 Empty circle control qubit notation

ID: empty-circle-control-qubit-notation

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Empty circle control qubit notation by

Ciro Santilli 35  Updated 2025-03-25  +Created 1970-01-01

Some authors use the convention of:

filled black circle: conventional controlled quantum gate, i.e. operate if control qubit is active
empty (White) circle: operate if control qubit is inactive

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