Macroscopic Observables

  title={Macroscopic Observables},
  author={D. Poulin},
  • D. Poulin
  • Published 2004
  • Physics
  • We study macroscopic observables defined as the total value of a physical quantity over a collection of quantum systems. We show that previous results obtained for an infinite ensemble of identically prepared systems lead to incorrect conclusions for finite ensembles. In particular, exact measurement of a macroscopic observable significantly disturbs the state of any finite ensemble. However, we show how this disturbance can be made arbitrarily small when the measurements are of finite accuracy… CONTINUE READING
    18 Citations
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