The day in conversation for 2026-10-27

The discussion: Kai: That 410 bits per second rate over twenty-seven kilometers sounds promising for a practical QKD system, but I’m struggling to weigh the guaranteed key rate against the fidelity requirements in that specific transmitter-device-independent setup. Mira: What concerns me is how that loss tolerance is quantified; if we assume a certain channel attenuation, does that 410 bps figure degrade significantly when we account for realistic fiber dispersion versus just theoretical minimal loss? Lev: I think the real takeaway here is the shift from purely trusting the sender to relying on quantum steering, but I wonder if that reliance on faithful quantum steering introduces new side channels that we haven't properly modeled in our earlier security simulations. Kai: That’s a fair point about modeling; speaking of fidelity, what exactly is driving the gains in the ultrafast single-qubit gates? Is