However, delegating quantum computations to a server carries the same privacy and security concerns that bedevil classical cloud computing. Users are currently unable to hide their work from the server or to independently verify their results in the regime where classical simulations become intractable. Remarkably, the same phenomena that enable quantum computing can leave the server “blind” in a way that conceals the client’s input, output, and algorithm [6–8]; because quantum information cannot be copied and measurements irreversibly change the quantum state, information stored in these systems can be protected with information-theoretic security, and incorrect operation of the server or attempted attacks can be detected—a surprising possibility which has no equivalent in classical computing.