| Issue |
Europhys. Lett.
Volume 46, Number 1, April I 1999
|
|
|---|---|---|
| Page(s) | 31 - 37 | |
| Section | Classical areas of phenomenology | |
| DOI | https://doi.org/10.1209/epl/i1999-00558-3 | |
| Published online | 01 September 2002 | |
Quantum noise in ideal operational amplifiers
Laboratoire Kastler Brossel,
case 74 4 place Jussieu, F-75252 Paris Cedex 05, France
Received:
26
November
1998
Accepted:
18
January
1999
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 feedback 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.
PACS: 42.50.Lc – Quantum fluctuations, quantum noise, and quantum jumps / 03.65.Bz – Quantum mechanics: Foundations, theory of measurement, miscellaneous theories (including Aharonov-Bohm effect, Bell inequalities, Berry's phase) / 07.50.-e – Electrical and electronic components, instruments and techniques
© EDP Sciences, 1999
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