quantrs2_device/photonic/
mod.rs

1//! Photonic quantum computing device interfaces
2//!
3//! This module provides support for photonic quantum computers, including
4//! continuous variable systems, gate-based photonic systems, and measurement-based
5//! quantum computing approaches.
6
7use crate::{CircuitExecutor, CircuitResult, DeviceError, DeviceResult, QuantumDevice};
8use quantrs2_circuit::prelude::Circuit;
9use serde::{Deserialize, Serialize};
10use std::collections::HashMap;
11use std::time::Duration;
12
13pub mod client;
14pub mod config;
15pub mod continuous_variable;
16pub mod cv_gates;
17pub mod device;
18pub mod encoding;
19pub mod error_correction;
20pub mod gate_based;
21pub mod measurement_based;
22pub mod noise_models;
23pub mod optimization;
24pub mod protocols;
25pub mod squeezed_states;
26
27pub use client::PhotonicClient;
28pub use config::{PhotonicConfig, PhotonicSystem};
29pub use device::PhotonicQuantumDeviceImpl;
30
31/// Types of photonic quantum computing systems
32#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
33pub enum PhotonicSystemType {
34    /// Continuous variable quantum computing
35    ContinuousVariable,
36    /// Gate-based photonic quantum computing
37    GateBased,
38    /// Measurement-based quantum computing (one-way quantum computing)
39    MeasurementBased,
40    /// Hybrid photonic-matter systems
41    Hybrid,
42}
43
44/// Photonic quantum computing modes
45#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
46pub enum PhotonicMode {
47    /// Position quadrature
48    Position,
49    /// Momentum quadrature
50    Momentum,
51    /// Number states (Fock states)
52    Number,
53    /// Coherent states
54    Coherent,
55    /// Squeezed states
56    Squeezed,
57    /// Cat states
58    Cat,
59}
60
61/// Configuration for photonic quantum devices
62#[derive(Debug, Clone, Serialize, Deserialize)]
63pub struct PhotonicDeviceConfig {
64    /// Type of photonic system
65    pub system_type: PhotonicSystemType,
66    /// Number of optical modes
67    pub mode_count: usize,
68    /// Cutoff dimension for Fock space truncation
69    pub cutoff_dimension: Option<usize>,
70    /// Squeezing parameter range
71    pub squeezing_range: Option<(f64, f64)>,
72    /// Loss rate per mode
73    pub loss_rate: Option<f64>,
74    /// Thermal photon number
75    pub thermal_photons: Option<f64>,
76    /// Detection efficiency
77    pub detection_efficiency: Option<f64>,
78    /// Gate fidelity
79    pub gate_fidelity: Option<f64>,
80    /// Measurement fidelity
81    pub measurement_fidelity: Option<f64>,
82    /// Maximum execution time
83    pub max_execution_time: Option<Duration>,
84    /// Enable hardware acceleration
85    pub hardware_acceleration: bool,
86    /// Custom hardware parameters
87    pub hardware_params: HashMap<String, String>,
88}
89
90impl Default for PhotonicDeviceConfig {
91    fn default() -> Self {
92        Self {
93            system_type: PhotonicSystemType::ContinuousVariable,
94            mode_count: 8,
95            cutoff_dimension: Some(10),
96            squeezing_range: Some((-2.0, 2.0)),
97            loss_rate: Some(0.01),
98            thermal_photons: Some(0.1),
99            detection_efficiency: Some(0.9),
100            gate_fidelity: Some(0.99),
101            measurement_fidelity: Some(0.95),
102            max_execution_time: Some(Duration::from_secs(300)),
103            hardware_acceleration: true,
104            hardware_params: HashMap::new(),
105        }
106    }
107}
108
109/// Result of photonic quantum circuit execution
110#[derive(Debug, Clone, Serialize, Deserialize)]
111pub struct PhotonicCircuitResult {
112    /// Standard circuit result
113    pub circuit_result: CircuitResult,
114    /// Photonic-specific results
115    pub photonic_data: PhotonicMeasurementData,
116    /// Execution metadata
117    pub execution_metadata: PhotonicExecutionMetadata,
118}
119
120/// Photonic measurement data
121#[derive(Debug, Clone, Serialize, Deserialize, Default)]
122pub struct PhotonicMeasurementData {
123    /// Quadrature measurements
124    pub quadratures: Vec<(f64, f64)>, // (x, p) pairs
125    /// Photon number measurements
126    pub photon_numbers: Vec<usize>,
127    /// Homodyne detection results
128    pub homodyne_results: Vec<f64>,
129    /// Heterodyne detection results
130    pub heterodyne_results: Vec<(f64, f64)>,
131    /// Correlation functions
132    pub correlations: HashMap<String, f64>,
133    /// Fidelity estimates
134    pub fidelities: HashMap<String, f64>,
135}
136
137/// Photonic execution metadata
138#[derive(Debug, Clone, Serialize, Deserialize)]
139pub struct PhotonicExecutionMetadata {
140    /// System type used
141    pub system_type: PhotonicSystemType,
142    /// Number of modes used
143    pub modes_used: usize,
144    /// Actual execution time
145    pub execution_time: Duration,
146    /// Loss rate during execution
147    pub measured_loss_rate: Option<f64>,
148    /// Thermal noise during execution
149    pub thermal_noise: Option<f64>,
150    /// Gate sequence applied
151    pub gate_sequence: Vec<String>,
152    /// Optimization applied
153    pub optimizations_applied: Vec<String>,
154}
155
156impl Default for PhotonicExecutionMetadata {
157    fn default() -> Self {
158        Self {
159            system_type: PhotonicSystemType::ContinuousVariable,
160            modes_used: 0,
161            execution_time: Duration::from_millis(0),
162            measured_loss_rate: None,
163            thermal_noise: None,
164            gate_sequence: Vec::new(),
165            optimizations_applied: Vec::new(),
166        }
167    }
168}
169
170/// Trait for photonic quantum devices
171#[async_trait::async_trait]
172pub trait PhotonicQuantumDevice: QuantumDevice + CircuitExecutor {
173    /// Get the photonic system type
174    async fn system_type(&self) -> DeviceResult<PhotonicSystemType>;
175
176    /// Get the number of optical modes
177    async fn mode_count(&self) -> DeviceResult<usize>;
178
179    /// Get the cutoff dimension for Fock space
180    async fn cutoff_dimension(&self) -> DeviceResult<Option<usize>>;
181
182    /// Check if continuous variable operations are supported
183    async fn supports_cv_operations(&self) -> DeviceResult<bool>;
184
185    /// Check if gate-based operations are supported
186    async fn supports_gate_based(&self) -> DeviceResult<bool>;
187
188    /// Check if measurement-based operations are supported
189    async fn supports_measurement_based(&self) -> DeviceResult<bool>;
190
191    /// Get supported quadrature measurement precision
192    async fn quadrature_precision(&self) -> DeviceResult<f64>;
193
194    /// Get photon detection efficiency
195    async fn detection_efficiency(&self) -> DeviceResult<f64>;
196
197    /// Execute a photonic circuit with detailed results
198    async fn execute_photonic_circuit<const N: usize>(
199        &self,
200        circuit: &Circuit<N>,
201        shots: usize,
202        config: Option<PhotonicDeviceConfig>,
203    ) -> DeviceResult<PhotonicCircuitResult>;
204
205    /// Perform quadrature measurements
206    async fn measure_quadratures(
207        &self,
208        modes: &[usize],
209        angles: &[f64],
210    ) -> DeviceResult<Vec<(f64, f64)>>;
211
212    /// Perform photon number measurements
213    async fn measure_photon_numbers(&self, modes: &[usize]) -> DeviceResult<Vec<usize>>;
214
215    /// Perform homodyne detection
216    async fn homodyne_detection(
217        &self,
218        mode: usize,
219        phase: f64,
220        shots: usize,
221    ) -> DeviceResult<Vec<f64>>;
222
223    /// Perform heterodyne detection
224    async fn heterodyne_detection(
225        &self,
226        mode: usize,
227        shots: usize,
228    ) -> DeviceResult<Vec<(f64, f64)>>;
229
230    /// Calculate correlation functions
231    async fn calculate_correlations(
232        &self,
233        modes: &[(usize, usize)],
234        correlation_type: &str,
235    ) -> DeviceResult<HashMap<String, f64>>;
236
237    /// Estimate state fidelity
238    async fn estimate_fidelity(
239        &self,
240        target_state: &str,
241        measurement_data: &PhotonicMeasurementData,
242    ) -> DeviceResult<f64>;
243}
244
245/// Create a photonic quantum device
246pub async fn create_photonic_device(
247    client: PhotonicClient,
248    config: PhotonicDeviceConfig,
249) -> DeviceResult<impl PhotonicQuantumDevice> {
250    PhotonicQuantumDeviceImpl::new("default_photonic_device".to_string(), client, config).await
251}
252
253/// Validate photonic device configuration
254pub fn validate_photonic_config(config: &PhotonicDeviceConfig) -> DeviceResult<()> {
255    if config.mode_count == 0 {
256        return Err(DeviceError::InvalidInput(
257            "Mode count must be greater than 0".to_string(),
258        ));
259    }
260
261    if let Some(cutoff) = config.cutoff_dimension {
262        if cutoff == 0 {
263            return Err(DeviceError::InvalidInput(
264                "Cutoff dimension must be greater than 0".to_string(),
265            ));
266        }
267    }
268
269    if let Some((min_squeeze, max_squeeze)) = config.squeezing_range {
270        if min_squeeze >= max_squeeze {
271            return Err(DeviceError::InvalidInput(
272                "Invalid squeezing range: min must be less than max".to_string(),
273            ));
274        }
275    }
276
277    if let Some(loss_rate) = config.loss_rate {
278        if !(0.0..=1.0).contains(&loss_rate) {
279            return Err(DeviceError::InvalidInput(
280                "Loss rate must be between 0 and 1".to_string(),
281            ));
282        }
283    }
284
285    if let Some(efficiency) = config.detection_efficiency {
286        if !(0.0..=1.0).contains(&efficiency) {
287            return Err(DeviceError::InvalidInput(
288                "Detection efficiency must be between 0 and 1".to_string(),
289            ));
290        }
291    }
292
293    Ok(())
294}
295
296/// Photonic gate operations
297pub mod gates {
298    use super::*;
299
300    /// Displacement gate parameters
301    #[derive(Debug, Clone, Serialize, Deserialize)]
302    pub struct DisplacementGate {
303        pub alpha: f64,  // Displacement amplitude
304        pub phi: f64,    // Displacement phase
305        pub mode: usize, // Target mode
306    }
307
308    /// Squeezing gate parameters
309    #[derive(Debug, Clone, Serialize, Deserialize)]
310    pub struct SqueezingGate {
311        pub r: f64,      // Squeezing parameter
312        pub phi: f64,    // Squeezing angle
313        pub mode: usize, // Target mode
314    }
315
316    /// Two-mode squeezing gate parameters
317    #[derive(Debug, Clone, Serialize, Deserialize)]
318    pub struct TwoModeSqueezingGate {
319        pub r: f64,       // Squeezing parameter
320        pub phi: f64,     // Squeezing phase
321        pub mode1: usize, // First mode
322        pub mode2: usize, // Second mode
323    }
324
325    /// Beamsplitter gate parameters
326    #[derive(Debug, Clone, Serialize, Deserialize)]
327    pub struct BeamsplitterGate {
328        pub theta: f64,   // Transmission angle
329        pub phi: f64,     // Phase
330        pub mode1: usize, // First mode
331        pub mode2: usize, // Second mode
332    }
333
334    /// Phase rotation gate parameters
335    #[derive(Debug, Clone, Serialize, Deserialize)]
336    pub struct PhaseRotationGate {
337        pub phi: f64,    // Rotation angle
338        pub mode: usize, // Target mode
339    }
340
341    /// Kerr gate parameters (non-linear)
342    #[derive(Debug, Clone, Serialize, Deserialize)]
343    pub struct KerrGate {
344        pub kappa: f64,  // Kerr parameter
345        pub mode: usize, // Target mode
346    }
347
348    /// Cross-Kerr gate parameters
349    #[derive(Debug, Clone, Serialize, Deserialize)]
350    pub struct CrossKerrGate {
351        pub kappa: f64,   // Cross-Kerr parameter
352        pub mode1: usize, // First mode
353        pub mode2: usize, // Second mode
354    }
355}
356
357#[cfg(test)]
358mod tests {
359    use super::*;
360
361    #[test]
362    fn test_photonic_config_validation() {
363        let valid_config = PhotonicDeviceConfig::default();
364        assert!(validate_photonic_config(&valid_config).is_ok());
365
366        let invalid_config = PhotonicDeviceConfig {
367            mode_count: 0,
368            ..Default::default()
369        };
370        assert!(validate_photonic_config(&invalid_config).is_err());
371    }
372
373    #[test]
374    fn test_photonic_system_types() {
375        let cv_system = PhotonicSystemType::ContinuousVariable;
376        assert_eq!(cv_system, PhotonicSystemType::ContinuousVariable);
377
378        let gb_system = PhotonicSystemType::GateBased;
379        assert_eq!(gb_system, PhotonicSystemType::GateBased);
380    }
381
382    #[test]
383    fn test_photonic_modes() {
384        let position_mode = PhotonicMode::Position;
385        assert_eq!(position_mode, PhotonicMode::Position);
386
387        let squeezed_mode = PhotonicMode::Squeezed;
388        assert_eq!(squeezed_mode, PhotonicMode::Squeezed);
389    }
390}
quantrs2_device/photonic/mod.rs

quantrs2_device/photonic/
mod.rs
