lets go  by its definition :Quantum key distribution (QKD) uses quantum mechanics to guarantee secure communication. It enables two parties to produce a shared random secret key known only to them, which can then be used to encrypt and decrypt messages.

So it works in economic growth where the puzzle or secret of unlocking stale communication amongst states or parties,()which has affected economic growth negatively.Applying the principle of QKD will help open up communication /dialogue for better memoranda of understanding  between economiesu.No economy can survive alone  or is so self suffcient 

QKD can protect the information you sent or received. It is in particular useful in banking and defense.