1993/04/30 by Kai J. Druhl, Kai J. Drühl, Druhl, Kai J.
Computer Science · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Quantum Information and Cryptography #Quantum Mechanics and Applications #Spectroscopy and Quantum Chemical Studies #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9304322
8 pages with 1 figure available upon request
arxiv created 1993/04/30 · openalex publication_date 1993/04/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In the measurement of a continuous observable Q, the pure components of the reduced state do, in general, depend on the initial state. For measurements which attempt to localize the measured system in a certain region R, the localized wave functions are proportional to the original wave function outside of R. This `quantum memory' effect shows that it is not possible to perfectly localize a quantum particle.