[en] In typical cavity quantum electrodynamics (QED)experiments, atoms traversing the optical cavity experience position dependent coupling constants due to the standing wave structure of the cavity mode. Most theories in the field of cavity QED, however, assume a spatially uniform coupling constant and even its tunability. We have realized this seemingly unrealistic feature by employing a nanopore lattice aperture along the path of the atoms. This specific aperture has nanometer scale holes in the form of a two dimensional lattice with a 791nm pitch, which is the same as the transition wavelength ("1"S"0"→"3"P"1")of atomic barium. Barium atoms that pass through this aperture interact with a high Q cavity in the cavity QED microlaser with an identical coupling strength. To reduce the spatial dispersion of the atomic beam, the cavity we newly fabricated has a special geometry so that the aperture can be placed very close (up to a distance of 500μm)to the cavity mode. When the horizontal position of the aperture is translated so as to make the vertical columns of nanopores aligned with the antinodes of the cavity, the atoms experience the maximum coupling. If the columns of nanopores and the nodes of the cavity field overlap each other, on the contrary, the atom cavity coupling vanishes. We have observed the controlled coupling constants by measuring the microlaser output as a function of the aperture translation. Our nanopore lattice technique provides a new opportunity to perform various cavity QED experiments with continuously tunable atom cavity coupling constants

[en] We introduce a miniaturized magnetic shield integrated into the physics package of a chip-scale atomic clock. The primary shield, which is formed by a stack of precision-machined high-permeability plates, compactly sits inside the package as it is designed to be the internal supporting frame. Further improved by a Kovar lid, the best frequency sensitivity to a longitudinal external field is 1.1(3) × 10⁻¹¹/μT, which is consistent with the measured shielding factor, while the transverse sensitivity is well below 10⁻¹²/μT. The sealed unit on a chip carrier alone allows stable clock operation with a frequency instability of 4.8(2) × 10⁻¹² at 1000 s. (author)

[en] The evaluation of the quadratic Zeeman shift in atomic fountain frequency standards requires information on the magnetic field distribution along the drift region. Plotting Zeeman frequencies against various launching heights provides the temporally averaged magnetic field values seen by the flying atoms. Using those data, we were able to deduce a reasonable field map by taking the approach of solving an inverse problem. We employed a regularization method after establishing a linear set of equations. The analysis enabled us to evaluate the quadratic Zeeman shift and its uncertainty against various launching heights. Our method encompasses and generalizes the deconvolution method. This paper covers the mathematical tricks to solve the inverse problem and its application to the atomic fountain frequency standard KRISS-F1. (author)

[en] In this reply to the Comment by Bouchene et al.[Phys. Rev. A 84, 037801 (2011)], we show that our experiment [Phys. Rev. A 81, 053824 (2010)] was a legitimate demonstration of the atomic Solc filter for the range of parameters that we have studied. The more detailed theoretical framework presented in the Comment and the interpretation of its outcome in terms of nonadiabatic jump are only necessary for larger field intensities.

[en] We report experimental realization of a rudimentary atomic Solc filter, recently proposed by Hong et al. [Opt. Express 17, 15455 (2009)]. It is realized by employing a bipolar atom-cavity coupling constant in the cavity-QED microlaser operating with a TEM₁₀ mode in a strong coupling regime. The polarity flip in the coupling constant dramatically changes the photoemission probability of a two-level atom relative to unipolar coupling, resulting in multiple narrow emission bands in the detuning curve of the microlaser mean photon number. The observed resonance curves are explained well by a two-step, three-dimensional, geodesic-like motion of the Bloch vector in the semiclassical limit.