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OpenQASM
Qiskit
PennyLane
Cirq
tag:
overlap
✕
OpenQASM
test
Hadamard Test
Estimates ⟨ψ|U|ψ⟩ using an ancilla qubit, controlled-U, and measurement. Fundamental for many quantum algorithms.
@quantumcomputer
2q
3g
↓0
⑂0
hadamard-test
overlap
subroutine
OpenQASM
test
SWAP Test
Determines the overlap between two quantum states without measuring them. Ancilla qubit reads |0⟩ if states are identical.
@quantumcomputer
3q
3g
↓0
⑂0
swap-test
overlap
subroutine