diff --git a/gwinc/ifo/noises.py b/gwinc/ifo/noises.py
index caf200a9cd0593a8b5fef1d8ec9b98fdfaf2068e..344969e78cb0acf5012b751e6fcf7402f9c31694 100644
--- a/gwinc/ifo/noises.py
+++ b/gwinc/ifo/noises.py
@@ -184,6 +184,20 @@ class QuantumVacuum(nb.Noise):
         return noise.quantum.shotrad(self.freq, self.ifo)
 
 
+class StandardQuantumLimit(nb.Noise):
+    """Standard Quantum Limit
+
+    """
+    style = dict(
+        label="Standard Quantum Limit",
+        color="#000000",
+        linestyle=":", # Dotted.
+    )
+
+    def calc(self):
+        return 8 * const.hbar / (self.ifo.Materials.MirrorMass * (2 * np.pi * self.freq) ** 2)
+
+
 class Seismic(nb.Noise):
     """Seismic