Struct ZeroNoiseExtrapolation 

pub struct ZeroNoiseExtrapolation { /* private fields */ }

Zero-Noise Extrapolation for error mitigation.

Runs circuits at multiple noise levels and extrapolates to the zero-noise limit.

Example

use logosq_error_mitigator::{ZeroNoiseExtrapolation, Extrapolator};

let zne = ZeroNoiseExtrapolation::new()
    .with_scale_factors(&[1.0, 2.0, 3.0])
    .with_extrapolator(Extrapolator::Polynomial { degree: 2 });

let data = vec![(1.0, -0.85), (2.0, -0.72), (3.0, -0.58)];
let mitigated = zne.extrapolate(&data).unwrap();

Implementations

impl ZeroNoiseExtrapolation

pub fn new() -> Self

Create a new ZNE mitigator with default settings.

pub fn with_scale_factors(self, factors: &[f64]) -> Self

Set the noise scale factors.

Arguments

• factors - Scale factors (must all be >= 1.0)

pub fn with_extrapolator(self, extrapolator: Extrapolator) -> Self

Set the extrapolation method.

pub fn with_noise_scaling(self, scaling: NoiseScaling) -> Self

Set the noise scaling method.

pub fn extrapolate(&self, data: &[(f64, f64)]) -> Result<f64, MitigationError>

Extrapolate to zero noise from measured data.

Arguments

• data - Pairs of (scale_factor, expectation_value)

Returns

The extrapolated zero-noise expectation value.

pub fn scale_factors(&self) -> &[f64]

Get the scale factors.

Trait Implementations

impl Clone for ZeroNoiseExtrapolation

fn clone(&self) -> ZeroNoiseExtrapolation

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ZeroNoiseExtrapolation

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ZeroNoiseExtrapolation

fn default() -> Self

Returns the “default value” for a type.

impl MitigationTechnique for ZeroNoiseExtrapolation

fn mitigate_expectation(&self, _value: f64) -> Result<f64, MitigationError>

Apply mitigation to an expectation value.

fn mitigate_counts( &self, counts: &HashMap<String, u64>, ) -> Result<HashMap<String, f64>, MitigationError>

Apply mitigation to measurement counts.

fn name(&self) -> &str

Get the name of this technique.

fn overhead(&self) -> f64

Get the sampling overhead factor.