Berlin 2001 – scientific programme

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Q: Quantenoptik

Q 9: Poster: Quantum Information

Q 9.5: Poster

Tuesday, April 3, 2001, 12:30–15:00, AT2

Quantum optical weak measurements can visualize photon dynamics in real time — •Thomas Konrad, Jürgen Audretsch, and Artur Scherer — Fakultät für Physik der Universität Konstanz, Germany

An experiment is proposed to visualize stroboscopically in real time the dynamics of a photon oscillating between two cavities. The visualization is implemented by a sequence of weak measurements (POVM), which are carried out by probing one of the cavities with a Rydberg atom and detecting a resulting phase shift by Ramsey interferometry. This way to measure the number of photons in a cavity was experimentally realized by Brune et al. . We suggest a feedback mechanism which minimizes the disturbance due to the measurement and enables a detection of the original evolution of the radiation field.

[1] J. Audretsch, Th. Konrad, and A. Scherer, e-print: quant-ph/0012060.

[2] J. Audretsch, Th. Konrad, and A. Scherer, e-print: quant-ph/0008026.