I highly suspect this might be a spelling mistake for qubit, since the question is also tagged with qubit, 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.
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