On the Superluminal Signals in Quantum Electrodynamics | Chapter 03 | Theory and Applications of Physical Science Vol. 1

Using as an example the Fermi problem dealing with nonstationary transformation of optical excitation from one atom to another the reason of superluminal signals appearance in quantum electrodynamics is clearing. It is shown that the calculation using the conventional methods in Heisenberg and Schrödinger representations in nonstationary problems lead to different results. The Schrödinger representation predicts the existents of specified quantum superluminal signals. In Heisenberg representation the superluminal signals are absent. The reason of non-identity of representations is close connected with using of the adiabatic hypothesis.

Author(s) Details

B. A. Veklenko
Joint Institute for High Temperatures of the Russian Academy of Sciences 125412, str. Izhorskaia, 13, build 2, Moscow, Russian Federation.

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Superluminal Signals in Quantum Optics | Chapter 02 | Theory and Applications of Physical Science Vol. 1

Theoretically and experimentally the superluminal signals arising at passage of an electromagnetic pulse through thermally excited media are investigated. It is shown that the equations of quantum electrodynamics solved by standard methods explain the appearance of such signals as a consequence of fluctuation properties of secondary quantum fields. It is indicated that quantum averages from operators of electric strength and magnetic strength in these signals are equal to zero. The field energy is different from zero. Such signals have no classical analogues. The effective superluminal velocity of the laser beam after it crosses the cylindrical parallel layer of thermally excited atoms has been calculated. The results of experiments to measure the effective superluminal velocity of the beam passing a cylindrical layer of air inside a hot metal tube are given. Quantitative agreement of theoretical and experiment data is stated.

Author(s) Details

B. A. Veklenko
Joint Institute for High Temperatures of the Russian Academy of Sciences 125412, str. Izhorskaia, 13, build 2, Moscow, Russian Federation.

Y. I. Malachov
National Research University (Moscow Power Engineering Institute) 111250, str. Krasnokazarmennaja 14, Moscow, Russian Federation.

C. S. Nguyen
National Research University (Moscow Power Engineering Institute) 111250, str. Krasnokazarmennaja 14, Moscow, Russian Federation.

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