mirror of https://github.com/Qiskit/qiskit.git
29 lines
1.6 KiB
YAML
29 lines
1.6 KiB
YAML
---
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features_circuits:
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Added a new function :func:`.quantum_volume` for generating a quantum volume
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:class:`.QuantumCircuit` object as defined in A. Cross et al. Validating quantum computers
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using randomized model circuits, Phys. Rev. A 100, 032328 (2019)
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`https://link.aps.org/doi/10.1103/PhysRevA.100.032328 <https://link.aps.org/doi/10.1103/PhysRevA.100.032328>`__.
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This new function differs from the existing :class:`.QuantumVolume` class in that it returns
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a :class:`.QuantumCircuit` object instead of building a subclass object. The second is
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that this new function is multithreaded and implemented in rust so it generates the output
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circuit ~10x faster than the :class:`.QuantumVolume` class.
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Improved the runtime performance of constructing the
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:class:`.QuantumVolume` class with the ``classical_permutation`` argument set
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to ``True``. Internally it now calls the :func:`.quantum_volume`
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function which is written in Rust which is ~10x faster to generate a
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quantum volume circuit.
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upgrade_circuits:
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The :class:`.QuantumVolume` class will generate circuits with
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different unitary matrices and permutations for a given seed value from
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the previous Qiskit release. This is due to using a new internal random
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number generator for the circuit generation that will generate the circuit
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more quickly. If you need an exact circuit with the same seed you can
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use the previous release of Qiskit and generate the circuit with the
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``flatten=True`` argument and export the circuit with :func:`.qpy.dump`
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and then load it with this release.
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