Decoherence - Fluctuation Relation and Measurement Noise

Details Decoherence - Fluctuation Relation and Measurement Noise Decoherence - Fluctuation Relation and Measurement Noise

1999-03-22

arxiv.org/abs/quant-ph/9903072v1

Phys.Rept.320:51,1999

Physics

Quantum Physics

6 pages, no figures, for Okun Festschrift, Physics Reports

Scientific paper

10.1016/S0370-1573(99)00065-4

We discuss fluctuations in the measurement process and how these fluctuations are related to the dissipational parameter characterising quantum damping or decoherence. On the example of the measuring current of the variable-barrier or QPC problem we show there is an extra noise or fluctuation connected with the possible different outcomes of a measurement. This noise has an enhanced short time component which could be interpreted as due to ``telegraph noise'' or ``wavefunction collapses''. Furthermore the parameter giving the the strength of this noise is related to the parameter giving the rate of damping or decoherence.

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