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This prototype demonstrates significant progress in free-space optical communication by achieving substantial path length differences without relying on complex adaptive optics systems. By utilizing a passive Herriott cell design to maintain signal integrity over atmospheric disturbances and wide fields of view, the research offers a more compact alternative for practical long-distance quantum or secure data links. This advancement directly addresses scalability challenges inherent in current interferometry methods used for quantum key distribution and high-bandwidth wireless transmission.

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Researchers Build Interferometer with 0.4° Field of View

Quantum ZeitgeistAugust 19, 20264 min read

A 12 nanosecond path length difference, maintained across a 0. 4° field-of-view, now defines the limit of compact free-space optical interferometry. This prototype surpasses previous methods by enabling long time-bin delays within a small physical footprint, a key step towards practical long-distance links.

Ramy Tannous and colleagues at the Research Council of Canada and the University of Waterloo have demonstrated a field-widened, multimode interferometer utilising a Herriott cell design. The prototype achieves a path length difference of 12ns while maintaining a 0.4° field-of-view, offering a passive and compact alternative to adaptive optics. The team created a new interferometer design that simplifies free-space optical communication, a method of transmitting data wirelessly via light. The device successfully maintains a clear signal despite atmospheric disturbances,…

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