Phys. Rev. A 48, 4084–4090 (1993)Measurements, errors, and negative kinetic energyReceived 5 May 1993; published in the issue dated December 1993 An analaysis of errors in measurement yields insight into the penetration of quantum particles into classically forbidden regions. In addition to physical values, realistic measurements yield ‘‘unphysical’’ values which, we show, can form a consistent pattern. An experiment to isolate a particle in a classically forbidden region obtains negative values for its kinetic energy. These values realize the concept of a weak value, discussed in previous works. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.48.4084
DOI:
10.1103/PhysRevA.48.4084
PACS:
03.65.Bz, 03.65.Ca
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