improved HTML reporting when n_leak=1

pygsti/report/reportables.py

@@ -1167,6 +1167,14 @@ def frobenius_diff(a, b, mx_basis):  # assume vary model1, model2 fixed
 # init args == (model1, model2, op_label)
 
 
+def leaky_gate_frob_dist(a, b, mx_basis):
+    n_leak = 1
+    return _tools.subspace_restricted_fro_dist(a, b, mx_basis, n_leak)
+
+
+Leaky_gate_frob_dist = _modf.opsfn_factory(leaky_gate_frob_dist)
+
+
 def jtrace_diff(a, b, mx_basis):  # assume vary model1, model2 fixed
     """
     Jamiolkowski trace distance between a and b
@@ -2455,6 +2463,8 @@ def info_of_opfn_by_name(name):
                         "where (a_i,b_i) are corresponding eigenvalues of A and B."),
         "frob": ("Frobenius|Distance",
                  "sqrt( sum( (A_ij - B_ij)^2 ) )"),
+        "la-frob": ("Frobenius|Distance (subspace)",
+                    "TO WRITE"),
         "unmodeled": ("Un-modeled|Error",
                       "The per-operation budget used to account for un-modeled errors (model violation)")
     }
@@ -2539,6 +2549,9 @@ def evaluate_opfn_by_name(name, model, target_model, op_label_or_string,
     elif name == "evnudiamond":
         fn = Eigenvalue_nonunitary_diamondnorm if b else \
             Circuit_eigenvalue_nonunitary_diamondnorm
+    elif name == "la-frob":
+        assert b
+        fn = Leaky_gate_frob_dist
     elif name == "frob":
         fn = Fro_diff if b else \
             Circuit_fro_diff

pygsti/report/section/gauge.py

@@ -171,7 +171,7 @@ def final_gates_vs_target_table_gauge_var(workspace, switchboard=None, confidenc
         if kwargs.get('n_leak', 0) == 0:
             display = ('inf', 'agi', 'trace', 'diamond', 'nuinf', 'nuagi')
         else:
-            display = ('inf', 'la-inf', 'agi', 'trace', 'la-trace', 'diamond', 'nuinf', 'nuagi')
+            display = ('la-frob', 'la-inf', 'la-trace', 'frob', 'inf', 'trace', 'agi', 'diamond', 'nuinf', 'nuagi')
         return workspace.GatesVsTargetTable(
             switchboard.mdl_final, switchboard.mdl_target, _cri(1, switchboard, confidence_level, ci_brevity),
             display=display

pygsti/tools/optools.py

@@ -619,6 +619,19 @@ def leading_dxd_submatrix_basis_vectors(d: int, n: int, current_basis, return_la
         return submatrix_basis_vectors
 
 
+def subspace_restricted_fro_dist(a, b, mx_basis, n_leak=0):
+    diff = a -  b
+    if n_leak == 0:
+        return _np.linalg.norm(diff, 'fro')
+    if n_leak == 1:
+        d = int(_np.sqrt(a.shape[0]))
+        assert a.shape == b.shape == (d**2, d**2)
+        B = leading_dxd_submatrix_basis_vectors(d-n_leak, d, mx_basis)
+        P = B @ B.T.conj()
+        return _np.linalg.norm(diff @ P)
+    raise ValueError()
+
+
 def average_gate_fidelity(a, b, mx_basis='pp', is_tp=None, is_unitary=None):
     """
     Computes the average gate fidelity (AGF) between two gates.