# Stuttgart 2012 – wissenschaftliches Programm

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# Q: Fachverband Quantenoptik und Photonik

## Q 9: Quanteneffekte: Interferenz und Korrelationen

### Q 9.7: Vortrag

### Montag, 12. März 2012, 15:30–15:45, V7.01

**Numerical realizations of optical centroid measurements** — •Qurrat Ul-Ain and Jörg Evers — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Optical imaging methods are typically restricted to a resolution of order of the probing light wavelength λ by the Rayleigh diffraction limit. This limit can be circumvented by making use of correlated *N*-photon states, having an effective wavelength λ/*N*. But the required *N*-photon detection usually renders these schemes unfeasible. In [1], an imaging scheme is proposed that replaces the multi-photon detectors by an array of single-photon detectors. It has been predicted in [1] that using a post-processing of the measured data, the resolution scaling of λ/*N* can be achieved for certain states of light. We aim at extending the approach to a broader class of input states, at finding optimum detection strategies, and at quantitatively studying the approach. For this, complementary to the existing approximate analytical results, we explore the approach using “experimental” data obtained from numerical experiments by sampling detection events from the initial state wave function. We analyze the resolution in dependence on the detector size to find optimum parameters for an experimental implementation. We also find indications that the scheme might work for a broader class of states than predicted based on the analytical estimates.

[1] M. Tsang, Phys. Rev. Lett., **102**, 253601 (2009).