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For questions about the construction of complex circuits using elementary quantum gates.
20
votes
How can I obtain transformation matrix of a quantum circuit in the Qiskit?
While you can get the unitary matrix representation of a circuit using the unitary simulator as shown in the other answers, there is a much easier way using the Operator class in the qiskit.quantum_in …
34
votes
Accepted
What is a "barrier" in Qiskit circuits?
You won't find the barrier in quantum computing textbooks because it isn't a standard primitive of quantum information theory like unitary gates and quantum circuits.
The barrier acts as a directive f …