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Facts and myths about zero-point thermal noise, and information entropy versus thermal entropy
Texas A&M Univ, Dept Elect & Comp Engn, College Stn, TX USA.
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.
Arizona State Univ, Sch Elect Comp & Energy Engn, Tempe, AZ USA.
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2017 (English)In: 2017 International Conference on Noise and Fluctuations (ICNF), New York: IEEE, 2017Conference paper, Published paper (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
New York: IEEE, 2017.
Series
International Conference on Noise and Fluctuations, ISSN 2575-5587, E-ISSN 2575-5595
Keywords [en]
Second Law, noise, measurements, entropy, information
National Category
Condensed Matter Physics Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-354388DOI: 10.1109/ICNF.2017.7985927ISI: 000426915500003ISBN: 978-1-5090-2760-6 (electronic)ISBN: 978-1-5090-2761-3 (print)OAI: oai:DiVA.org:uu-354388DiVA, id: diva2:1229119
Conference
International Conference on Noise and Fluctuations (ICNF), JUN 20-23, 2017, Vilnius, LITHUANIA
Available from: 2018-06-29 Created: 2018-06-29 Last updated: 2020-02-04Bibliographically approved

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Niklasson, Gunnar A.Granqvist, Claes Göran

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