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I have started studying quantum computing with the effort to model "human behavior". In view of this research effort, I am posting a fundamental question.

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closed as unclear what you're asking by tparker, John Rennie, M. Enns, Jon Custer, honeste_vivere Aug 18 '17 at 13:42

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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It doesn't have to be. We can use any other 2-level system we want to make a qubit. For example, with a SQUID you have the states of something akin to a pendulum oscillator. You pick the parameters so the two lowest states are isolated from the others so you effectively are only working in that 2-level system. You can also do other systems as long as you've got $d$ states separate from the rest that you know how to control and then you can make a qudit with $d$ instead of binary.

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