Abstract
Quantum optics potentially offers an information channel from the Universe beyond the established ones of imaging and spectroscopy. All existing cameras and all spectrometers measure aspects of the first-order spatial and/or temporal coherence of light. However, light has additional degrees of freedom, manifest in the statistics of photon arrival times, or in the amount of photon orbital angular momentum. Such quantum-optical measures may carry information on how the light was created at the source, and whether it reached the observer directly or via some intermediate process. Astronomical quantum optics may help to clarify emission processes in natural laser sources and in the environments of compact objects, while high-speed photon-counting with digital signal handling enables multi-element and long-baseline versions of the intensity interferometer. Time resolutions of nanoseconds are required, as are large photon fluxes, making photonic astronomy very timely in an era of large telescopes.
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Dravins, D. (2008). Photonic Astronomy and Quantum Optics. In: Phelan, D., Ryan, O., Shearer, A. (eds) High Time Resolution Astrophysics. Astrophysics and Space Science Library, vol 351. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6518-7_6
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