Reversible computing

operation which returns the database to some previous state, which is crucial for recovering from database server crashes

in quantum computing, a universal reversible logic gate consisting of a CNOT gate with two control bits and one target bit

Undo is an interaction technique which is implemented in many computer programs. It erases the last change done to the document, reverting it to an older state. In some more advanced programs, such as graphic processing, undo will negate the last command done to the file being edited. With the possibility of undo, users can explore and work without fear of making mistakes, because they can easily be undone.

universal reversible logic gate, applied in quantum computing

model of computing

idealized model of a reversible mechanical computer