Abstract
We demonstrate a 4-dimensional path-encoded QKD system over a 52-km multi-core field-installed fibre. The 4D-QKD has a 68.5 kbit/s secret key rate, which is 118% higher than the equivalent 2D-QKD over the same link, owing to the higher dimensionality and greater noise resilience.
© 2022 The Author(s)
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