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#pragma once
#include <stdbool.h>
#include <stddef.h>
#include "maths/complex.h"
#include "maths/matrix.h"
struct PsiKrausOperator
{
struct PsiMatrix matrix;
const char *name;
};
struct PsiKrausOperator psi_new_kraus_operator(const char *name, struct PsiMatrix matrix);
void psi_free_kraus_operator(struct PsiKrausOperator *op);
struct PsiNoiseChannel
{
const char *name;
struct PsiKrausOperator *operators;
size_t operator_count;
size_t num_qubits;
};
struct PsiNoiseChannel psi_new_noise_channel(const char *name, const struct PsiKrausOperator *operators, size_t count, size_t num_qubits);
void psi_free_noise_channel(struct PsiNoiseChannel *channel);
struct PsiNoiseChannel psi_depolarising_channel(double p);
struct PsiNoiseChannel psi_amplitude_damping_channel(double gamma);
struct PsiNoiseChannel psi_phase_damping_channel(double gamma);
struct PsiNoiseChannel psi_bit_flip_channel(double p);
struct PsiNoiseChannel psi_phase_flip_channel(double p);
struct PsiNoiseChannel psi_bit_phase_flip_channel(double p);
struct PsiNoiseChannel psi_generalised_amplitude_damping_channel(double p, double gamma);
struct PsiDensityMatrix
{
struct PsiComplex *data;
size_t dim;
size_t num_qubits;
};
struct PsiDensityMatrix psi_new_density_matrix(size_t num_qubits);
struct PsiDensityMatrix psi_new_density_matrix_from_state(const struct PsiComplex *state, size_t len);
void psi_free_density_matrix(struct PsiDensityMatrix *dm);
struct PsiComplex psi_get_density_matrix(struct PsiDensityMatrix dm, size_t row, size_t col);
void psi_set_density_matrix(struct PsiDensityMatrix *dm, size_t row, size_t col, struct PsiComplex value);
struct PsiComplex psi_trace_density_matrix(struct PsiDensityMatrix dm);
double psi_purity_density_matrix(struct PsiDensityMatrix dm);
bool psi_is_pure_density_matrix(struct PsiDensityMatrix dm, double tolerance);
void psi_density_matrix_probabilities(struct PsiDensityMatrix dm, double *out);
void psi_apply_unitary_density_matrix(struct PsiDensityMatrix *dm, struct PsiMatrix gate, const size_t *targets, size_t target_count);
void psi_apply_noise_channel(struct PsiDensityMatrix *dm, struct PsiNoiseChannel channel, size_t target);
double psi_measure_probability_density_matrix(struct PsiDensityMatrix dm, size_t qubit, size_t outcome);
double psi_fidelity_density_matrix(struct PsiDensityMatrix dm, const struct PsiComplex *state);
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