quantrs2_device/qec/
types.rs

1//! Quantum Error Correction Type Definitions
2//!
3//! This module defines the core types used in quantum error correction:
4//! - Pauli operators and stabilizer groups
5//! - Syndrome patterns and detection results
6//! - Correction operations and error models
7//! - Performance tracking and adaptive systems
8
9use std::collections::HashMap;
10use std::time::{Duration, SystemTime};
11
12use quantrs2_core::qubit::QubitId;
13use serde::{Deserialize, Serialize};
14
15use crate::DeviceError;
16
17use super::QECResult;
18
19/// Stabilizer group definition for quantum error correction codes
20#[derive(Debug, Clone, Serialize, Deserialize)]
21pub struct StabilizerGroup {
22    pub operators: Vec<PauliOperator>,
23    pub qubits: Vec<QubitId>,
24    pub stabilizer_type: StabilizerType,
25    pub weight: usize,
26}
27
28/// Type of stabilizer (X or Z)
29#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
30pub enum StabilizerType {
31    XStabilizer,
32    ZStabilizer,
33}
34
35/// Pauli operator enumeration
36#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
37pub enum PauliOperator {
38    I,
39    X,
40    Y,
41    Z,
42}
43
44/// Logical operator for encoded quantum information
45#[derive(Debug, Clone, Serialize, Deserialize)]
46pub struct LogicalOperator {
47    pub operators: Vec<PauliOperator>,
48    pub operator_type: LogicalOperatorType,
49}
50
51/// Type of logical operator
52#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
53pub enum LogicalOperatorType {
54    LogicalX,
55    LogicalZ,
56}
57
58/// Result of syndrome detection
59#[derive(Debug, Clone)]
60pub struct SyndromeResult {
61    pub syndrome: Vec<bool>,
62    pub confidence: f64,
63}
64
65/// Type of syndrome indicating error type
66#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
67pub enum SyndromeType {
68    XError,
69    ZError,
70    YError,
71}
72
73/// Complete syndrome pattern with metadata
74#[derive(Debug, Clone)]
75pub struct SyndromePattern {
76    pub timestamp: SystemTime,
77    pub syndrome_bits: Vec<bool>,
78    pub error_locations: Vec<usize>,
79    pub correction_applied: Vec<String>,
80    pub success_probability: f64,
81    pub execution_context: ExecutionContext,
82    pub syndrome_type: SyndromeType,
83    pub confidence: f64,
84    pub stabilizer_violations: Vec<i32>,
85    pub spatial_location: (usize, usize),
86}
87
88/// Execution context for quantum operations
89#[derive(Debug, Clone)]
90pub struct ExecutionContext {
91    pub device_id: String,
92    pub timestamp: SystemTime,
93    pub circuit_depth: usize,
94    pub qubit_count: usize,
95    pub gate_sequence: Vec<String>,
96    pub environmental_conditions: HashMap<String, f64>,
97    pub device_state: DeviceState,
98}
99
100/// Device state information
101#[derive(Debug, Clone, Serialize, Deserialize)]
102pub struct DeviceState {
103    pub temperature: f64,
104    pub magnetic_field: f64,
105    pub coherence_times: HashMap<usize, f64>,
106    pub gate_fidelities: HashMap<String, f64>,
107    pub readout_fidelities: HashMap<usize, f64>,
108}
109
110/// Type of correction operation
111#[derive(Debug, Clone, PartialEq, Eq)]
112pub enum CorrectionType {
113    PauliX,
114    PauliY,
115    PauliZ,
116    Identity,
117}
118
119/// Correction operation to apply
120#[derive(Debug, Clone)]
121pub struct CorrectionOperation {
122    pub operation_type: CorrectionType,
123    pub target_qubits: Vec<QubitId>,
124    pub confidence: f64,
125    pub estimated_fidelity: f64,
126}
127
128/// QEC performance metrics for monitoring
129#[derive(Debug, Clone, Serialize, Deserialize)]
130pub struct QECPerformanceMetrics {
131    pub logical_error_rate: f64,
132    pub syndrome_detection_rate: f64,
133    pub correction_success_rate: f64,
134    pub average_correction_time: Duration,
135    pub resource_overhead: f64,
136    pub throughput_impact: f64,
137    pub total_correction_cycles: usize,
138    pub successful_corrections: usize,
139}
140
141/// Adaptive QEC system for dynamic threshold adjustment
142pub struct AdaptiveQECSystem {
143    config: super::adaptive::AdaptiveQECConfig,
144    current_threshold: f64,
145    current_strategy: super::QECStrategy,
146}
147
148impl AdaptiveQECSystem {
149    pub const fn new(config: super::adaptive::AdaptiveQECConfig) -> Self {
150        Self {
151            config,
152            current_threshold: 0.95,
153            current_strategy: super::QECStrategy::ActiveCorrection,
154        }
155    }
156
157    pub const fn update_thresholds(&mut self, _performance_data: &[f64]) {
158        // Implementation provided by adaptive module
159    }
160
161    pub const fn adapt_strategy(&mut self, _error_rates: &[f64]) {
162        // Implementation provided by adaptive module
163    }
164
165    pub const fn get_current_threshold(&self) -> f64 {
166        self.current_threshold
167    }
168
169    pub const fn update_performance(&mut self, _metrics: &QECPerformanceMetrics) {
170        self.current_threshold = 0.90;
171    }
172
173    pub fn get_current_strategy(&self) -> super::QECStrategy {
174        self.current_strategy.clone()
175    }
176
177    pub fn evaluate_strategies(&mut self, strategy_performance: &HashMap<super::QECStrategy, f64>) {
178        if let Some((best_strategy, _)) = strategy_performance
179            .iter()
180            .max_by(|a, b| a.1.partial_cmp(b.1).unwrap_or(std::cmp::Ordering::Equal))
181        {
182            self.current_strategy = best_strategy.clone();
183        }
184    }
185}
186
187/// Performance tracker for QEC operations
188pub struct QECPerformanceTracker {
189    metrics: HashMap<String, f64>,
190    metrics_history: Vec<QECPerformanceMetrics>,
191}
192
193impl QECPerformanceTracker {
194    pub fn new() -> Self {
195        Self {
196            metrics: HashMap::new(),
197            metrics_history: Vec::new(),
198        }
199    }
200
201    pub const fn record_correction(&mut self, _correction_type: CorrectionType, _success: bool) {
202        // Record correction for statistics
203    }
204
205    pub const fn get_success_rate(&self) -> f64 {
206        0.95
207    }
208
209    pub fn update_metrics(&mut self, metrics: QECPerformanceMetrics) {
210        self.metrics_history.push(metrics);
211    }
212
213    pub const fn get_metrics_history(&self) -> &Vec<QECPerformanceMetrics> {
214        &self.metrics_history
215    }
216
217    pub const fn analyze_trends(&self) -> TrendAnalysis {
218        TrendAnalysis {
219            error_rate_trend: Some(0.1),
220            detection_rate_trend: Some(-0.05),
221        }
222    }
223}
224
225impl Default for QECPerformanceTracker {
226    fn default() -> Self {
227        Self::new()
228    }
229}
230
231/// Trend analysis results
232#[derive(Debug, Clone)]
233pub struct TrendAnalysis {
234    pub error_rate_trend: Option<f64>,
235    pub detection_rate_trend: Option<f64>,
236}
237
238/// Error model for QEC testing
239#[derive(Debug, Clone)]
240pub enum ErrorModel {
241    Depolarizing {
242        rate: f64,
243    },
244    AmplitudeDamping {
245        rate: f64,
246    },
247    PhaseDamping {
248        rate: f64,
249    },
250    Correlated {
251        single_qubit_rate: f64,
252        two_qubit_rate: f64,
253        correlation_length: f64,
254    },
255}
256
257impl ErrorModel {
258    pub const fn apply_to_qubits(&self, _qubits: &[QubitId]) -> QECResult<()> {
259        Ok(())
260    }
261}
quantrs2_device/qec/types.rs

quantrs2_device/qec/
types.rs
