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alessandro-santini · Jun 4, 2022 · 37441a6 · 37441a6
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Showing 4 changed files with 2 additions and 2 deletions.
diff --git a/spin_systems/__pycache__/iHamiltonians.cpython-38.pyc b/spin_systems/__pycache__/iHamiltonians.cpython-38.pyc
diff --git a/spin_systems/iHamiltonians.py b/spin_systems/iHamiltonians.py
@@ -13,6 +13,6 @@ def IsingChainWithAncilla(J=1., h_z=0.25, h_x=0.):
     sx_anc = np.kron(Id2,sx)
 
     H  = -J*(np.kron(sx_sys,sx_sys))-h_z*(np.kron(sz_sys,Id4)+np.kron(Id4,sz_sys))-h_x*(np.kron(sx_sys,Id4)+np.kron(Id4,sx_sys))
-    H  -= -J*(np.kron(sx_anc,sx_anc))-h_z*(np.kron(sz_anc,Id4)+np.kron(Id4,sz_anc))-h_x*(np.kron(sx_anc,Id4)+np.kron(Id4,sx_anc))
+    H  += -J*(np.kron(sx_anc,sx_anc))-h_z*(np.kron(sz_anc,Id4)+np.kron(Id4,sz_anc))-h_x*(np.kron(sx_anc,Id4)+np.kron(Id4,sx_anc))
 
     return H
diff --git a/tensors/__pycache__/iMatrixProductState.cpython-38.pyc b/tensors/__pycache__/iMatrixProductState.cpython-38.pyc
diff --git a/tensors/iMatrixProductState.py b/tensors/iMatrixProductState.py
@@ -55,7 +55,7 @@ def compute_corr_length(self):
         self.compute_transfer_matrix()
         eig =np.sort(  np.abs(eigs(self.T, k=6, ncv=300, which='LM',return_eigenvectors=False)) )[::-1]
         self.Teig = eig
-        return -2./np.log(eig[1])
+        return (-2./np.log(eig[1]),-2./np.log(eig[2]))
 
     def compute_long_distance_observable_degenerate(self,op):
         self.compute_transfer_matrix()