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29 March 2024
 
  » arxiv » 1502.2938

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Repeated measurements from unitary evolution: avoiding the projection postulate
David Oehri ; Andrei V. Lebedev ; Gordey B. Lesovik ; Gianni Blatter ;
Date 10 Feb 2015
AbstractRepeated measurements as typically occurring in two-time correlators rely on von Neumann’s projection postulate, telling how to restart the system after a measurement. We describe an alternative procedure where co-evolving quantum memories extract system information through entanglement, combined with a final readout of the memories according to Born’s rule. We apply this procedure to the calculation of the electron charge correlator in mesoscopic physics and the photon intensity correlator in quantum optics. While our approach to repeated quantum measurements deals with any system-memory coupling, we show that the limits of strong (weak) measurements are correctly reproduced at strong (weak) coupling.
Source arXiv, 1502.2938
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