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---
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fixes:
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- |
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Improve performance of :class:`qiskit.quantum_info.Statevector` and
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:class:`qiskit.quantum_info.DensityMatrix` for low-qubit circuit
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simulations by optimizing the class ``__init__`` methods. Fixes
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`#4281 <https://github.com/Qiskit/qiskit-terra/issues/4281>`_
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