Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, EpiSciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation

Mesure adaptative non destructive du nombre de photons dans une cavité

Abstract : An adaptive measurement aims at optimizing the acquisition of information on a system, with the help of a feedback loop on the measuring apparatus. In our cavity quantum electrodynamics setup we have achieved an adaptive measurement of a quantum system, the microwave field trapped in a high finesse superconducting cavity. Circular Rydberg atoms interact dispersively with the field and achieve a quantum nondemolition measurement of the photon number by a succession of "weak" measurements. Taking into account all measurement outcomes, the measurement back-action and all experimental imperfections, a control computer estimates the field state in real-time. The phase of the Ramsey interferometer defining the atomic measurement is then optimized so that the following detections bring maximal information. We demonstrate that the preparation of Fock states is clearly accelerated using an adaptive technique, compared to a passive protocol where the choice of measurement phase is predefined. Such an adaptive measurement is of great interest in presence of decoherence, and could be used for example in quantum feedback protocols where the speed of state estimation is crucial.
Document type :
Complete list of metadata

Cited literature [114 references]  Display  Hide  Download
Contributor : Bruno Peaudecerf Connect in order to contact the contributor
Submitted on : Friday, November 22, 2013 - 3:22:50 PM
Last modification on : Thursday, March 17, 2022 - 10:08:05 AM
Long-term archiving on: : Sunday, February 23, 2014 - 4:28:55 AM


  • HAL Id : tel-00908255, version 1


Bruno Peaudecerf. Mesure adaptative non destructive du nombre de photons dans une cavité. Physique Quantique [quant-ph]. Université Pierre et Marie Curie - Paris VI, 2013. Français. ⟨tel-00908255⟩



Record views


Files downloads