Metrology with Unknown Detectors
| Autor: | Fabrizia Somma, Marco G. Genoni, Matteo Altorio, Marco Barbieri |
|---|---|
| Přispěvatelé: | Altorio, Matteo, Genoni, MARCO GIOVANNI, Somma, Fabrizia, Barbieri, Marco, University of Zurich |
| Rok vydání: | 2015 |
| Předmět: |
General Physics and Astronomy
FOS: Physical sciences 610 Medicine & health 02 engineering and technology 01 natural sciences Open quantum system Theoretical physics Physics and Astronomy (all) Quantum state 0103 physical sciences Quantum metrology Quantum information 010306 general physics Physics Quantum Physics Detector 021001 nanoscience & nanotechnology 3100 General Physics and Astronomy 10020 Clinic for Cardiac Surgery Quantum technology Quantum harmonic oscillator 0210 nano-technology Quantum Physics (quant-ph) Algorithm Coherence (physics) Physics - Optics Optics (physics.optics) |
| Zdroj: | Physical Review Letters |
| ISSN: | 1079-7114 |
| Popis: | The best possible precision is one of the key figures in metrology, but this is established by the exact response of the detection apparatus, which is often unknown. There exist techniques for detector characterization that have been introduced in the context of quantum technologies but apply as well for ordinary classical coherence; these techniques, though, rely on intense data processing. Here, we show that one can make use of the simpler approach of data fitting patterns in order to obtain an estimate of the Cramer-Rao bound allowed by an unknown detector, and we present applications in polarimetry. Further, we show how this formalism provides a useful calculation tool in an estimation problem involving a continuous-variable quantum state, i.e., a quantum harmonic oscillator. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|