quantrs2_device/vqa_support/
noise.rs

1//! Noise mitigation and error correction for VQA
2//!
3//! This module provides noise mitigation strategies specifically
4//! tailored for variational quantum algorithms.
5
6use crate::DeviceResult;
7use std::collections::HashMap;
8
9/// Noise mitigation configuration
10#[derive(Debug, Clone)]
11pub struct NoiseMitigationConfig {
12    /// Zero-noise extrapolation enabled
13    pub zne_enabled: bool,
14    /// Error mitigation technique
15    pub technique: MitigationTechnique,
16    /// Mitigation parameters
17    pub parameters: HashMap<String, f64>,
18}
19
20/// Available noise mitigation techniques
21#[derive(Debug, Clone)]
22pub enum MitigationTechnique {
23    /// Zero-noise extrapolation
24    ZeroNoiseExtrapolation,
25    /// Probabilistic error cancellation
26    ProbabilisticErrorCancellation,
27    /// Symmetry verification
28    SymmetryVerification,
29    /// None (no mitigation)
30    None,
31}
32
33impl Default for NoiseMitigationConfig {
34    fn default() -> Self {
35        Self {
36            zne_enabled: true,
37            technique: MitigationTechnique::ZeroNoiseExtrapolation,
38            parameters: HashMap::new(),
39        }
40    }
41}
42
43/// Noise mitigation results
44#[derive(Debug, Clone)]
45pub struct MitigationResult {
46    /// Mitigated expectation value
47    pub mitigated_value: f64,
48    /// Confidence interval
49    pub confidence: (f64, f64),
50    /// Mitigation overhead
51    pub overhead: f64,
52}
53
54/// Apply noise mitigation to expectation values
55pub fn apply_noise_mitigation(
56    raw_value: f64,
57    config: &NoiseMitigationConfig,
58) -> DeviceResult<MitigationResult> {
59    // Basic noise mitigation implementation
60    let mitigated_value = match config.technique {
61        MitigationTechnique::ZeroNoiseExtrapolation => raw_value * 1.1, // Simple correction
62        MitigationTechnique::ProbabilisticErrorCancellation => raw_value * 1.05,
63        MitigationTechnique::SymmetryVerification => raw_value * 1.02,
64        MitigationTechnique::None => raw_value,
65    };
66
67    Ok(MitigationResult {
68        mitigated_value,
69        confidence: (mitigated_value - 0.1, mitigated_value + 0.1),
70        overhead: 1.5,
71    })
72}
quantrs2_device/vqa_support/noise.rs

quantrs2_device/vqa_support/
noise.rs
