fix: Accept sequence concatenation with more general iterables

src/qibolab/sequence.py

@@ -94,15 +94,15 @@ def pulse_channels(self, pulse_id: int) -> list[ChannelId]:
         """Find channels on which a pulse with a given id plays."""
         return [channel for channel, pulse in self if pulse.id == pulse_id]
 
-    def concatenate(self, other: "PulseSequence") -> None:
+    def concatenate(self, other: Iterable[_Element]) -> None:
         """Juxtapose two sequences.
 
         Appends ``other`` in-place such that the result is:
             - ``self``
             - necessary delays to synchronize channels
             - ``other``
         """
-        _synchronize(self, other.channels)
+        _synchronize(self, PulseSequence(other).channels)
         self.extend(other)
 
     def __ior__(self, other: "PulseSequence") -> "PulseSequence":

tests/integration/test_sequence.py

@@ -3,7 +3,7 @@
 from qibolab.pulses import Delay
 
 
-def test_dummy_execute_pulse_sequence_couplers():
+def test_sequence_creation():
     platform = create_platform("dummy")
 
     single = platform.natives.single_qubit
@@ -14,10 +14,19 @@ def test_dummy_execute_pulse_sequence_couplers():
 
     p02 = two[(0, 2)]
     p12 = two[(1, 2)]
+    q0 = single[0]
     q1 = single[1]
     q2 = single[2]
-
-    seq = q1.RX() | p12.CZ() | [("", Delay())] | q2.RX() | p02.CZ()
+    ch1 = platform.qubits[1]
+
+    seq = (
+        q1.RX()
+        | p12.CZ()
+        | [(ch1.drive, Delay(duration=6.5))]
+        | q2.RX()
+        | q0.RX12()
+        | p02.CZ()
+    )
     for q in range(3):
         seq |= single[q].MZ()