Complex weak values in quantum measurement

Details Complex weak values in quantum measurement Complex weak values in quantum measurement

2007-06-28

arxiv.org/abs/0706.4207v1

Physics

Quantum Physics

5 pages

Scientific paper

10.1103/PhysRevA.76.044103

In the weak measurement formalism of Y. Aharonov et al. the so-called weak value A_w of any observable A is generally a complex number. We derive a physical interpretation of its value in terms of the shift in the measurement pointer's mean position and mean momentum. In particular we show that the mean position shift contains a term jointly proportional to the imaginary part of the weak value and the rate at which the pointer is spreading in space as it enters the measurement interaction.

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