From 6a8abdff4b87bf2a72e9d46d85ed7bf025bf752b Mon Sep 17 00:00:00 2001
From: Stavros Efthymiou <35475381+stavros11@users.noreply.github.com>
Date: Tue, 25 Apr 2023 17:20:40 +0400
Subject: [PATCH] Copy Hamiltonian ground state before passing to adiabatic
 evolution

---
 src/qibo/models/evolution.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/qibo/models/evolution.py b/src/qibo/models/evolution.py
index 58e35322ff..42c43be240 100644
--- a/src/qibo/models/evolution.py
+++ b/src/qibo/models/evolution.py
@@ -236,7 +236,9 @@ def execute(self, final_time, start_time=0.0, initial_state=None):
             )
         self.hamiltonian.total_time = final_time - start_time
         if initial_state is None:
-            initial_state = self.hamiltonian.ground_state()
+            initial_state = self.backend.cast(
+                self.hamiltonian.ground_state(), copy=True
+            )
         return super().execute(final_time, start_time, initial_state)
 
     @staticmethod