Speaker
Yaron Kedem
Description
The weak measurement protocol, introduced by Aharonov,
Albert and Vaidman 25 years ago, is now in widespread use.
They showed that weak coupling of a measurement device to a
quantum system, together with a postselection, can yield an
intriguing quantity which was named The Weak Value. In some
contexts an observable on the system can be replaced
by its Weak Value, even though it can be much larger than
any of its eigenvalues and is also complex in general. The
method of weak measurements have been shown to be highly
useful both for the analysis of fundamental issues in
quantum mechanics and for practical applications such as
precision improvement. We will start with a review of the
formalism and then discuss a recent development regarding
the enhancement of the Signal to Noise Ratio for precision
measurements in the presence of technical noise. We will see
that when imaginary weak values are used, such a noise can
improve the precision.
Reference: Y. Kedem, Phys. Rev. A 85, 060102 (R) (2012)
