Added ability to change length of pin/CPW leading out of transmon cross (#949)

* claw cpw fix

* claw cpw fix 2

* typo

* forgot pin mod

* forgot to account for 0 cpw length

* lint fix

* fixed unit test

* more linting

---------

Co-authored-by: LFL-Lab <109769051+LFL-Lab@users.noreply.github.com>
Co-authored-by: Zlatko Minev <zminev@gmail.com>

Author: 3 people

docs/installation.rst

@@ -73,7 +73,7 @@ To do so, first navigate to the folder created by the clone. For example:
 
     cd qiskit-metal
 
-Once you are in the folder that contains the `environemnt.yml` file, execute the following installation commands:
+Once you are in the folder that contains the `environment.yml` file, execute the following installation commands:
 
 ::
 

qiskit_metal/qlibrary/qubits/transmon_cross.py

@@ -79,6 +79,8 @@ class TransmonCross(BaseQubit):  # pylint: disable=invalid-name
             ground_spacing='5um',
             claw_width='10um',
             claw_gap='6um',
+            claw_cpw_length='40um',
+            claw_cpw_width='10um',
             connector_location=
             '0'  # 0 => 'west' arm, 90 => 'north' arm, 180 => 'east' arm
         ))
@@ -175,10 +177,12 @@ def make_connection_pad(self, name: str):
         c_g = pc.claw_gap
         c_l = pc.claw_length
         c_w = pc.claw_width
+        c_c_w = pc.claw_cpw_width
+        c_c_l = pc.claw_cpw_length
         g_s = pc.ground_spacing
         con_loc = pc.connector_location
 
-        claw_cpw = draw.box(0, -c_w / 2, -4 * c_w, c_w / 2)
+        claw_cpw = draw.box(-c_w, -c_c_w / 2, -c_c_l - c_w, c_c_w / 2)
 
         if pc.connector_type == 0:  # Claw connector
             t_claw_height = 2*c_g + 2 * c_w + 2*g_s + \
@@ -193,14 +197,15 @@ def make_connection_pad(self, name: str):
             connector_arm = draw.shapely.ops.unary_union([claw_base, claw_cpw])
             connector_etcher = draw.buffer(connector_arm, c_g)
         else:
-            connector_arm = claw_cpw
+            connector_arm = draw.box(0, -c_w / 2, -4 * c_w, c_w / 2)
             connector_etcher = draw.buffer(connector_arm, c_g)
 
         # Making the pin for  tracking (for easy connect functions).
         # Done here so as to have the same translations and rotations as the connector. Could
         # extract from the connector later, but since allowing different connector types,
         # this seems more straightforward.
-        port_line = draw.LineString([(-4 * c_w, -c_w / 2), (-4 * c_w, c_w / 2)])
+        port_line = draw.LineString([(-c_c_l - c_w, -c_c_w / 2),
+                                     (-c_c_l - c_w, c_w / 2)])
 
         claw_rotate = 0
         if con_loc > 135:
@@ -225,4 +230,4 @@ def make_connection_pad(self, name: str):
                            subtract=True,
                            chip=chip)
 
-        self.add_pin(name, port_line.coords, c_w)
+        self.add_pin(name, port_line.coords, c_c_w)

qiskit_metal/tests/test_qlibrary_2_options.py

@@ -487,7 +487,7 @@ def test_qlibrary_transmon_cross_options(self):
         self.assertEqual(_options['cross_length'], '200um')
         self.assertEqual(_options['cross_gap'], '20um')
 
-        self.assertEqual(len(_options['_default_connection_pads']), 6)
+        self.assertEqual(len(_options['_default_connection_pads']), 8)
         self.assertEqual(_options['_default_connection_pads']['connector_type'],
                          '0')
         self.assertEqual(_options['_default_connection_pads']['claw_length'],
@@ -498,6 +498,10 @@ def test_qlibrary_transmon_cross_options(self):
                          '10um')
         self.assertEqual(_options['_default_connection_pads']['claw_gap'],
                          '6um')
+        self.assertEqual(
+            _options['_default_connection_pads']['claw_cpw_length'], '40um')
+        self.assertEqual(_options['_default_connection_pads']['claw_cpw_width'],
+                         '10um')
         self.assertEqual(
             _options['_default_connection_pads']['connector_location'], '0')