Quantum/Optics CN

Intensity Interferometry

This page details the principles and advantages of intensity interferometry, a powerful technique in optical astronomy used to measure stellar diameters and spatial structure through photon correlation. Swabian Instruments’ Time Taggers enable high-precision, scalable, and synchronized intensity interferometry experiments with picosecond timing resolution, real-time data processing, and long-baseline support.

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Two schematic diagrams representing an intensity interferometry experiment with telescopes at a far (left) and near (right) distance, respectively. Left: Looking at the same bright star, each of the two telescopes is connected to a Time Tagger. The Time Taggers are synchronized such that they use the same reference clock. Right: The two telescopes, looking at the same bright star, are connected to the same Time Tagger. In this case, there is no need for synchronization, because the single Time Tagger has an internal reference clock.

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