Quantum noise in ideal operational amplifiers

Details Quantum noise in ideal operational amplifiers Quantum noise in ideal operational amplifiers

1998-11-24

arxiv.org/abs/quant-ph/9811062v1

Europhys.Lett. 46 (1999) 31-37

Physics

Quantum Physics

4 pages, 2 figures, RevTeX

Scientific paper

10.1209/epl/i1999-00558-3

We consider a model of quantum measurement built on an ideal operational amplifier operating in the limit of infinite gain, infinite input impedance and null output impedance and with a feddback loop. We evaluate the intensity and voltage noises which have to be added to the classical amplification equations in order to fulfill the requirements of quantum mechanics. We give a description of this measurement device as a quantum network scattering quantum fluctuations from input to output ports.

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