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qubithubhadamard-test

Estimates the complex expectation value <psi|U|psi> of a unitary operator using quantum interference on an ancilla qubit. The real part is extracted from the default circuit; adding S-dagger before the final Hadamard gives the imaginary part.

RunCite

No licence specified, so all rights are reserved by default — forking copies this circuit but grants you no rights to reuse it.

Framework
Qiskit
Qubits
2
Depth
4
Gate set
H, CU
Licence
Not specified
Version
v1
Updated
3 days ago
Last run
3 months ago

Circuit

circuit.py · Qiskit · depth 4
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README.md · 6.4 KB

Code

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Suggested citation

@software{qubithub_hadamardtest_2026,
  author = {QubitHub Circuits},
  title = {Hadamard Test},
  year = {2026},
  version = {v1},
  url = {https://qubithub.co/qubithub/hadamard-test},
}

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