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Article overview
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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 | Abstract: | Repeated 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 | Services: | Forum | Review | PDF | Favorites |
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