Physics – Quantum Physics
Scientific paper
2010-06-30
Physical Review Letters 106 (2011) 020502
Physics
Quantum Physics
Scientific paper
10.1103/PhysRevLett.106.020502
Using the retrodictive approach of quantum physics, we show that the state retrodicted from the response of a measurement apparatus is a convenient tool to fully characterize its quantum properties. We translate in terms of this state some interesting aspects of the quantum behavior of a detector, such as the non-classicality or the non-gaussian character of its measurements. We also introduce estimators - the projectivity, the ideality, the fidelity or the detectivity of measurements perfomed by the apparatus - which directly follow from the retrodictive approach. Beyond their fundamental significance for describing general quantum measurements, these properties are crucial in several protocols, in particular in the conditional preparation of non-classical states of light or in measurement-driven quantum information processing.
Amri Taoufik
Fabre Claude
Laurat Julien
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