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Atomic coherence
About: Atomic coherence is a research topic. Over the lifetime, 877 publications have been published within this topic receiving 29395 citations.
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TL;DR: In this article, the effects of stimulated scattering of optical lattice photons on atomic coherence times in a state-of-the-art clock was investigated, and it was shown that photon scattering can limit the achievable coherence time to less than 12 s.
Abstract: We investigate the effects of stimulated scattering of optical lattice photons on atomic coherence times in a state-of-the art $^{87}\mathrm{Sr}$ optical lattice clock. Such scattering processes are found to limit the achievable coherence times to less than 12 s (corresponding to a quality factor of $1\ifmmode\times\else\texttimes\fi{}{10}^{16}$), significantly shorter than the predicted 145(40) s lifetime of $^{87}\mathrm{Sr}$'s excited clock state. We suggest that shallow, state-independent optical lattices with increased lattice constants can give rise to sufficiently small lattice photon scattering and motional dephasing rates as to enable coherence times on the order of the clock transition's natural lifetime. Not only should this scheme be compatible with the relatively high atomic density associated with Fermi-degenerate gases in three-dimensional optical lattices, but we anticipate that certain properties of various quantum states of matter---such as the localization of atoms in a Mott insulator---can be used to suppress dephasing due to tunneling.
43 citations
16 May 2004
TL;DR: In this article, the enhancement of coherent Raman scattering in Rb vapor by exciting atomic coherence with fractional STIRAP was demonstrated, and the results support the possibility of increasing the CARS sensitivity.
Abstract: We experimentally demonstrated the enhancement of coherent Raman scattering in Rb vapor by exciting atomic coherence with fractional STIRAP. The results support the possibility of increasing the CARS sensitivity
43 citations
TL;DR: In this article, the authors experimentally demonstrate cavity field control by another laser beam with three-level Lambda-type atoms inside an optical ring cavity, by adjusting the frequency detuning of the controlling beam (coupled to one of the atomic transitions).
Abstract: We experimentally demonstrate cavity field control by another laser beam with three-level \ensuremath{\Lambda}-type atoms inside an optical ring cavity. By adjusting the frequency detuning of the controlling beam (coupled to one of the atomic transitions), the intensity of the cavity field interacting with another atomic transition is switched on and off. Such all-optical switching between two steady states is caused by the enhanced Kerr nonlinearity due to atomic coherence in such system.
42 citations
TL;DR: In this article, the effects of coherence between the states of a two-level atom on the phenomenon of collapses and revivals in an undamped binomial state of the electromagnetic field are investigated.
Abstract: The effects of the coherence between the states of a two-level atom on the phenomenon of collapses and revivals in an undamped binomial state of the electromagnetic field are investigated. It is found that the Rabi oscillations exhibit qualitatively different behaviour for different phases of coherence between the levels. This behaviour in the binomial state of the field is in contrast with that in a coherent state field, in which case the Rabi oscillations are qualitatively the same for all values of the coherence between the two atomic levels.
42 citations
TL;DR: It is predicted that the three-level cascade atomic system, under certain conditions, exhibits almost perfect squeezing outside the cavity and it is shown that certain higher-order squeezing can also be achieved inside the cavity, under a suitable choice of different parameters.
Abstract: A three-level cascade atomic system is considered where atomic coherence can be achieved either by applying an intense pump field or initially preparing the atoms in a coherent superposition of the states. It is predicted that the system, under certain conditions, exhibits almost perfect squeezing outside the cavity. By using the steady-state Q solution it is also shown that certain higher-order squeezing can also be achieved inside the cavity, under a suitable choice of different parameters
42 citations