Fix Photonics get_state
#2243
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| // Compile and run with: | ||
| // ``` | ||
| // nvq++ noise_callback.cpp --target density-matrix-cpu -o dyn.x | ||
| // && ./dyn.x | ||
| // ``` | ||
| // | ||
| // Note: You must set the target to a density matrix backend for the noise | ||
| // to successfully impact the system. | ||
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| #include <cudaq.h> | ||
| #include <iostream> | ||
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| // CUDA-Q supports several different models of noise. In this | ||
| // case, we will examine the dynamic noise channel specified as a callback | ||
| // function. | ||
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| int main() { | ||
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| // We will begin by defining an empty noise model that we will add | ||
| // our channel to. | ||
| cudaq::noise_model noise; | ||
| // Noise model callback function | ||
| const auto rx_noise = [](const auto &qubits, | ||
| const auto ¶ms) -> cudaq::kraus_channel { | ||
| // Model a pulse-length based rotation gate: | ||
| // the bigger the angle, the longer the pulse, i.e., more amplitude damping. | ||
| auto angle = params[0]; | ||
| // Normalize the angle into the [0, 2*pi] range | ||
| while (angle > 2. * M_PI) | ||
| angle -= 2. * M_PI; | ||
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| while (angle < 0) | ||
| angle += 2. * M_PI; | ||
| // Damping rate is linearly proportional to the angle | ||
| const auto damping_rate = angle / (2. * M_PI); | ||
| std::cout << "Angle = " << params[0] | ||
| << ", amplitude damping rate = " << damping_rate << "\n"; | ||
| return cudaq::amplitude_damping_channel(damping_rate); | ||
| }; | ||
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| // Bind the noise model callback function to the `rx` gate | ||
| noise.add_channel<cudaq::types::rx>(rx_noise); | ||
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| auto kernel = [](double angle) __qpu__ { | ||
| cudaq::qubit q; | ||
| rx(angle, q); | ||
| mz(q); | ||
| }; | ||
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| // Now let's set the noise and we're ready to run the simulation! | ||
| cudaq::set_noise(noise); | ||
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| // Our results should show measurements in both the |0> and |1> states, | ||
| // indicating that the noise has successfully impacted the system. Note: a | ||
| // `rx(pi)` is equivalent to a Pauli X gate, and thus, it should be in the |1> | ||
| // state if no noise is present. | ||
| auto noisy_counts = cudaq::sample(kernel, M_PI); | ||
| std::cout << "Noisy result:\n"; | ||
| noisy_counts.dump(); | ||
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| // To confirm this, we can run the simulation again without noise. | ||
| cudaq::unset_noise(); | ||
| auto noiseless_counts = cudaq::sample(kernel, M_PI); | ||
| std::cout << "Noiseless result:\n"; | ||
| noiseless_counts.dump(); | ||
| return 0; | ||
| } |
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Q: Is this a new gate? or an alias for 'plus'? Doesn't match the examples and API spec...
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This is a new gate replacing the
plusthat can be deprecated, the behaviour of theplusgate is not very intuitive (cycling through the number of photons).