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Under lock & key
Grace Sharma
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![Gesturing towards their project, senior Alec Riso describes the mechanisms of the group’s QKD system alongside senior Karthik Thyagarajan. “This laser generates a stream of photons. We lined it up with a collimated lens, [which] focuses the laser into an optical fiber,” senior Connor Whiting said. “The optical fibers [preserve or maintain] are how you measure the polarization state of the photon, which lets us do the encryption protocol.”](https://www.tjtoday.org/wp-content/uploads/2024/05/IMG_0867-e1715793225721-900x1200.jpeg)
