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Q: Fachverband Quantenoptik und Photonik

Q 6: Quantum Optics (Miscellaneous) I

Q 6.4: Vortrag

Montag, 14. März 2022, 15:00–15:15, Q-H14

Information Extraction in Photon Counting Experiments — •Timon Schapeler and Tim Bartley — Mesoscopic Quantum Optics, Department of Physics, Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany

How much information out of the total available Hilbert space can be extracted with a certain detection architecture in photon-counting experiments? The answer to this question can quantify the photon-number resolution of the detector under test. We use quantum detector tomography, which yields a quantum mechanical description of a detector in terms of its positive operator valued measures (POVMs), to compare the quality of five different multiplexed detectors. Quantum detector tomography yields the conditional probabilities of different detection outcomes occurring given a certain number of incident photons, which can directly be used to determine figures of merit such as efficiency, dark counts and cross-talk. These measures provide an intuition of the quality of the detector; however, it may be unclear how they combine to determine the utility of certain detection outcomes. Here, the concept of information is much more useful. From the POVMs we can calculate the amount of information that can be extracted out of the Hilbert space by certain detection outcomes.