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A commercial quantum key distribution (QKD) system needs to be formallycertified to enable its wide deployment. The certification should include thesystem's robustness against known implementation loopholes and attacks thatexploit them. Here we ready a fiber-optic QKD system for this procedure. Thesystem has a prepare-and-measure scheme with decoy-state BB84 protocol,polarisation encoding, qubit source rate of 312.5 MHz, and is manufactured byQRate in Russia. We detail its hardware and post-processing. We analyse thehardware for any possible implementation loopholes and discuss countermeasures.We then amend the system design to address the highest-risk loopholesidentified. We also work out technical requirements on the certification laband outline its possible structure.

Preparing a commercial quantum key distribution system for certification against implementation loopholes