uu:diva-332948DOI: 10.1109/ICNF.2017.7985927ISBN: 978-1-5090-2760-6 (print)OAI: oai:DiVA.org:uu-332948DiVA: diva2:1154560
Conference
2017 International Conference on Noise and Fluctuations
Available from: 2017-11-02 Created: 2017-11-02 Last updated: 2017-11-02

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