qiskit.quantum_info.DensityMatrix.from_instruction¶
-
classmethod
DensityMatrix.
from_instruction
(instruction)[source]¶ Return the output density matrix of an instruction.
The statevector is initialized in the state \(|{0,\ldots,0}\rangle\) of the same number of qubits as the input instruction or circuit, evolved by the input instruction, and the output statevector returned.
- Parameters
instruction (qiskit.circuit.Instruction or QuantumCircuit) – instruction or circuit
- Returns
the final density matrix.
- Return type
- Raises
QiskitError – if the instruction contains invalid instructions for density matrix simulation.