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| // Compile and run with: | ||
| // ``` | ||
| // nvq++ --target nvqc nvqc_qml.cpp -o out.x | ||
| // ./out.x | ||
| // ``` | ||
| // Assumes a valid NVQC API key has been set in the `NVQC_API_KEY` environment | ||
| // variable. Please refer to the documentations for information about how to | ||
| // attain NVQC API key. | ||
| #include <ctime> | ||
| #include <cudaq.h> | ||
| #include <cudaq/algorithm.h> | ||
| #include <cudaq/optimizers.h> | ||
| #include <random> | ||
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| struct kernel { | ||
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| auto operator()(const int n_qubits, | ||
| const std::vector<double> parameters) __qpu__ { | ||
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| cudaq::qvector qubits(n_qubits); | ||
| h(qubits); | ||
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| for (size_t i = 0; i < n_qubits; i++) { | ||
| rx(parameters[i], qubits[i]); | ||
| } | ||
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| for (size_t i = 0; i < n_qubits; i++) { | ||
| ry(parameters[i + n_qubits], qubits[i]); | ||
| } | ||
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| h(qubits); | ||
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| for (size_t i = 0; i < n_qubits; i++) { | ||
| rz(parameters[i + n_qubits * 2], qubits[i]); | ||
| } | ||
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| for (size_t i = 0; i < n_qubits; i += 2) { | ||
| cx(qubits[i], qubits[i + 1]); | ||
| } | ||
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| for (size_t i = 0; i < n_qubits; i++) { | ||
| rz(parameters[i + n_qubits * 2], qubits[i]); | ||
| } | ||
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| for (size_t i = 0; i < n_qubits; i += 2) { | ||
| cy(qubits[i], qubits[i + 1]); | ||
| } | ||
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| for (size_t i = 0; i < n_qubits; i++) { | ||
| ry(parameters[i + n_qubits], qubits[i]); | ||
| } | ||
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| for (size_t i = 0; i < n_qubits; i += 2) { | ||
| cz(qubits[i], qubits[i + 1]); | ||
| } | ||
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| x(qubits); | ||
| y(qubits); | ||
| h(qubits); | ||
| } | ||
| }; | ||
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| std::vector<double> initial_parameters(int n_parameters, int seed) { | ||
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| std::default_random_engine generator(seed); | ||
| std::uniform_real_distribution<float> distribution(0.0, 1.0); | ||
| std::vector<double> parameters(n_parameters); | ||
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| for (size_t i = 0; i < n_parameters; i++) { | ||
| parameters[i] = distribution(generator); | ||
| } | ||
| return parameters; | ||
| } | ||
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| int main() { | ||
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| const int n_qubits = 26; | ||
| const int n_parameters = 3 * n_qubits; | ||
| std::vector<double> parameters = initial_parameters(n_parameters, 13); | ||
| auto h = cudaq::spin::z(0); | ||
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| auto start = clock(); | ||
| auto exp_val = cudaq::observe(kernel{}, h, n_qubits, parameters); | ||
| auto end = clock(); | ||
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| printf("Expectation Value: %f \n", exp_val.expectation()); | ||
| printf("Runtime: %fs \n", float(end - start) / float(CLOCKS_PER_SEC)); | ||
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| return 0; | ||
| } |