Synopses: Information Technology
Quantum computing and error correction:
A quantum bit represents data as one way and another (0 and 1 and all possibilities in between). Can survey all solutions at once and pick the correct one in a single step. However, much of the information contained in a quantum system will vanish if it is observed, because the process of looking at it disturbs the system. … a user can look at the answer to a question but can’t check the calculations behind it. So, a quantum computer needs to correct errors reliably without anyone actually seeing them. (Source: Chiaverini, J., et al. 2004. Realization of quantum error correction. Nature 432:602-605)
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