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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster II

Q 30.58: Poster

Tuesday, March 3, 2009, 16:30–19:00, VMP 9 Poster

Spatial high-precision measurements in quantum optical systems — •Qurrat- ul-Ain and Jörg Evers — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

Accurate measurement of the position of a quantum particle or of distances between quantum particles are a subject of long-standing interest in quantum mechanics. A particular class of schemes to measure interparticle distance on a scale short as compared to the involved light wavelengths is based on dipole-dipole interactions between the particles [1,2]. This interaction affects the optical properties and this can be detected in the optical far field.

Here, we present a scheme for the measurement of the distance between two nearby identical atoms via the collective resonance fluorescence. We are in particular interested in a realistic description requiring as little prior knowledge about the system as possible. In contrast to previous work, we consider four-level atoms with complete Zeeman manifolds. Thus, we take into account the usual dipole-dipole couplings that couple the parallel dipole moments as well as the so far mostly neglected couplings between orthogonal dipole moments in the two atoms [3]. A consequence of including these orthogonal dipole-dipole couplings is that those atomic levels may also be populated which are not driven by laser fields.

[1] C. Hettich et al., Nature 298, 385 (2002).

[2] Jun-Tao Chang, Jörg Evers, Marlan O. Scully, and M. S. Zubairy, Phys. Rev. A 73, 031803(R) (2006).

[3] G. S. Agarwal and A. K. Patnaik, Phys. Rev. A 63, 043805 (2001).