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Continuous QND measurements: no quantum noise

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Abstract.

Monitoring an arbitrary observable is analyzed in the framework of Restricted-Path-Integral (RPI) theory of continuous quantum measurements. While in an usual (quantum-demolition) continuous measurement the measurement noise contains both classical and quantum parts, only the classical noise is shown to be present in a quantum nondemolition (QND) continuous measurement. As a result, no absolute restrictions exist on measurability of a QND observable and the measurement output satisfies the classical equation of motion. Monitoring the energy gives an example of a discrete-spectrum observable.

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Authors and Affiliations

  1. Fakultät für Physik der Universität Konstanz, Postfach 5560 M 674, D-78434 Konstanz, Germany, , , , , , DE

    M. Mensky & J. Audretsch

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  1. M. Mensky
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  2. J. Audretsch
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Received: 7 April 1996 / Revised version: 7 August 1996

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Mensky, M., Audretsch, J. Continuous QND measurements: no quantum noise . Appl. Phys. B 64, 129–136 (1997). https://doi.org/10.1007/s003400050156

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  • DOI: https://doi.org/10.1007/s003400050156

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