Added get_qpu to templates

tnbs/templates/get_qpu.py

@@ -0,0 +1,58 @@
+"""
+Selector for QPU.
+"""
+
+def get_qpu(qpu=None):
+    """
+    Function for selecting solver.
+
+    Parameters
+    ----------
+
+    qpu : str
+        * qlmass: for trying to use QLM as a Service connection
+            to CESGA QLM
+        * python: for using PyLinalg simulator.
+        * c: for using CLinalg simulator
+        * mps: for using mps
+
+    Returns
+    ----------
+
+    linal_qpu : solver for quantum jobs
+    """
+
+    if qpu is None:
+        raise ValueError(
+            "qpu CAN NOT BE NONE. Please select one of the three" +
+            " following options: qlmass, python, c")
+    if qpu == "qlmass_linalg":
+        try:
+            from qlmaas.qpus import LinAlg
+            linalg_qpu = LinAlg()
+        except (ImportError, OSError) as exception:
+            raise ImportError(
+                "Problem Using QLMaaS. Please create config file" +
+                "or use mylm solver") from exception
+    elif qpu == "qlmass_mps":
+        try:
+            from qlmaas.qpus import MPS
+            #linalg_qpu = MPS(lnnize=True)
+            linalg_qpu = MPS()
+        except (ImportError, OSError) as exception:
+            raise ImportError(
+                "Problem Using QLMaaS. Please create config file" +
+                "or use mylm solver") from exception
+    elif qpu == "python":
+        from qat.qpus import PyLinalg
+        linalg_qpu = PyLinalg()
+    elif qpu == "c":
+        from qat.qpus import CLinalg
+        linalg_qpu = CLinalg()
+    elif qpu == "linalg":
+        from qat.qpus import LinAlg
+        linalg_qpu = LinAlg()
+    elif qpu == "mps":
+        from qat.qpus import MPS
+        linalg_qpu = MPS()
+    return linalg_qpu