Summary
A simple closed expression for the complete time behavior of a two-level «atom» interacting with a classical stochastic electromagnetic field is given. The answer for the energy of the atom as a function of time is in terms of a contour integral involving the power spectrum of the perturbing radiation. The cases of Lorentzian, Gaussian and «square» spectral-line profiles are compared; no significant difference in the time behavior is found in these three cases.
Riassunto
Si presenta una semplice espressione chiusa per il comportamento temporale completo di un «atomo» a due livelliche interagisce con un campo elettromagnetico stocastico classico. La risposta per l'energia dell'atomo in funzione del tempo è espressa in termini di un integrale di contorno che coinvolge lo spettro di potenza della radiazione perturbante. Si fa un confronto fra i casi di profili lorentziani, gaussiani e «quadrati»; non si trova alcuna differenza significativa nel comportamento temporale nei tre casi.
Резюме
Приводится простое замкнутое выражение для временного поведения двухуровневого «атома», взаимодействующего с классическими стохастическим электромагнитным полем. Выражение для энергии атома, как функции времени, записывается в виде контурного интеграла, включающего степенной спектр возмущающего излучения. Рассматриваются и сравниваются случаи лоренцева, гауссова и «прямоугольного» профилей спектральных линий. В этих трех случаях не обнаружено существенных различий во временном поведении.
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References
L. I. Schiff:Quantum Mechanics (New York, N. Y., 1954).
I. I. Rabi:Phys. Rev.,51, 652 (1937).
S. H. Autler andC. H. Townes:Phys. Rev.,100, 703 (1955).
F. W. Cummings:Am. J. Phys.,30, 898 (1962). Other recent references to more recent work on noisy excitation of atoms may be found inJ. H. Eberly, C. V. Kunazs andK. Wodkiewicz:J. Phys. B,13, 217 (1980).
E. T. Jaynes andF. W. Cummings:Proc. IEEE,51, 89 (1963).
K. Wodkiewicz:Phys. Rev. A,19, 1686 (1979) shows that the factorization is exact for the case in which the field fluctuates only in its phase and in the manner of a Wiener-Levy Gaussian stationary process. The justification of the present factorization must avait further study, but the results obtained are consistent with several well-known cases.
Cf., for example,M. C. Wang andG. E. Uhlenbeck:Rev. Mod. Phys.,17, 323 (1945).
F. W. Cummings:Phys. Rev. Sect. A,140, 1051 (1965).
J. H. Eberly, N. B. Narozhny andJ. J. Sanchez-Mondragon:Phys. Rev. Lett.,47, 838 (1981).
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Cummings, F.W. Interaction of a two-level atom with a stochastic electromagnetic field. Il Nuovo Cimento B 70, 102–112 (1982). https://doi.org/10.1007/BF02814015
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DOI: https://doi.org/10.1007/BF02814015