Re: "it's in the implementation where things start to get very sticky"
In theory, theory and practice are the same; in practice, theory and practice are different. ..... Arthur the cat
And such renders to quantum communications practitioners their stealthy secure decidedly unfair and inequitable overwhelming advantage, Arthur the cat.
However, one might like to now know, before there be many proposing to be interested for their own personal selfish gain, It is not a failsafe protocol for everyone whenever only needed for an extremely select few into doing great business with an extremely selective few .... who may or may not be considered chosen and exalted because of what they are purported to be able to do ..... and the emerging evidence would support as being honestly true.
And yes, it's in the implementation where things start to get very sticky and tricky for many who deserve nothing less and a whole lot more besides, with many not able to survive to experience because of their wilful and wanton sinnings in the past and their encouraging stalwart support for such activities in others.