Bug: Max Qubit number limit Deutsch-Josza

[PetarJurcevic]

Running the current version Deutsch-Josza algorithm with >21Q gives an error

----> 1 cir = dj_benchmark.DeutschJozsa(22, 'constant_circuit')
      2 transpile(cir, basis_gates=['x', 'sx', 'rz', 'cx'], optimization_level=3).draw()

File c:\Users\2J7579897\Notebooks_general\QEDC-benchmark\QC-App-Oriented-Benchmarks\deutsch-jozsa/qiskit\dj_benchmark.py:93, in DeutschJozsa(num_qubits, type)
     91 # Add a constant or balanced oracle function
     92 if type == 0: Uf = constant_oracle(input_size, num_qubits)
---> 93 else: Uf = balanced_oracle(input_size, num_qubits)
     94 qc.append(Uf, qr)
     96 qc.barrier()

File c:\Users\2J7579897\Notebooks_general\QEDC-benchmark\QC-App-Oriented-Benchmarks\deutsch-jozsa/qiskit\dj_benchmark.py:54, in balanced_oracle(input_size, num_qubits)
     52 b_str = "10101010101010101010"              # permit input_string up to 20 chars
     53 for qubit in range(input_size):
---> 54     if b_str[qubit] == '1':
     55         qc.x(qubit)
     57 qc.barrier()

IndexError: string index out of range

Possible Fixes:

• Expand bit string b_str in dj_benchmark.py by a few more characters
• create a dynamic bit string b_str depending on qubit number/ max qubit number

[rtvuser1]

This issue has been fixed.
We now create a dynamic bit string b_str depending on num_qubits

[rtvuser1]

Closed.
This issue has been fixed.
We now create a dynamic bit string b_str depending on num_qubits.