From 3fb69b3051f39602b1e4c3f0229a849a2ff6b8e4 Mon Sep 17 00:00:00 2001
From: Steve Wood <40241007+woodsp-ibm@users.noreply.github.com>
Date: Sat, 6 Jul 2024 08:49:39 -0400
Subject: [PATCH] Scipy 1.14 compatibility fix (#184)

---
 .pylintdict                                            | 1 +
 qiskit_algorithms/eigensolvers/numpy_eigensolver.py    | 4 ++--
 releasenotes/notes/numpy_2.0_fix-c29681db4874eee8.yaml | 6 ++++++
 3 files changed, 9 insertions(+), 2 deletions(-)
 create mode 100644 releasenotes/notes/numpy_2.0_fix-c29681db4874eee8.yaml

diff --git a/.pylintdict b/.pylintdict
index 257e3f66..f4d90d78 100644
--- a/.pylintdict
+++ b/.pylintdict
@@ -52,6 +52,7 @@ configs
 confint
 córcoles
 crs
+csr
 currentmodule
 customizable
 cvar
diff --git a/qiskit_algorithms/eigensolvers/numpy_eigensolver.py b/qiskit_algorithms/eigensolvers/numpy_eigensolver.py
index d1aef88c..b5deb93a 100644
--- a/qiskit_algorithms/eigensolvers/numpy_eigensolver.py
+++ b/qiskit_algorithms/eigensolvers/numpy_eigensolver.py
@@ -1,6 +1,6 @@
 # This code is part of a Qiskit project.
 #
-# (C) Copyright IBM 2022, 2023.
+# (C) Copyright IBM 2022, 2024.
 #
 # This code is licensed under the Apache License, Version 2.0. You may
 # obtain a copy of this license in the LICENSE.txt file in the root directory
@@ -152,7 +152,7 @@ def _solve(self, operator: BaseOperator) -> tuple[np.ndarray, np.ndarray]:
 
     @staticmethod
     def _solve_sparse(op_matrix: scisparse.csr_matrix, k: int) -> tuple[np.ndarray, np.ndarray]:
-        if (op_matrix != op_matrix.H).nnz == 0:
+        if (op_matrix != op_matrix.getH()).nnz == 0:
             # Operator is Hermitian
             return scisparse.linalg.eigsh(op_matrix, k=k, which="SA")
         else:
diff --git a/releasenotes/notes/numpy_2.0_fix-c29681db4874eee8.yaml b/releasenotes/notes/numpy_2.0_fix-c29681db4874eee8.yaml
new file mode 100644
index 00000000..cbeed03d
--- /dev/null
+++ b/releasenotes/notes/numpy_2.0_fix-c29681db4874eee8.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Compatibility fix for scipy 1.14 version. csr_matrix.H had been deprecated
+    and was removed. The :class:`.NumPyEigensolver` algorithm, which
+    had been using that, has been updated to use an alternative.