Speaker
Description
The Hanbury Brown-Twiss (HBT) effect, depicting photon bunching of thermal photons, plays an important role in intensity interferometry and is a cornerstone in quantum applications, such as quantum-assisted astrometry. In order to observe the HBT effect, fine spectral and temporal resolutions are necessary. We present results from our single-photon spectrometer built with the LinoSPAD2 camera, which has 256 independent channels, achieving 40 ps temporal resolution and 17 pm spectral resolution (both rms), over a bandwidth of around 5 nm. Moreover, we present first results from a fibre-coupled Mach-Zehnder interferometer (MZI), which represents one of the two stations in the final astrometry scheme. The spectrometer and MZI are set up with single-mode fibres to achieve the best possible spectral resolution and the contrast of the resulting HBT peaks. However, it is difficult to couple light from telescopes to a single-mode fibre due to atmosphere. To find possible ways to bring our setup to a telescope, we investigate multimode fibres in our spectrometer, quantifying the effect it has on the spectral resolution compared to single-mode ones. Consequently, we draw projections for the use of the spectrometer in telescopes and choose possible targets for measurement with this setup.
