diff --git a/src/qibolab/qubits.py b/src/qibolab/qubits.py
index dd2392414..4f328d4a2 100644
--- a/src/qibolab/qubits.py
+++ b/src/qibolab/qubits.py
@@ -38,14 +38,25 @@ class Qubit:
     name: QubitId
 
     bare_resonator_frequency: int = 0
-    readout_frequency: int = 0  # this is the dressed frequency
+    readout_frequency: int = 0
+    """ Readout dressed frequency"""
     drive_frequency: int = 0
     anharmonicity: int = 0
-    Ec: int = 0
-    Ej: int = 0
-    g: int = 0
+    sweetspot: float = 0.0
+    flux_to_bias: float = 0.0
+    asymmetry: float = 0.0
+    bare_resonator_frequency_sweetspot: float = 0.0
+    """Bare resonator frequency at sweetspot"""
+    ssf_brf: float = 0.0
+    """Estimated sweetspot qubit frequency divided by the bare_resonator_frequency"""
+    Ec: float = 0.0
+    """Readout Charge Energy"""
+    Ej: float = 0.0
+    """Readout Josephson Energy"""
+    g: float = 0.0
+    """Readout coupling"""
+
     assigment_fidelity: float = 0.0
-    sweetspot: float = 0
     peak_voltage: float = 0
     pi_pulse_amplitude: float = 0
     T1: int = 0
@@ -55,7 +66,6 @@ class Qubit:
     state1_voltage: int = 0
     mean_gnd_states: List[float] = field(default_factory=lambda: [0, 0])
     mean_exc_states: List[float] = field(default_factory=lambda: [0, 0])
-    resonator_polycoef_flux: List[float] = field(default_factory=list)
 
     # parameters for single shot classification
     threshold: Optional[float] = None
diff --git a/tests/dummy_qrc/zurich.yml b/tests/dummy_qrc/zurich.yml
index baa85f595..e6d6b3b18 100644
--- a/tests/dummy_qrc/zurich.yml
+++ b/tests/dummy_qrc/zurich.yml
@@ -163,7 +163,6 @@ characterization:
     single_qubit:
         0:
             readout_frequency: 5_229_200_000 #5_233_200_000
-            resonator_polycoef_flux: []
             drive_frequency: 4_095_830_788 #4_093_830_788
             T1: 0.0
             T2: 0.0
@@ -182,7 +181,6 @@ characterization:
 
         1:
             readout_frequency: 4_931_000_000
-            resonator_polycoef_flux: []
             drive_frequency: 4_170_000_000
             T1: 0.
             T2: 0.
@@ -191,7 +189,6 @@ characterization:
             mean_exc_states: [0, 0]
         2:
             readout_frequency: 6.109e+9  #6_112_000_000
-            resonator_polycoef_flux: []
             drive_frequency: 4_300_587_281 # 4_401_600_000 #4_541_100_000
             T1: 0.
             T2: 0.
@@ -204,7 +201,6 @@ characterization:
             # alpha: 208 MHz
         3:
             readout_frequency: 5_783_000_000
-            resonator_polycoef_flux: []
             drive_frequency: 4_100_000_000
             T1: 0.
             T2: 0.
@@ -213,7 +209,6 @@ characterization:
             mean_exc_states: [0, 0]
         4:
             readout_frequency: 5_515_000_000
-            resonator_polycoef_flux: []
             drive_frequency: 4_196_800_000
             T1: 0.
             T2: 0.