What is the value of an observable between pre- and postselection?

Details What is the value of an observable between pre- and postselection? What is the value of an observable between pre- and postselection?

2003-08-26

arxiv.org/abs/quant-ph/0308137v2

Phys. Lett. A 322 (2004) 298-300

Physics

Quantum Physics

5 pages, accepted in Phys. Lett. A

Scientific paper

10.1016/j.physleta.2004.01.041

Hall's recent derivation of an exact uncertainty relation [Phys. Rev. A64,
052103 (2001)] is revisited. It is found that the Bayes estimator of an
observable between pre- and postselection equals the real part of the weak
value. The quadratic loss function equals the expectation of the squared
imaginary part of the weak value.

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