Photon-number resolution with microwave Josephson photomultipliers
arXiv:2310.05604 · doi:10.1103/PhysRevA.108.063710
Abstract
We study counting photons confined in a mode of a microwave resonator via repeated measurements by a Josephson photomultiplier (JPM). The considered JPM is essentially a flux-biased phase qubit operating as a single-photon detector. We identify optimal operational regimes that maximize photon-number resolution within a predetermined range. Two counting techniques are studied. The first is to count the total number of clicks in the measurement sequence. The second involves counting the number of clicks until the occurrence of either the first no-click event or the end of the measurement sequence. Our theoretical methods employ the derived positive operator-valued measures for the considered photocounting techniques and the introduced measure of the photon-number resolution. The results reveal that the resolution decrease in both cases is mainly caused by the JPM relaxation. As an example, we show how the obtained results can be used for practical testing nonclassical properties of electromagnetic radiation in a microwave resonator.
18 pages, 10 figures
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Cited by in corpus (5)
- Flux qubit-based detector of microwave photons
- Tight inequalities for nonclassicality of measurement statistics
- Detector of microwave photon pairs based on a Josephson photomultiplier
- Two-photon coupling via Josephson element I: Breaking the symmetry with magnetic fields
- Nonclassical photocounting statistics with a single on-off detector