1. E. T. Jaynes andF. W. Cummings:Proc. IEEE,51, 89 (1963).
2. S. Haroche andJ. M. Raimond: inAdvances in Atomic and Molecular Physics, edited byD. Bates andB. Bederson, Vol.20 (Academic, New York, N.Y., 1985), p. 347;D. Meschede, H. Walther andG. Müller:Phys. Rev. Lett.,54, 551 (1985);G. Rempe, H. Walther andN. Klein:Phys. Rev. Lett.,58, 353 (1987).
3. A. J. Campillo, J. D. Eversole andH.-B. Lin:Phys. Rev. Lett.,67, 437 (1991)
4. M. Kasevich andS. Chu:Phys. Rev. Lett.,67, 181 (1991).
5. R. Graham andM. Höhnerbach:Z. Phys. B,57, 233 (1984);K. Zaheer andM. S. Zubairy:Phys. Rev. A,37, 1628 (1988).