diff --git a/src/qibotn/quimb.py b/src/qibotn/quimb.py
index 93457f4..4f7244f 100644
--- a/src/qibotn/quimb.py
+++ b/src/qibotn/quimb.py
@@ -1,6 +1,6 @@
 import re
 
-import qibo
+from qibo.models import Circuit as QiboCircuit
 import quimb.tensor as qtn
 import numpy as np
 
@@ -22,7 +22,7 @@ def get_gate_functions(qasm_str, start_idx):
         idx_inc += 1
 
 
-def convert(nqubits: int, qasm_str: str, with_swaps: bool = True, psi0=None):
+def from_qibo(circuit: QiboCircuit, with_swaps: bool = True, psi0=None):
     circ = qtn.Circuit(nqubits, psi0=psi0)
 
     qasm_str = qasm_str.split("\n")
@@ -65,9 +65,9 @@ def eval(qasm: str, init_state, backend="numpy", swaps=True):
     backend (quimb): numpy, cupy, jax. Passed to ``opt_einsum``.
 
     """
-    circuit = qibo.models.Circuit.from_qasm(qasm)
+    circuit = QiboCircuit.from_qasm(qasm)
     init_state_mps = init_state_tn(circuit.nqubits, init_state)
-    circ_quimb = convert(circuit, swaps=swaps, psi0=init_state_mps)
+    circ_quimb = from_qibo(circuit, swaps=swaps, psi0=init_state_mps)
     interim = circ_quimb.psi.full_simplify(seq="DRC")
     amplitudes = interim.to_dense(backend=backend).flatten()
 
diff --git a/tests/config.py b/tests/config.py
index 96621a2..7570e30 100644
--- a/tests/config.py
+++ b/tests/config.py
@@ -1,10 +1,13 @@
-qibo = dict(
-    backend = 'qibojit',
-    platform = 'numpy',
-    swaps = True
-)
+from dataclasses import dataclass
+from typing import Optional
 
-quimb = dict(
-    backend = 'numpy',
-    swaps = True
-)
+
+@dataclass
+class Executor:
+    backend: str
+    platform: Optional[str] = None
+    swaps: bool = True
+
+
+qibo = Executor(backend="qibojit", platform="numpy")
+quimb = Executor(backend="numpy")
diff --git a/tests/test_qasm_quimb_backend.py b/tests/test_qasm_quimb_backend.py
index 9f4c854..db1ad27 100644
--- a/tests/test_qasm_quimb_backend.py
+++ b/tests/test_qasm_quimb_backend.py
@@ -10,10 +10,9 @@ from timeit import default_timer as timer
 import config
 
 
-def init_state_sv(nqubits):
+def create_init_state(nqubits):
     init_state = np.random.random(2**nqubits) + 1j * np.random.random(2**nqubits)
     init_state = init_state / np.sqrt((np.abs(init_state) ** 2).sum())
-    # An unmodified init_state has to be converted to tn format
     return init_state
 
 
@@ -23,34 +22,43 @@ def qibo_qft(nqubits, init_state, swaps):
     return circ_qibo, state_vec
 
 
+def time(func):
+    start = timer()
+    res = func()
+    end = timer()
+    time = end - start
+    return time, res
+
+
 @pytest.mark.parametrize("nqubits", [1, 2, 5, 10])
 def test_eval(nqubits: int):
+    # hack quimb to use the correct number of processes
+    # TODO: remove completely, or at least delegate to the backend
+    # implementation
     os.environ["QUIMB_NUM_PROCS"] = str(os.cpu_count())
-    from qibotn import qasm_quimb
+    import qibotn.quimb
 
-    init_state = init_state_sv(nqubits=nqubits)
+    init_state = create_init_state(nqubits=nqubits)
+    init_state_tn = copy.deepcopy(init_state)
 
     # Test qibo
-    qibo.set_backend(backend=config.qibo["backend"], platform=config.qibo["platform"])
-    start_time = timer()
-    qibo_circ, result_sv = qibo_qft(nqubits, init_state, swaps=config.qibo["swaps"])
-    end_time = timer()
-    qibo_time = end_time - start_time
+    qibo.set_backend(backend=config.qibo.backend, platform=config.qibo.platform)
+    qibo_time, (qibo_circ, result_sv) = time(
+        lambda: qibo_qft(nqubits, init_state, swaps=config.qibo.swaps)
+    )
 
     # Convert to qasm for other backends
     qasm_circ = qibo_circ.to_qasm()
-    __import__("pdb").set_trace()
 
     # Test quimb
-    start_time = timer()
-    result_tn = qasm_quimb.eval_QI_qft(
-        nqubits=nqubits,
-        qasm_circ=qasm_circ,
-        init_state=copy.deepcopy(init_state),
-        backend=config.quimb["backend"],
-        swaps=config.quimb["swaps"],
+    quimb_time, result_tn = time(
+        lambda: qibotn.quimb.eval(
+            qasm_circ,
+            init_state_tn,
+            backend=config.quimb.backend,
+            swaps=config.quimb.swaps,
+        )
     )
-    end_time = timer()
-    quimb_time = end_time - start_time
 
+    assert 1e-2 * qibo_time < quimb_time < 1e2 * qibo_time
     assert np.allclose(result_sv, result_tn), "Resulting dense vectors do not match"