[WIRES] Make plugin compatible with wires refactor (#37)

* implemented new wire management

* fix device

* fix plugin

* Update .github/CHANGELOG.md

.github/CHANGELOG.md

@@ -6,6 +6,22 @@
 
 ### Improvements
 
+* Made plugin device compatible with new PennyLane wire management. 
+
+  One can now specify any string or number as a custom wire label, 
+  and use these labels to address subsystems on the device:
+
+  ``` python
+
+  dev = qml.device('cirq.simulator', wires=['q1', 'ancilla', 0, 1]
+
+  def circuit():
+    qml.Hadamard(wires='q1')
+    qml.CNOT(wires=[1, 'ancilla'])
+    ...
+  ```
+  [#37](https://github.com/PennyLaneAI/pennylane-cirq/pull/37)
+
 ### Documentation
 
 ### Bug fixes
@@ -14,6 +30,18 @@
 
 This release contains contributions from (in alphabetical order):
 
+Maria Schuld
+
+---
+
+# Release 0.9.1
+
+### Improvements
+
+### Contributors
+
+This release contains contributions from (in alphabetical order):
+
 ---
 
 # Release 0.9.0
@@ -39,7 +67,7 @@ This release contains contributions from (in alphabetical order):
 
 This release contains contributions from (in alphabetical order):
 
-Theodor Isacsson, Nathan Killoran, Maria Shuld, Antal Száva
+Theodor Isacsson, Nathan Killoran, Maria Schuld, Antal Száva
 
 ---
 

pennylane_cirq/cirq_device.py

@@ -71,6 +71,8 @@ def __init__(self, wires, shots, analytic, qubits=None):
 
         self.circuit = None
 
+        device_wires = self.map_wires(self.wires)
+
         if qubits:
             if wires != len(qubits):
                 raise qml.DeviceError(
@@ -81,7 +83,7 @@ def __init__(self, wires, shots, analytic, qubits=None):
 
             self.qubits = qubits
         else:
-            self.qubits = [cirq.LineQubit(wire) for wire in range(wires)]
+            self.qubits = [cirq.LineQubit(wire) for wire in device_wires.labels]
 
         # Add inverse operations
         self._inverse_operation_map = {}
@@ -193,8 +195,9 @@ def _apply_operation(self, operation):
         if cirq_operation:
             cirq_operation.parametrize(*operation.parameters)
 
+            device_wires = self.map_wires(operation.wires)
             self.circuit.append(
-                cirq_operation.apply(*[self.qubits[wire] for wire in operation.wires])
+                cirq_operation.apply(*[self.qubits[w] for w in device_wires.labels])
             )
 
     def apply(self, operations, **kwargs):