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I found a tag named that was tagged in this question.

I highly suspect this might be a spelling mistake for qubit, since the question is also tagged with , and no other question has this tag. However I’d like to confirm this, as I’m quite new to quantum computing, and not very familiar with the terms used in such.

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    $\begingroup$ While a qubit is a vector in a 2D space, a qudit is in $d$-dimensions, so it's all good! :) $\endgroup$ – Mithrandir24601 Mar 30 '18 at 13:40
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Similar to the qubit, the qutrit is the unit of quantum information in 3-level quantum systems. This is analogous to the unit of classical information trit of ternary computers. The term "qudit" (quantum digit) denotes the unit of quantum information in d-level quantum systems (normally 3 or more).

Source: Variations of the qubit

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