Causality and the nature of information

Klaas Wynne

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Superluminal propagation of electromagnetic radiation and photon tunnelling have been studied by a variety of direct and indirect techniques. Especially the use of femtosecond terahertz pulses, whose electric field can be measured directly, has resulted in the (re)discovery of a number of effects in which light propagates over small distances faster than the speed of light in vacuum. Naturally, this brings up the question whether information can be exchanged superluminally. It has been shown in nearly all cases studied that the principle of causality applies to the underlying physical processes. It has been argued, however, that the principle of causality might have no bearing on the question of superluminal information transfer. It will be shown here that all the confusion stems from a vague definition of the concept of information and from ignoring noise. Once the concept of information (and noise) has been defined properly, it can be shown that if the principle of causality applies then useful superluminal information exchange is strictly prohibited.
LanguageEnglish
Pages85-100
Number of pages15
JournalOptics Communications
Volume209
Issue number1-3
DOIs
Publication statusPublished - 1 Aug 2002

Fingerprint

Bearings (structural)
Light velocity
Electromagnetic waves
Photons
Electric fields
Vacuum
information transfer
confusion
stems
electromagnetic radiation
vacuum
propagation
electric fields
Haemophilus influenzae type b-polysaccharide vaccine-diphtheria toxoid conjugate
photons
pulses

Keywords

  • causality
  • information
  • superluminal propagation
  • electromagnetic radiation
  • photon tunnelling
  • nanoscience

Cite this

Wynne, Klaas. / Causality and the nature of information. In: Optics Communications. 2002 ; Vol. 209, No. 1-3. pp. 85-100.
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Causality and the nature of information. / Wynne, Klaas.

In: Optics Communications, Vol. 209, No. 1-3, 01.08.2002, p. 85-100.

Research output: Contribution to journalArticle

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