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#include "core/custom_gate.h"
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include "core/gates.h"
struct PsiCustomGate psi_new_custom_gate_from_matrix(const char* name, struct PsiMatrix matrix)
{
assert(matrix.rows == matrix.cols);
size_t dim = matrix.rows;
assert(dim > 0 && (dim & (dim - 1)) == 0);
size_t num_qubits = 0;
while (((size_t)1 << num_qubits) < dim)
num_qubits++;
struct PsiCustomGate gate;
gate.name = name;
gate.num_qubits = num_qubits;
gate.kind = PSI_CUSTOM_GATE_MATRIX;
gate.definition.matrix = matrix;
return gate;
}
struct PsiCustomGate psi_new_custom_gate_from_composite(const char* name, size_t num_qubits,
const struct PsiCompositeGateOp* ops,
size_t op_count)
{
struct PsiCompositeGateOp* owned = malloc(op_count * sizeof(struct PsiCompositeGateOp));
assert(owned != NULL || op_count == 0);
if (op_count > 0)
memcpy(owned, ops, op_count * sizeof(struct PsiCompositeGateOp));
struct PsiCustomGate gate;
gate.name = name;
gate.num_qubits = num_qubits;
gate.kind = PSI_CUSTOM_GATE_COMPOSITE;
gate.definition.composite.ops = owned;
gate.definition.composite.count = op_count;
return gate;
}
void psi_free_custom_gate(struct PsiCustomGate* gate)
{
if (gate->kind == PSI_CUSTOM_GATE_MATRIX)
{
psi_free_matrix(&gate->definition.matrix);
return;
}
free(gate->definition.composite.ops);
gate->definition.composite.ops = NULL;
gate->definition.composite.count = 0;
}
static struct PsiQuantumGate op_gate(enum PsiCompositeOp op)
{
switch (op)
{
case PSI_OP_H: return psi_hadamard_gate();
case PSI_OP_X: return psi_pauli_x_gate();
case PSI_OP_Y: return psi_pauli_y_gate();
case PSI_OP_Z: return psi_pauli_z_gate();
case PSI_OP_S: return psi_s_gate();
case PSI_OP_T: return psi_t_gate();
case PSI_OP_CNOT: return psi_cnot_gate();
case PSI_OP_CZ: return psi_cz_gate();
case PSI_OP_SWAP: return psi_swap_gate();
case PSI_OP_CCNOT: return psi_toffoli_gate();
case PSI_OP_CSWAP: return psi_fredkin_gate();
}
return psi_identity_gate();
}
static bool find_target(const size_t* targets, size_t count, size_t q, size_t* pos)
{
for (size_t i = 0; i < count; i++)
if (targets[i] == q)
{
*pos = i;
return true;
}
return false;
}
static struct PsiMatrix build_full_operator(struct PsiMatrix gate_matrix, const size_t* targets,
size_t num_gate_qubits, size_t total_qubits)
{
size_t dim = (size_t)1 << total_qubits;
size_t gate_dim = gate_matrix.rows;
struct PsiMatrix result = psi_new_matrix(dim, dim);
for (size_t i = 0; i < dim; i++)
for (size_t j = 0; j < dim; j++)
{
size_t gate_i = 0;
size_t gate_j = 0;
bool match_non_targets = true;
for (size_t q = 0; q < total_qubits; q++)
{
size_t bit_i = (i >> (total_qubits - 1 - q)) & 1;
size_t bit_j = (j >> (total_qubits - 1 - q)) & 1;
size_t pos;
if (find_target(targets, num_gate_qubits, q, &pos))
{
gate_i |= bit_i << (num_gate_qubits - 1 - pos);
gate_j |= bit_j << (num_gate_qubits - 1 - pos);
}
else if (bit_i != bit_j)
{
match_non_targets = false;
break;
}
}
if (match_non_targets)
result.data[i * dim + j] = gate_matrix.data[gate_i * gate_dim + gate_j];
}
return result;
}
static struct PsiMatrix compute_composite_matrix(struct PsiCustomGate gate)
{
size_t dim = (size_t)1 << gate.num_qubits;
struct PsiMatrix result = psi_identity_matrix(dim);
for (size_t i = 0; i < gate.definition.composite.count; i++)
{
struct PsiCompositeGateOp step = gate.definition.composite.ops[i];
struct PsiQuantumGate g = op_gate(step.op);
struct PsiMatrix full =
build_full_operator(g.matrix, step.targets, step.target_count, gate.num_qubits);
struct PsiMatrix next = psi_dot_matrix(full, result);
psi_free_matrix(&full);
psi_free_matrix(&result);
psi_free_quantum_gate(&g);
result = next;
}
return result;
}
struct PsiQuantumGate psi_to_quantum_gate(struct PsiCustomGate gate)
{
if (gate.kind == PSI_CUSTOM_GATE_MATRIX)
return psi_new_quantum_gate(gate.name, psi_clone_matrix(gate.definition.matrix),
gate.num_qubits);
return psi_new_quantum_gate(gate.name, compute_composite_matrix(gate), gate.num_qubits);
}
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