Enhancements to Prepare-and-Measure-Based QKD Protocols (Transcript of Discussion)

OK, so I’m going to talk about a little idea for what I believe will enhance quantum key distribution, in particular the BB84 style of prepare-and-measure protocol, so I guess it fits in the theme in the sense that we’re dealing with quantum channels and classical channels, and in particular the relationship between the two, which I think is particularly intriguing. Can I just take a quick poll? Most people in this room have probably come across things like quantum key distribution and BB84, hands up. A fair number, OK. I was planning to just go very quickly through it to refresh and then to introduce the new idea.