microsoft/qdk
Publicmirrored fromhttps://github.com/microsoft/qdkAvailable
compiler/qsc_eval/src/backend.rs
622lines · modecode
| 1 | // Copyright (c) Microsoft Corporation. |
| 2 | // Licensed under the MIT License. |
| 3 | |
| 4 | use crate::noise::PauliNoise; |
| 5 | use crate::val::Value; |
| 6 | use num_bigint::BigUint; |
| 7 | use num_complex::Complex; |
| 8 | use quantum_sparse_sim::QuantumSim; |
| 9 | use rand::{rngs::StdRng, Rng, RngCore, SeedableRng}; |
| 10 | |
| 11 | #[cfg(test)] |
| 12 | mod noise_tests; |
| 13 | |
| 14 | /// The trait that must be implemented by a quantum backend, whose functions will be invoked when |
| 15 | /// quantum intrinsics are called. |
| 16 | pub trait Backend { |
| 17 | type ResultType; |
| 18 | |
| 19 | fn ccx(&mut self, _ctl0: usize, _ctl1: usize, _q: usize) { |
| 20 | unimplemented!("ccx gate"); |
| 21 | } |
| 22 | fn cx(&mut self, _ctl: usize, _q: usize) { |
| 23 | unimplemented!("cx gate"); |
| 24 | } |
| 25 | fn cy(&mut self, _ctl: usize, _q: usize) { |
| 26 | unimplemented!("cy gate"); |
| 27 | } |
| 28 | fn cz(&mut self, _ctl: usize, _q: usize) { |
| 29 | unimplemented!("cz gate"); |
| 30 | } |
| 31 | fn h(&mut self, _q: usize) { |
| 32 | unimplemented!("h gate"); |
| 33 | } |
| 34 | fn m(&mut self, _q: usize) -> Self::ResultType { |
| 35 | unimplemented!("m operation"); |
| 36 | } |
| 37 | fn mresetz(&mut self, _q: usize) -> Self::ResultType { |
| 38 | unimplemented!("mresetz operation"); |
| 39 | } |
| 40 | fn reset(&mut self, _q: usize) { |
| 41 | unimplemented!("reset gate"); |
| 42 | } |
| 43 | fn rx(&mut self, _theta: f64, _q: usize) { |
| 44 | unimplemented!("rx gate"); |
| 45 | } |
| 46 | fn rxx(&mut self, _theta: f64, _q0: usize, _q1: usize) { |
| 47 | unimplemented!("rxx gate"); |
| 48 | } |
| 49 | fn ry(&mut self, _theta: f64, _q: usize) { |
| 50 | unimplemented!("ry gate"); |
| 51 | } |
| 52 | fn ryy(&mut self, _theta: f64, _q0: usize, _q1: usize) { |
| 53 | unimplemented!("ryy gate"); |
| 54 | } |
| 55 | fn rz(&mut self, _theta: f64, _q: usize) { |
| 56 | unimplemented!("rz gate"); |
| 57 | } |
| 58 | fn rzz(&mut self, _theta: f64, _q0: usize, _q1: usize) { |
| 59 | unimplemented!("rzz gate"); |
| 60 | } |
| 61 | fn sadj(&mut self, _q: usize) { |
| 62 | unimplemented!("sadj gate"); |
| 63 | } |
| 64 | fn s(&mut self, _q: usize) { |
| 65 | unimplemented!("s gate"); |
| 66 | } |
| 67 | fn swap(&mut self, _q0: usize, _q1: usize) { |
| 68 | unimplemented!("swap gate"); |
| 69 | } |
| 70 | fn tadj(&mut self, _q: usize) { |
| 71 | unimplemented!("tadj gate"); |
| 72 | } |
| 73 | fn t(&mut self, _q: usize) { |
| 74 | unimplemented!("t gate"); |
| 75 | } |
| 76 | fn x(&mut self, _q: usize) { |
| 77 | unimplemented!("x gate"); |
| 78 | } |
| 79 | fn y(&mut self, _q: usize) { |
| 80 | unimplemented!("y gate"); |
| 81 | } |
| 82 | fn z(&mut self, _q: usize) { |
| 83 | unimplemented!("z gate"); |
| 84 | } |
| 85 | fn qubit_allocate(&mut self) -> usize { |
| 86 | unimplemented!("qubit_allocate operation"); |
| 87 | } |
| 88 | /// `false` indicates that the qubit was in a non-zero state before the release, |
| 89 | /// but should have been in the zero state. |
| 90 | /// `true` otherwise. This includes the case when the qubit was in |
| 91 | /// a non-zero state during a noisy simulation, which is allowed. |
| 92 | fn qubit_release(&mut self, _q: usize) -> bool { |
| 93 | unimplemented!("qubit_release operation"); |
| 94 | } |
| 95 | fn qubit_swap_id(&mut self, _q0: usize, _q1: usize) { |
| 96 | unimplemented!("qubit_swap_id operation"); |
| 97 | } |
| 98 | fn capture_quantum_state(&mut self) -> (Vec<(BigUint, Complex<f64>)>, usize) { |
| 99 | unimplemented!("capture_quantum_state operation"); |
| 100 | } |
| 101 | fn qubit_is_zero(&mut self, _q: usize) -> bool { |
| 102 | unimplemented!("qubit_is_zero operation"); |
| 103 | } |
| 104 | /// Executes custom intrinsic specified by `_name`. |
| 105 | /// Returns None if this intrinsic is unknown. |
| 106 | /// Otherwise returns Some(Result), with the Result from intrinsic. |
| 107 | fn custom_intrinsic(&mut self, _name: &str, _arg: Value) -> Option<Result<Value, String>> { |
| 108 | None |
| 109 | } |
| 110 | fn set_seed(&mut self, _seed: Option<u64>) {} |
| 111 | } |
| 112 | |
| 113 | /// Default backend used when targeting sparse simulation. |
| 114 | pub struct SparseSim { |
| 115 | /// Noiseless Sparse simulator to be used by this instance. |
| 116 | pub sim: QuantumSim, |
| 117 | /// Pauli noise that is applied after a gate or before a measurement is executed. |
| 118 | /// Service functions aren't subject to noise. |
| 119 | pub noise: PauliNoise, |
| 120 | /// Random number generator to sample Pauli noise. |
| 121 | /// Noise is not applied when rng is None. |
| 122 | pub rng: Option<StdRng>, |
| 123 | } |
| 124 | |
| 125 | impl Default for SparseSim { |
| 126 | fn default() -> Self { |
| 127 | Self::new() |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | impl SparseSim { |
| 132 | #[must_use] |
| 133 | pub fn new() -> Self { |
| 134 | Self { |
| 135 | sim: QuantumSim::new(None), |
| 136 | noise: PauliNoise::default(), |
| 137 | rng: None, |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | #[must_use] |
| 142 | pub fn new_with_noise(noise: &PauliNoise) -> Self { |
| 143 | let mut sim = SparseSim::new(); |
| 144 | sim.set_noise(noise); |
| 145 | sim |
| 146 | } |
| 147 | |
| 148 | fn set_noise(&mut self, noise: &PauliNoise) { |
| 149 | self.noise = *noise; |
| 150 | if noise.is_noiseless() { |
| 151 | self.rng = None; |
| 152 | } else { |
| 153 | self.rng = Some(StdRng::from_entropy()); |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | #[must_use] |
| 158 | fn is_noiseless(&self) -> bool { |
| 159 | self.rng.is_none() |
| 160 | } |
| 161 | |
| 162 | fn apply_noise(&mut self, q: usize) { |
| 163 | if let Some(rng) = &mut self.rng { |
| 164 | let p = rng.gen_range(0.0..1.0); |
| 165 | if p >= self.noise.distribution[2] { |
| 166 | // In the most common case we don't apply noise |
| 167 | } else if p < self.noise.distribution[0] { |
| 168 | self.sim.x(q); |
| 169 | } else if p < self.noise.distribution[1] { |
| 170 | self.sim.y(q); |
| 171 | } else { |
| 172 | self.sim.z(q); |
| 173 | } |
| 174 | } |
| 175 | // No noise applied if rng is None. |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | impl Backend for SparseSim { |
| 180 | type ResultType = bool; |
| 181 | |
| 182 | fn ccx(&mut self, ctl0: usize, ctl1: usize, q: usize) { |
| 183 | self.sim.mcx(&[ctl0, ctl1], q); |
| 184 | self.apply_noise(ctl0); |
| 185 | self.apply_noise(ctl1); |
| 186 | self.apply_noise(q); |
| 187 | } |
| 188 | |
| 189 | fn cx(&mut self, ctl: usize, q: usize) { |
| 190 | self.sim.mcx(&[ctl], q); |
| 191 | self.apply_noise(ctl); |
| 192 | self.apply_noise(q); |
| 193 | } |
| 194 | |
| 195 | fn cy(&mut self, ctl: usize, q: usize) { |
| 196 | self.sim.mcy(&[ctl], q); |
| 197 | self.apply_noise(ctl); |
| 198 | self.apply_noise(q); |
| 199 | } |
| 200 | |
| 201 | fn cz(&mut self, ctl: usize, q: usize) { |
| 202 | self.sim.mcz(&[ctl], q); |
| 203 | self.apply_noise(ctl); |
| 204 | self.apply_noise(q); |
| 205 | } |
| 206 | |
| 207 | fn h(&mut self, q: usize) { |
| 208 | self.sim.h(q); |
| 209 | self.apply_noise(q); |
| 210 | } |
| 211 | |
| 212 | fn m(&mut self, q: usize) -> Self::ResultType { |
| 213 | self.apply_noise(q); |
| 214 | self.sim.measure(q) |
| 215 | } |
| 216 | |
| 217 | fn mresetz(&mut self, q: usize) -> Self::ResultType { |
| 218 | self.apply_noise(q); // Applying noise before measurement |
| 219 | let res = self.sim.measure(q); |
| 220 | if res { |
| 221 | self.sim.x(q); |
| 222 | } |
| 223 | self.apply_noise(q); // Applying noise after reset |
| 224 | res |
| 225 | } |
| 226 | |
| 227 | fn reset(&mut self, q: usize) { |
| 228 | self.mresetz(q); |
| 229 | // Noise applied in mresetz. |
| 230 | } |
| 231 | |
| 232 | fn rx(&mut self, theta: f64, q: usize) { |
| 233 | self.sim.rx(theta, q); |
| 234 | self.apply_noise(q); |
| 235 | } |
| 236 | |
| 237 | fn rxx(&mut self, theta: f64, q0: usize, q1: usize) { |
| 238 | self.sim.h(q0); |
| 239 | self.sim.h(q1); |
| 240 | self.sim.mcx(&[q1], q0); |
| 241 | self.sim.rz(theta, q0); |
| 242 | self.sim.mcx(&[q1], q0); |
| 243 | self.sim.h(q1); |
| 244 | self.sim.h(q0); |
| 245 | self.apply_noise(q0); |
| 246 | self.apply_noise(q1); |
| 247 | } |
| 248 | |
| 249 | fn ry(&mut self, theta: f64, q: usize) { |
| 250 | self.sim.ry(theta, q); |
| 251 | self.apply_noise(q); |
| 252 | } |
| 253 | |
| 254 | fn ryy(&mut self, theta: f64, q0: usize, q1: usize) { |
| 255 | self.sim.h(q0); |
| 256 | self.sim.s(q0); |
| 257 | self.sim.h(q0); |
| 258 | self.sim.h(q1); |
| 259 | self.sim.s(q1); |
| 260 | self.sim.h(q1); |
| 261 | self.sim.mcx(&[q1], q0); |
| 262 | self.sim.rz(theta, q0); |
| 263 | self.sim.mcx(&[q1], q0); |
| 264 | self.sim.h(q1); |
| 265 | self.sim.sadj(q1); |
| 266 | self.sim.h(q1); |
| 267 | self.sim.h(q0); |
| 268 | self.sim.sadj(q0); |
| 269 | self.sim.h(q0); |
| 270 | self.apply_noise(q0); |
| 271 | self.apply_noise(q1); |
| 272 | } |
| 273 | |
| 274 | fn rz(&mut self, theta: f64, q: usize) { |
| 275 | self.sim.rz(theta, q); |
| 276 | self.apply_noise(q); |
| 277 | } |
| 278 | |
| 279 | fn rzz(&mut self, theta: f64, q0: usize, q1: usize) { |
| 280 | self.sim.mcx(&[q1], q0); |
| 281 | self.sim.rz(theta, q0); |
| 282 | self.sim.mcx(&[q1], q0); |
| 283 | self.apply_noise(q0); |
| 284 | self.apply_noise(q1); |
| 285 | } |
| 286 | |
| 287 | fn sadj(&mut self, q: usize) { |
| 288 | self.sim.sadj(q); |
| 289 | self.apply_noise(q); |
| 290 | } |
| 291 | |
| 292 | fn s(&mut self, q: usize) { |
| 293 | self.sim.s(q); |
| 294 | self.apply_noise(q); |
| 295 | } |
| 296 | |
| 297 | fn swap(&mut self, q0: usize, q1: usize) { |
| 298 | self.sim.swap_qubit_ids(q0, q1); |
| 299 | self.apply_noise(q0); |
| 300 | self.apply_noise(q1); |
| 301 | } |
| 302 | |
| 303 | fn tadj(&mut self, q: usize) { |
| 304 | self.sim.tadj(q); |
| 305 | self.apply_noise(q); |
| 306 | } |
| 307 | |
| 308 | fn t(&mut self, q: usize) { |
| 309 | self.sim.t(q); |
| 310 | self.apply_noise(q); |
| 311 | } |
| 312 | |
| 313 | fn x(&mut self, q: usize) { |
| 314 | self.sim.x(q); |
| 315 | self.apply_noise(q); |
| 316 | } |
| 317 | |
| 318 | fn y(&mut self, q: usize) { |
| 319 | self.sim.y(q); |
| 320 | self.apply_noise(q); |
| 321 | } |
| 322 | |
| 323 | fn z(&mut self, q: usize) { |
| 324 | self.sim.z(q); |
| 325 | self.apply_noise(q); |
| 326 | } |
| 327 | |
| 328 | fn qubit_allocate(&mut self) -> usize { |
| 329 | // Fresh qubit start in ground state even with noise. |
| 330 | self.sim.allocate() |
| 331 | } |
| 332 | |
| 333 | fn qubit_release(&mut self, q: usize) -> bool { |
| 334 | if self.is_noiseless() { |
| 335 | let was_zero = self.sim.qubit_is_zero(q); |
| 336 | self.sim.release(q); |
| 337 | was_zero |
| 338 | } else { |
| 339 | self.sim.release(q); |
| 340 | true |
| 341 | } |
| 342 | } |
| 343 | |
| 344 | fn qubit_swap_id(&mut self, q0: usize, q1: usize) { |
| 345 | // This is a service function rather than a gate so it doesn't incur noise. |
| 346 | self.sim.swap_qubit_ids(q0, q1); |
| 347 | } |
| 348 | |
| 349 | fn capture_quantum_state(&mut self) -> (Vec<(BigUint, Complex<f64>)>, usize) { |
| 350 | let (state, count) = self.sim.get_state(); |
| 351 | // Because the simulator returns the state indices with opposite endianness from the |
| 352 | // expected one, we need to reverse the bit order of the indices. |
| 353 | let mut new_state = state |
| 354 | .into_iter() |
| 355 | .map(|(idx, val)| { |
| 356 | let mut new_idx = BigUint::default(); |
| 357 | for i in 0..(count as u64) { |
| 358 | if idx.bit((count as u64) - 1 - i) { |
| 359 | new_idx.set_bit(i, true); |
| 360 | } |
| 361 | } |
| 362 | (new_idx, val) |
| 363 | }) |
| 364 | .collect::<Vec<_>>(); |
| 365 | new_state.sort_unstable_by(|a, b| a.0.cmp(&b.0)); |
| 366 | (new_state, count) |
| 367 | } |
| 368 | |
| 369 | fn qubit_is_zero(&mut self, q: usize) -> bool { |
| 370 | // This is a service function rather than a measurement so it doesn't incur noise. |
| 371 | self.sim.qubit_is_zero(q) |
| 372 | } |
| 373 | |
| 374 | fn custom_intrinsic(&mut self, name: &str, arg: Value) -> Option<Result<Value, String>> { |
| 375 | // These intrinsics aren't subject to noise. |
| 376 | match name { |
| 377 | "GlobalPhase" => { |
| 378 | // Apply a global phase to the simulation by doing an Rz to a fresh qubit. |
| 379 | // The controls list may be empty, in which case the phase is applied unconditionally. |
| 380 | let [ctls_val, theta] = &*arg.unwrap_tuple() else { |
| 381 | panic!("tuple arity for GlobalPhase intrinsic should be 2"); |
| 382 | }; |
| 383 | let ctls = ctls_val |
| 384 | .clone() |
| 385 | .unwrap_array() |
| 386 | .iter() |
| 387 | .map(|q| q.clone().unwrap_qubit().0) |
| 388 | .collect::<Vec<_>>(); |
| 389 | let q = self.sim.allocate(); |
| 390 | // The new qubit is by-definition in the |0⟩ state, so by reversing the sign of the |
| 391 | // angle we can apply the phase to the entire state without increasing its size in memory. |
| 392 | self.sim |
| 393 | .mcrz(&ctls, -2.0 * theta.clone().unwrap_double(), q); |
| 394 | self.sim.release(q); |
| 395 | Some(Ok(Value::unit())) |
| 396 | } |
| 397 | "BeginEstimateCaching" => Some(Ok(Value::Bool(true))), |
| 398 | "EndEstimateCaching" |
| 399 | | "AccountForEstimatesInternal" |
| 400 | | "BeginRepeatEstimatesInternal" |
| 401 | | "EndRepeatEstimatesInternal" => Some(Ok(Value::unit())), |
| 402 | "ConfigurePauliNoise" => { |
| 403 | let [xv, yv, zv] = &*arg.unwrap_tuple() else { |
| 404 | panic!("tuple arity for ConfigurePauliNoise intrinsic should be 3"); |
| 405 | }; |
| 406 | let px = xv.get_double(); |
| 407 | let py = yv.get_double(); |
| 408 | let pz = zv.get_double(); |
| 409 | match PauliNoise::from_probabilities(px, py, pz) { |
| 410 | Ok(noise) => { |
| 411 | self.set_noise(&noise); |
| 412 | Some(Ok(Value::unit())) |
| 413 | } |
| 414 | Err(message) => Some(Err(message)), |
| 415 | } |
| 416 | } |
| 417 | "ApplyIdleNoise" => { |
| 418 | let q = arg.unwrap_qubit().0; |
| 419 | self.apply_noise(q); |
| 420 | Some(Ok(Value::unit())) |
| 421 | } |
| 422 | _ => None, |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | fn set_seed(&mut self, seed: Option<u64>) { |
| 427 | if let Some(seed) = seed { |
| 428 | if !self.is_noiseless() { |
| 429 | self.rng = Some(StdRng::seed_from_u64(seed)); |
| 430 | } |
| 431 | self.sim.set_rng_seed(seed); |
| 432 | } else { |
| 433 | if !self.is_noiseless() { |
| 434 | self.rng = Some(StdRng::from_entropy()); |
| 435 | } |
| 436 | self.sim.set_rng_seed(rand::thread_rng().next_u64()); |
| 437 | } |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | /// Simple struct that chains two backends together so that the chained |
| 442 | /// backend is called before the main backend. |
| 443 | /// For any intrinsics that return a value, |
| 444 | /// the value returned by the chained backend is ignored. |
| 445 | /// The value returned by the main backend is returned. |
| 446 | pub struct Chain<T1, T2> { |
| 447 | pub main: T1, |
| 448 | pub chained: T2, |
| 449 | } |
| 450 | |
| 451 | impl<T1, T2> Chain<T1, T2> |
| 452 | where |
| 453 | T1: Backend, |
| 454 | T2: Backend, |
| 455 | { |
| 456 | pub fn new(primary: T1, chained: T2) -> Chain<T1, T2> { |
| 457 | Chain { |
| 458 | main: primary, |
| 459 | chained, |
| 460 | } |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | impl<T1, T2> Backend for Chain<T1, T2> |
| 465 | where |
| 466 | T1: Backend, |
| 467 | T2: Backend, |
| 468 | { |
| 469 | type ResultType = T1::ResultType; |
| 470 | |
| 471 | fn ccx(&mut self, ctl0: usize, ctl1: usize, q: usize) { |
| 472 | self.chained.ccx(ctl0, ctl1, q); |
| 473 | self.main.ccx(ctl0, ctl1, q); |
| 474 | } |
| 475 | |
| 476 | fn cx(&mut self, ctl: usize, q: usize) { |
| 477 | self.chained.cx(ctl, q); |
| 478 | self.main.cx(ctl, q); |
| 479 | } |
| 480 | |
| 481 | fn cy(&mut self, ctl: usize, q: usize) { |
| 482 | self.chained.cy(ctl, q); |
| 483 | self.main.cy(ctl, q); |
| 484 | } |
| 485 | |
| 486 | fn cz(&mut self, ctl: usize, q: usize) { |
| 487 | self.chained.cz(ctl, q); |
| 488 | self.main.cz(ctl, q); |
| 489 | } |
| 490 | |
| 491 | fn h(&mut self, q: usize) { |
| 492 | self.chained.h(q); |
| 493 | self.main.h(q); |
| 494 | } |
| 495 | |
| 496 | fn m(&mut self, q: usize) -> Self::ResultType { |
| 497 | let _ = self.chained.m(q); |
| 498 | self.main.m(q) |
| 499 | } |
| 500 | |
| 501 | fn mresetz(&mut self, q: usize) -> Self::ResultType { |
| 502 | let _ = self.chained.mresetz(q); |
| 503 | self.main.mresetz(q) |
| 504 | } |
| 505 | |
| 506 | fn reset(&mut self, q: usize) { |
| 507 | self.chained.reset(q); |
| 508 | self.main.reset(q); |
| 509 | } |
| 510 | |
| 511 | fn rx(&mut self, theta: f64, q: usize) { |
| 512 | self.chained.rx(theta, q); |
| 513 | self.main.rx(theta, q); |
| 514 | } |
| 515 | |
| 516 | fn rxx(&mut self, theta: f64, q0: usize, q1: usize) { |
| 517 | self.chained.rxx(theta, q0, q1); |
| 518 | self.main.rxx(theta, q0, q1); |
| 519 | } |
| 520 | |
| 521 | fn ry(&mut self, theta: f64, q: usize) { |
| 522 | self.chained.ry(theta, q); |
| 523 | self.main.ry(theta, q); |
| 524 | } |
| 525 | |
| 526 | fn ryy(&mut self, theta: f64, q0: usize, q1: usize) { |
| 527 | self.chained.ryy(theta, q0, q1); |
| 528 | self.main.ryy(theta, q0, q1); |
| 529 | } |
| 530 | |
| 531 | fn rz(&mut self, theta: f64, q: usize) { |
| 532 | self.chained.rz(theta, q); |
| 533 | self.main.rz(theta, q); |
| 534 | } |
| 535 | |
| 536 | fn rzz(&mut self, theta: f64, q0: usize, q1: usize) { |
| 537 | self.chained.rzz(theta, q0, q1); |
| 538 | self.main.rzz(theta, q0, q1); |
| 539 | } |
| 540 | |
| 541 | fn sadj(&mut self, q: usize) { |
| 542 | self.chained.sadj(q); |
| 543 | self.main.sadj(q); |
| 544 | } |
| 545 | |
| 546 | fn s(&mut self, q: usize) { |
| 547 | self.chained.s(q); |
| 548 | self.main.s(q); |
| 549 | } |
| 550 | |
| 551 | fn swap(&mut self, q0: usize, q1: usize) { |
| 552 | self.chained.swap(q0, q1); |
| 553 | self.main.swap(q0, q1); |
| 554 | } |
| 555 | |
| 556 | fn tadj(&mut self, q: usize) { |
| 557 | self.chained.tadj(q); |
| 558 | self.main.tadj(q); |
| 559 | } |
| 560 | |
| 561 | fn t(&mut self, q: usize) { |
| 562 | self.chained.t(q); |
| 563 | self.main.t(q); |
| 564 | } |
| 565 | |
| 566 | fn x(&mut self, q: usize) { |
| 567 | self.chained.x(q); |
| 568 | self.main.x(q); |
| 569 | } |
| 570 | |
| 571 | fn y(&mut self, q: usize) { |
| 572 | self.chained.y(q); |
| 573 | self.main.y(q); |
| 574 | } |
| 575 | |
| 576 | fn z(&mut self, q: usize) { |
| 577 | self.chained.z(q); |
| 578 | self.main.z(q); |
| 579 | } |
| 580 | |
| 581 | fn qubit_allocate(&mut self) -> usize { |
| 582 | // Warning: we use the qubit id allocated by the |
| 583 | // main backend, even for later calls into the chained |
| 584 | // backend. This is not an issue today, but could |
| 585 | // become an issue if the qubit ids differ between |
| 586 | // the two backends. |
| 587 | let _ = self.chained.qubit_allocate(); |
| 588 | self.main.qubit_allocate() |
| 589 | } |
| 590 | |
| 591 | fn qubit_release(&mut self, q: usize) -> bool { |
| 592 | let _ = self.chained.qubit_release(q); |
| 593 | self.main.qubit_release(q) |
| 594 | } |
| 595 | |
| 596 | fn qubit_swap_id(&mut self, q0: usize, q1: usize) { |
| 597 | self.chained.qubit_swap_id(q0, q1); |
| 598 | self.main.qubit_swap_id(q0, q1); |
| 599 | } |
| 600 | |
| 601 | fn capture_quantum_state( |
| 602 | &mut self, |
| 603 | ) -> (Vec<(num_bigint::BigUint, num_complex::Complex<f64>)>, usize) { |
| 604 | let _ = self.chained.capture_quantum_state(); |
| 605 | self.main.capture_quantum_state() |
| 606 | } |
| 607 | |
| 608 | fn qubit_is_zero(&mut self, q: usize) -> bool { |
| 609 | let _ = self.chained.qubit_is_zero(q); |
| 610 | self.main.qubit_is_zero(q) |
| 611 | } |
| 612 | |
| 613 | fn custom_intrinsic(&mut self, name: &str, arg: Value) -> Option<Result<Value, String>> { |
| 614 | let _ = self.chained.custom_intrinsic(name, arg.clone()); |
| 615 | self.main.custom_intrinsic(name, arg) |
| 616 | } |
| 617 | |
| 618 | fn set_seed(&mut self, seed: Option<u64>) { |
| 619 | self.chained.set_seed(seed); |
| 620 | self.main.set_seed(seed); |
| 621 | } |
| 622 | } |
| 623 | |