Negative Kinetic Energy between Past and Future State Vectors Academic Article uri icon


  • An analysis of errors in measurement yields new insight into clas- sically forbidden quantum processes. In addition to "physical" values, a realistic measurement can yield "unphysical" values; we show that in sequences of measure- ments, 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.

publication date

  • January 1, 1995