The idea of exploring quantum features of light to perform more precise astrophysical measurements is a long-desired goal of both the optics and astrophysics communities, but only recently the theoretical proposals have started to be experimentally implemented. We are building quantum-enhanced telescopes for precision astrometry, i.e., measurements of position and velocity of celestial objects. I will present a proof-of-principle experimental demonstration of a two-photon interferometer. Additionally, I will present a single-photon-sensitive spectrometer, based on a linear array of 512 single-photon avalanche diode detectors, with 0.04nm spectral and 40ps temporal resolutions. This device enables us to implement a spectral binning technique, essentially allowing us to perform multiple measurements together, because each frequency can be treated as an independent measurement. This device is also useful for other quantum applications. Lastly, I will report on Hanbury Brown-Twiss experiments. Our work represents a step towards quantum telescopes.
*This work was supported by the U.S. Department of Energy QuantISED award and the the Brookhaven National Laboratory LDRD grants 19-30 and 22-22. This work was supported by the Lourie Fellowship from the Stony Brook University Department of Physics and Astronomy. This work was supported by the Ministry of Education, Youth and Sports of the Czech Republic Grant No. LM2023034, as well as from European Regional Development Fund Project "Center of Advanced Applied Science" No. CZ.02.1.01/0.0/0.0/16-019/0000778. This work was also supported by the EPFL internal IMAGING project "High-speed multimodal super-resolution microscopy with SPAD arrays" and the DOE/LLNL project "The 3DQ Microscope"
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Publication:Towards Quantum Telescopes: Demonstration of a Two-Photon Interferometer for Quantum-Assisted Astronomy. arXiv:2301.07042 Fast spectrometer near the Heisenberg limit with direct measurement of time and frequency for multiple single photons. arXiv:2304.11999
