Interaction-free measurement and forward scattering

Details Interaction-free measurement and forward scattering Interaction-free measurement and forward scattering

1998-04-23

arxiv.org/abs/quant-ph/9804058v1

Physics

Quantum Physics

4 pages in RevTex + 1 figure in eps; submitted to Phys. Rev. A since 09Jan98; now updated

Scientific paper

10.1103/PhysRevA.58.4206

Interaction-free measurement is shown to arise from the forward-scattered wave accompanying absorption: a "quantum silhouette" of the absorber. Accordingly, the process is not free of interaction. For a perfect absorber the forward-scattered wave is locked both in amplitude and in phase. For an imperfect one it has a nontrivial phase of dynamical origin (``colored silhouette"), measurable by interferometry. Other examples of quantum silhouettes, all controlled by unitarity, are briefly discussed.

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