Weak measurement: Effect of the detector dynamics

Details Weak measurement: Effect of the detector dynamics Weak measurement: Effect of the detector dynamics

2008-01-11

arxiv.org/abs/0801.1814v2

Phys. Rev. A 77, 042108 (2008) (5 pages)

Physics

Quantum Physics

5 pages, 3 figures. References added. Minor revisions

Scientific paper

10.1103/PhysRevA.77.042108

A general approach to the measurement of an observable with pre- and post-selection is presented. The limit of weak measurement is studied in detail, and it is shown that the phase of the probe, including a Hamiltonian contribution to it, gives rise to observable effects, since the coherence of the probe is essential for the concept of complex weak value to be meaningful. As a particular example, the measurement of a spin component is considered. We find that the contribution of the imaginary part of the weak value is sizeable in this case.

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