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This is a Quantitative Study study (also classified as: Experimental Study).

October 8, 2025Applied Physics LettersOpen Access

A highly efficient photodetector for squeezed light measurement in the gigahertz range

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The photodetector achieves high quantum efficiency for squeezed light measurement at frequencies up to 6.4 GHz.
It operates in balanced mode effectively up to 500 MHz, then switches to unbalanced homodyne detection for better sensitivity.
A squeezing level of 10.7 dB was successfully measured, showcasing its capability in quantum metrology.
Identifying frequency response limitations may pave the way for future advancements in high-frequency quantum measurements.

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Development of a photodetector with near-unity quantum efficiency in squeezed light experiments, suggesting improvements for measurement accuracy.

Wilken et al. (2025) studied this question.

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Development of a photodetector with near-unity quantum efficiency in squeezed light experiments, suggesting improvements for measurement accuracy.