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check for duplicate qubits #20

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ncrubin merged 1 commit into from
Aug 23, 2018
Merged

check for duplicate qubits #20

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5 changes: 5 additions & 0 deletions referenceqvm/unitary_generator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -202,6 +202,11 @@ def permutation_arbitrary(args, num_qubits):
if not (0 <= ind < num_qubits):
raise ValueError("Permutation SWAP index not valid")

seen = set()
for x in inds:
if x in seen:
raise ValueError("Duplicate qubit %d found" % x)

# Begin construction of permutation
perm = sps.eye(2 ** num_qubits).astype(np.complex128)

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