Merge pull request #25 from yangguohao/task77

[PaddlePaddle Hackathon]77 为哈密顿量矩阵实现指定量子比特数

paddle_quantum/utils.py

@@ -914,17 +914,21 @@ class Hamiltonian:
             pass
         return self.coefficients, self.__pauli_words
 
-    def construct_h_matrix(self):
+    def construct_h_matrix(self, n_qubit=None):
         r"""构建 Hamiltonian 在 Z 基底下的矩阵。
 
         Returns:
             np.ndarray: Z 基底下的哈密顿量矩阵形式
         """
         coefs, pauli_words, sites = self.decompose_with_sites()
+        if n_qubit is None:
             n_qubit = 1
             for site in sites:
                 if type(site[0]) is int:
+                    print(n_qubit,(site))
                     n_qubit = max(n_qubit, max(site) + 1)
+        else:
+            assert n_qubit>=self.n_qubits,"输入的量子数不小于哈密顿量表达式中所对应的量子比特数"
         h_matrix = np.zeros([2 ** n_qubit, 2 ** n_qubit], dtype='complex64')
         spin_ops = SpinOps(n_qubit, use_sparse=True)
         for idx in range(len(coefs)):

test_documents/test_construct_h_matrix.py

+from paddle_quantum.utils import Hamiltonian
+
+h = Hamiltonian([(1, 'Z0, Z1')])
+
+print(h.construct_h_matrix())
+print(h.construct_h_matrix(4))