Comparison on security of single server and multiple servers blind quantum protocols
Yuichi Sano · arXiv (Cornell University) · 2021
A user who delegates quantum computation to others hopes to keep information on the computation secret. Several different blind quantum computation protocols which attain this goal have been proposed thus far. While in single server protocols a user needs to manipulate quantum states, multiple server protocols do not require a user to have any quantum equipment although they prohibit any communication among servers even after the computation. It is not a straightforward task for a user to decide the most proper protocol among them as each protocol has its own merits and defects. In this paper we introduce a notion called usability which enables us to compare the different protocols. In particular we consider a blind protocol with multiple servers which allows classical communication during and after the computation, and compare it with a single server protocol. As a result we find that their usability are partially equal to each other.