Weak Values in an Electronic Mach-Zehnder Interferometer

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Aharonov et al. introduced the concept of weak values [1] as statistical averages of weak measurements on a quantum system whose states both before and after the measurement are known. As opposed to the standard value, the weak value can lie outside the spectrum of eigenvalues of the measured operator, can be negative for positive defined quantities, and can even be complex.


This Demonstration shows the real and imaginary parts of the weak value of charge in one arm of an electronic Mach–Zehnder interferometer [2].


Contributed by: Alessandro Romito (March 2011)
After work by: Vadim Shpitalnik, Yuval Gefen, and Alessandro Romito
Open content licensed under CC BY-NC-SA



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