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Correct QVFitter confidence level threshold to 0.977 (#482)
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features: | ||
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Add two methods to :class:`qiskit.ignis.verification.quantum_volume.QVFitter`. | ||
* :meth:`qiskit.ignis.verification.quantum_volume.QVFitter.calc_z_value` to calculate z value in standard normal distribution using mean and standard deviation sigma. If sigma = 0, it raises a warning and assigns a small value (1e-10) for sigma so that the code still runs. | ||
* :meth:`qiskit.ignis.verification.quantum_volume.QVFitter.calc_confidence_level` to calculate confidence level using z value. | ||
- | | ||
Store confidence level even when hmean < 2/3 in :meth:`qiskit.ignis.verification.quantum_volume.QVFitter.qv_success`. | ||
- | | ||
Add explanations for how to calculate statistics based on binomial distribution in :meth:`qiskit.ignis.verification.quantum_volume.QVFitter.calc_statistics`. | ||
fixes: | ||
- | | ||
Fix the confidence level threshold for :meth:`qiskit.ignis.verification.quantum_volume.QVFitter.qv_success` to 0.977 corresponding to z = 2 as defined by the QV paper Algorithm 1. |