Negative Kinetic Energy Between Past and Future State Vectors
Daniel Rohrlich, Yakir Aharonov, Sandu Popescu, Lev Vaidman
Abstract
An analysis of errors in measurement yields new insight into classically forbidden quantum processes. In addition to "physical" values, a realistic measurement can yield "unphysical" values; we show that in sequences of measurements, the "unphysical" values can form a consistent pattern. An experiment to isolate a particle in a classically forbidden region obtains a negative value for its kinetic energy. It is the weak value of kinetic energy between past and future state vectors.
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