LV13623 - A first-generation quantum computer must be implemented in the ``cloud" style, since only governments or huge industries will be able to possess such a super-expensive and high-maintenance object. Can we guarantee the security of client's privacy in such a cloud quantum computing? The protocol of blind quantum computation can solve that problem. It is a new secure quantum computing protocol where a client, who does not have enough quantum technology, can
delegate her quantum computation to a server, who has a fully-fledged quantum computer, in such a way that the server cannot learn anything about client's input, output, and program. This protocol was recently experimentally realized in an optical system by Zeillinger's group at Vienna. In this experiment, the discrete degrees of freedom (polarization) of photons was used. In this paper, we have shown that such a blind quantum computation is also possible by using the continuous degrees of freedom of photons. Quantum computation by using such a continuous degrees of freedom is one of the most central research subjects in today's quantum optics, and in fact plenty of experiments have been done. Hence
our result will push the blind quantum computation to a new domain, and
will open a door to more practical secure cloud quantum computation.
