mirror of https://github.com/Qiskit/qiskit.git
17 lines
828 B
YAML
17 lines
828 B
YAML
---
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features:
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The internal computations of :meth:`.Statevector.expectation_value` and
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:meth:`.DensityMatrix.expectation_value` methods have been reimplemented
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in the Rust programming language. This new implementation is multithreaded
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and by default for a :class:`~.Statevector` or :class:`~.DensityMatrix`
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>= 19 qubits will spawn a thread pool with the number of logical CPUs
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available on the local system. You can you can control the number of
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threads used by setting the ``RAYON_NUM_THREADS`` environment variable to
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an integer value. For example, setting ``RAYON_NUM_THREADS=4`` will only
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use 4 threads in the thread pool.
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upgrade:
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Cython is no longer a build dependency of Qiskit Terra and is no longer
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required to be installed when building Qiskit Terra from source.
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