By Claude Cohen-Tannoudji

ISBN-10: 9812774963

ISBN-13: 9789812774965

ISBN-10: 9812774971

ISBN-13: 9789812774972

ISBN-10: 981277498X

ISBN-13: 9789812774989

This ebook offers a entire evaluation of the brilliant advances noticeable in atomic physics over the last 50 years. The authors clarify how such development used to be attainable by means of highlighting connections among advancements that happened at various occasions. They speak about the recent views and the recent learn fields that glance promising. The emphasis is positioned, no longer on designated calculations, yet particularly on actual principles. Combining either theoretical and experimental issues, the booklet may be of curiosity to a variety of scholars, academics and researchers in quantum and atomic physics.

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Remark When the coherence length of the center of mass wave packet is very large, a mistake that is frequently made is to think that the electric dipole approximation for the atom-field interaction Hamiltonian is no longer valid. This approximation 4 There are also spin-dependent terms in HI that can be analyzed in the same way as those discussed here. 5 See for example [van Enk (1994)]. 5in 14 ourbook Advances in atomic physics: an overview is based on the smallness of the distance between the electron and the nucleus compared to the wavelength λL of the light field.

5 See for example [van Enk (1994)]. 5in 14 ourbook Advances in atomic physics: an overview is based on the smallness of the distance between the electron and the nucleus compared to the wavelength λL of the light field. It involves the internal variable r = re − rN , not the external variable R. The center of mass can be delocalized in a large volume, with a non-zero probability amplitude to be at two distant points. For each of these possible positions of the center of mass, however, the size of the atom characterized by the electron-nucleus distance r is very small compared to λL , so that the electric dipole approximation is always valid.

Such entangled states of two systems, which often appear when these two systems interact, are a fundamental feature of quantum mechanics. They exhibit very peculiar quantum correlations, which play an essential role in the new field of quantum information. We will come back to the properties of entangled states in Chap. 19. 2 Extension to any two-level atomic system We consider now a two-level system {e, g} that is not necessarily a spin 1/2. For example, g can be the ground state of an atom and e an excited state.

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Advances in atomic physics : an overview by Claude Cohen-Tannoudji

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