Hannover 2010 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

Q: Fachverband Quantenoptik und Photonik

Q 30: Quantum Effects: QED II / Interference and Correlations III

Q 30.8: Talk

Wednesday, March 10, 2010, 15:45–16:00, A 320

Quantum displacement detection with a beam of paired photons — Martin Ostermeyer and •Carsten Henkel — Universität Potsdam, Germany

Light beams with strong correlations in the transverse plane, be they classical or quantum, can improve the resolution of optical images and even lead to novel concepts (“ghost imaging”). We discuss here the application of correlated photon pairs for the precision detection of the transverse displacement of a beam. The photon pairs can be produced with spontaneous parametric down-conversion and have EPR-like correlations in their positions and momenta. A non-classical regime is available where correlation lengths are below the diffraction limit [1]. We discuss the quantum noise limits for the beam displacement with a split detector scheme [2], both with and without the requirement of coincident photon detection.
[1] M. Ostermeyer, D. Korn, D. Puhlmann, C. Henkel, J. Eisert, J. mod. Opt. 56 (2009) 1829
[2] C. Fabre, J. B. Fouet, A. Maître, Opt. Lett. 25 (2000) 76; M. T. L. Hsu, V. Delaubert. P. K. Lam, W. P. Bowen, J. Opt. B 6 (2004) 495