Quantum noise in ideal operational amplifiers
Laboratoire Kastler Brossel,
case 74 4 place Jussieu, F-75252 Paris Cedex 05, France
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