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Publish sample Z phase errors (#5378)
This PR adds Z phase angles for sqrt-ISWAP gates and tools for accessing them. Follow-up to #5364. Z phase angles are captured in a different calibration process than the other error metrics, and thus require a slightly different pipeline to access them. Key points to note about this data: - This only includes zeta and gamma, as theta and phi already appear in the QCS metrics and chi is not currently captured by any calibration process we use. - Qubit (6, 1) was in a bad state when the Weber data was taken, and thus has no Z phase angles in the sample data. The pipeline will treat this as zeta=gamma=0 for gates touching this qubit.
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‎cirq-google/cirq_google/devices/calibrations/rainbow_2021_08_26_zphase.json

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