“…One of the most well known facets of weak measurement scheme is the concept of the so called weak values of an observable, which are, in general, complex numbers. In the last few years, weak values have been used in the context of measuring quantities which may or may not have quantum mechanical observables associated with them, for example, the geometric phase [18], non Hermitian operators [19], density matrix corresponding to a quantum state [20][21][22], or the entanglement content of a quantum state [23,24]. The weak value amplification technique has found recent physical application in observations of the spin Hall effect [25], photon trajectories [26], or the time delay between ultra fast processes [27] as well.…”