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As one of the authors of the paper, and of the original theory papers on which that experimental realisation is based, perhaps I can attempt to answer. The BQC protocol used in that paper is based on a model of computations where measurements are made on a specially chosen entangled state (this is known as measurement-based quantum computation or MBQC, and ...


7

It looks like you're asking about this part of the paper: Therefore, a quantum computation is hidden as long as these measurements are successfully hidden. In order to achieve this, the BQC protocol exploits special resources called blind cluster states that must be chosen carefully to be a generic structure that reveals nothing about the underlying ...


2

If you look at the literature for blind quantum computation, there is the concept of a "trap state". Basically, something that isn't part of the main computation that is supposed to give specific results so that you can easily verify that the computer is behaving as expected. I believe some of these trap states are Bell pairs, and the measurements performed ...


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