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.

Photonic Integrated Circuits (PIC)

Explore how Swabian Instruments’ Time Tagger enables picosecond-level timing, high-throughput photon counting, and multi-channel synchronization for advanced photonic integrated circuit (PIC) and quantum photonics testing.

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From left to right: a rack-mounted setup with eight Swabian Instruments Time Tagger X units, labeled “up to 160 inputs.” In the center, a single Time Tagger X acquires input data from a photonic integrated circuit (PIC) containing multiple labeled components, including phase shifters and nonlinear frequency conversion elements. Light from the source is coupled into the PIC via an optical fiber array, manipulated on-chip, and detected by single-photon detectors before being read out by the timing electronics. The output data is transferred to a PC on the right side of the image.

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