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qiskit.quantum_info.partial_trace

partial_trace(state, qargs)[ソース]

Return reduced density matrix by tracing out part of quantum state.

If all subsystems are traced over this returns the trace() of the input state.

パラメータ
戻り値

The reduced density matrix.

戻り値の型

DensityMatrix

例外

QiskitError – if input state is invalid.

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