cirq_google.engine.noise_properties_from_calibration

Translates between cirq_google.Calibration and NoiseProperties.

cirq_google.engine.noise_properties_from_calibration(
    calibration: engine.Calibration,
    *,
    gate_times_ns: (dict[type[cirq.Gate], float] | Literal['legacy'] | None) = None,
    zphase_data: (util.ZPhaseDataType | None) = None
) -> google_noise_properties.GoogleNoiseProperties

The NoiseProperties object can then be used as input to the cirq_google.NoiseModelFromGoogleNoiseProperties class to create a cirq.NoiseModel that can be used with a simulator.

To manually override noise properties, call with_params on the output:

<pre class="devsite-click-to-copy prettyprint lang-py">
<code class="devsite-terminal" data-terminal-prefix="&gt;&gt;&gt;">cal = cirq_google.engine.load_median_device_calibration(&quot;rainbow&quot;)</code>
<code class="devsite-terminal" data-terminal-prefix="&gt;&gt;&gt;">noise_props = cirq_google.engine.noise_properties_from_calibration(</code>
<code class="devsite-terminal" data-terminal-prefix="...">    cal, gate_times_ns=&quot;legacy&quot;)</code>
<code class="devsite-terminal" data-terminal-prefix="&gt;&gt;&gt;"># noise_props with all gate durations set to 37ns.</code>
<code class="devsite-terminal" data-terminal-prefix="&gt;&gt;&gt;">noise_props_37ns = noise_props.with_params(gate_times_ns=37)</code>
<code class="no-select nocode">    </code>
</pre>

See cirq_google.GoogleNoiseProperties for details.

calibration a Calibration object with hardware metrics.
gate_times_ns Map of gate durations in nanoseconds or "legacy" to use the Sycamore gate times listed in known_devices.py. Note this argument has changed from optional to mandatory and the "legacy" value was added as an alias for the old default.
zphase_data Optional data for Z phases not captured by Calibration - specifically, zeta and gamma. These values require Floquet calibration and can be provided here if available.

A cirq_google.GoogleNoiseProperties which represents the error present in the given Calibration object.