Physical and logical qubits
In quantum computing, a qubit is a unit of information analogous to a bit (binary digit) in classical computing, but it is affected by quantum mechanical properties such as superposition and entanglement which allow qubits to be in some ways more powerful than classical bits for some tasks. Qubits are used in quantum circuits and quantum algorithms composed of quantum logic gates to solve computational problems, where they are used for input/output and intermediate computations.
Quaject
In computer science, a quaject is an object-like data structure containing both data and code (or pointers to code), exposed as an interface in the form of "callentries", and can accept a list of callentries to other quajects for "callbacks" and "callouts". They were developed by Alexia Massalin in 1989 for the "Synthesis kernel", and named for the "Qua! Machine", a unique hardware platform built by Massalin. The origin of the term 'qua' is unclear; Massalin claims humorously that it is a sound made by koalas.