Comment on “Non-representative Quantum Mechanical Weak Values”
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Svensson (Found Phys 45: 1645, 2015) argued that the concept of the weak value of an observable of a pre- and post-selected quantum system cannot be applied when the expectation value of the observable in the initial state vanishes. Svensson’s argument is analyzed and shown to be inconsistent using several examples.
KeywordsWeak value Weak measurement Past of photon Nested interferometer Two-state vector formalism
We thank Lukas Knips, Jan Dziewior and Jasmin Meinecke for useful discussions. This work has been supported in part by the Israel Science Foundation Grant No. 1311/14 and the German-Israeli Foundation for Scientific Research and Development Grant No. I-1275-303.14.