Quantum computer using noisy environment

In general, behind visible objects there exist hidden objects. And, the visible and hidden objects interact with each other. Therefore, to obtain the information about the whole system, we have to predict information about the hidden objects through their effect on the visible objects. We formalize such a task in quantum systems and investigate such a situation. In previous research, some special structures of systems are supposed. In our research, we only assume that the dimension of the quantum system is finite and give a strategy for obtaining all of the information about the system from the observation of the visible objects. Using this strategy, we can identify even noisy devices rigorously and treat them as a resource for quantum information processing.

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