{"abstract":"A condition on register value 2 fires when clbit 0 is set instead of clbit 1.","category":"Quantum circuit simulation","checks":6,"contract":"Input [nq, nc, ops] on computational basis states only: [\"x\", q], [\"cx\", c, t], [\"ccx\", a, b, t], [\"swap\", a, b], [\"measure\", q, c], [\"reset\", q], [\"x_if\", q, value] (flip q when the classical register value, clbit 0 = LSB, equals value). Return {\"qubits\": bits with qubit nq-1 leftmost, \"clbits\": bits with clbit nc-1 leftmost}.","evaluation_group":"w2-quantum_circuit_simulation-dynamic-circuit-basis","failed_approach":"The attempted repair shifts each clbit by nc - i, which is off by one position and never matches small values.","family":"w2-quantum_circuit_simulation-dynamic-circuit-basis-register-value-bit-order","id":"FA-91166","implementations":{"attempt":{"sha256":"9e078f9135aa698878b9a23dcabdddb265dfd4aa3667ace6c6a8bda0e7c474f5","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    nq, nc, ops = x\n    q = [0] * nq\n    c = [0] * nc\n    for op in ops:\n        name = op[0]\n        if name == 'x':\n            q[op[1]] ^= 1\n        elif name == 'cx':\n            if q[op[1]]:\n                q[op[2]] ^= 1\n        elif name == 'ccx':\n            if q[op[1]] and q[op[2]]:\n                q[op[3]] ^= 1\n        elif name == 'swap':\n            a, b = op[1], op[2]\n            q[a], q[b] = q[b], q[a]\n        elif name == 'measure':\n            _, qb, cb = op\n            c[cb] = q[qb]\n        elif name == 'reset':\n            q[op[1]] = 0\n        elif name == 'x_if':\n            creg = sum(bit << (nc - i) for i, bit in enumerate(c))\n            if creg == op[2]:\n                q[op[1]] ^= 1\n    return {'qubits': ''.join(str(b) for b in reversed(q)), 'clbits': ''.join(str(b) for b in reversed(c))}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['control: reset excited qubit', [1, 1, [['x', 0], ['reset', 0], ['measure', 0, 0]]], {'qubits': '0', 'clbits': '0'}], ['control: toffoli one control', [3, 3, [['x', 0], ['ccx', 0, 1, 2]]], {'qubits': '001', 'clbits': '000'}], ['control: toffoli no controls', [3, 3, [['ccx', 0, 1, 2]]], {'qubits': '000', 'clbits': '000'}], ['control: measure into other clbit', [2, 2, [['x', 0], ['measure', 0, 1]]], {'qubits': '01', 'clbits': '10'}]], [['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['control: swap excitation', [2, 2, [['x', 0], ['swap', 0, 1]]], {'qubits': '10', 'clbits': '00'}], ['control: asymmetric output', [3, 3, [['x', 0], ['measure', 0, 0]]], {'qubits': '001', 'clbits': '001'}], ['control: random dynamic 0', [4, 4, [['cx', 2, 1], ['reset', 2], ['x_if', 1, 5], ['x_if', 3, 6], ['reset', 2], ['cx', 3, 1], ['swap', 1, 2], ['x', 0]]], {'qubits': '0001', 'clbits': '0000'}], ['control: random dynamic 1', [2, 2, [['cx', 1, 0], ['x_if', 0, 2], ['x', 1], ['swap', 0, 1], ['reset', 1], ['cx', 1, 0], ['x', 1]]], {'qubits': '11', 'clbits': '00'}]], [['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['control: random dynamic 2', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 1], ['x', 0], ['x_if', 2, 5], ['reset', 1], ['cx', 2, 0], ['swap', 1, 0], ['cx', 1, 0]]], {'qubits': '011', 'clbits': '010'}], ['control: random dynamic 3', [4, 4, [['ccx', 3, 0, 2], ['x_if', 1, 8], ['x_if', 1, 10], ['measure', 0, 3], ['reset', 0], ['measure', 0, 1]]], {'qubits': '0000', 'clbits': '0000'}], ['control: random dynamic 4', [2, 2, [['x', 0], ['measure', 1, 1]]], {'qubits': '01', 'clbits': '00'}], ['control: random dynamic 5', [4, 4, [['x_if', 1, 4], ['reset', 1], ['x_if', 1, 10], ['x', 0], ['measure', 2, 1], ['measure', 1, 0]]], {'qubits': '0001', 'clbits': '0000'}]], [['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['control: random dynamic 6', [2, 2, [['reset', 0], ['x', 1], ['swap', 1, 0], ['reset', 0], ['measure', 1, 0], ['x_if', 0, 1], ['cx', 0, 1], ['swap', 1, 0], ['cx', 1, 0]]], {'qubits': '00', 'clbits': '00'}], ['control: random dynamic 7', [4, 4, [['ccx', 1, 0, 2], ['x_if', 1, 6]]], {'qubits': '0000', 'clbits': '0000'}], ['control: random dynamic 8', [3, 3, [['reset', 2], ['x', 1], ['ccx', 0, 2, 1], ['measure', 1, 1], ['reset', 2]]], {'qubits': '010', 'clbits': '010'}], ['control: random dynamic 9', [2, 2, [['cx', 0, 1], ['cx', 0, 1], ['measure', 0, 0], ['swap', 0, 1], ['measure', 0, 1], ['swap', 0, 1], ['measure', 0, 1], ['measure', 0, 0], ['swap', 1, 0]]], {'qubits': '00', 'clbits': '00'}]], [['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['control: random dynamic 10', [3, 3, [['x', 2], ['measure', 2, 2], ['ccx', 2, 1, 0], ['swap', 0, 2], ['cx', 2, 0], ['x', 1], ['ccx', 2, 0, 1], ['cx', 2, 0], ['x', 1]]], {'qubits': '001', 'clbits': '100'}], ['control: random dynamic 11', [3, 3, [['reset', 2], ['x', 2]]], {'qubits': '100', 'clbits': '000'}], ['control: random dynamic 12', [3, 3, [['x', 1], ['x', 2]]], {'qubits': '110', 'clbits': '000'}], ['control: random dynamic 13', [2, 2, [['x_if', 1, 0], ['x', 0], ['swap', 1, 0], ['x', 1], ['cx', 1, 0], ['x_if', 1, 3], ['measure', 1, 1], ['swap', 1, 0], ['x', 1]]], {'qubits': '00', 'clbits': '00'}]]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"9eb04e4770efba5d8c3d9e7329819b733144d3439cae9302894850e16acd2aab","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    nq, nc, ops = x\n    q = [0] * nq\n    c = [0] * nc\n    for op in ops:\n        name = op[0]\n        if name == 'x':\n            q[op[1]] ^= 1\n        elif name == 'cx':\n            if q[op[1]]:\n                q[op[2]] ^= 1\n        elif name == 'ccx':\n            if q[op[1]] and q[op[2]]:\n                q[op[3]] ^= 1\n        elif name == 'swap':\n            a, b = op[1], op[2]\n            q[a], q[b] = q[b], q[a]\n        elif name == 'measure':\n            _, qb, cb = op\n            c[cb] = q[qb]\n        elif name == 'reset':\n            q[op[1]] = 0\n        elif name == 'x_if':\n            creg = int(''.join(str(bit) for bit in c), 2)\n            if creg == op[2]:\n                q[op[1]] ^= 1\n    return {'qubits': ''.join(str(b) for b in reversed(q)), 'clbits': ''.join(str(b) for b in reversed(c))}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['control: reset excited qubit', [1, 1, [['x', 0], ['reset', 0], ['measure', 0, 0]]], {'qubits': '0', 'clbits': '0'}], ['control: toffoli one control', [3, 3, [['x', 0], ['ccx', 0, 1, 2]]], {'qubits': '001', 'clbits': '000'}], ['control: toffoli no controls', [3, 3, [['ccx', 0, 1, 2]]], {'qubits': '000', 'clbits': '000'}], ['control: measure into other clbit', [2, 2, [['x', 0], ['measure', 0, 1]]], {'qubits': '01', 'clbits': '10'}]], [['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['control: swap excitation', [2, 2, [['x', 0], ['swap', 0, 1]]], {'qubits': '10', 'clbits': '00'}], ['control: asymmetric output', [3, 3, [['x', 0], ['measure', 0, 0]]], {'qubits': '001', 'clbits': '001'}], ['control: random dynamic 0', [4, 4, [['cx', 2, 1], ['reset', 2], ['x_if', 1, 5], ['x_if', 3, 6], ['reset', 2], ['cx', 3, 1], ['swap', 1, 2], ['x', 0]]], {'qubits': '0001', 'clbits': '0000'}], ['control: random dynamic 1', [2, 2, [['cx', 1, 0], ['x_if', 0, 2], ['x', 1], ['swap', 0, 1], ['reset', 1], ['cx', 1, 0], ['x', 1]]], {'qubits': '11', 'clbits': '00'}]], [['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['control: random dynamic 2', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 1], ['x', 0], ['x_if', 2, 5], ['reset', 1], ['cx', 2, 0], ['swap', 1, 0], ['cx', 1, 0]]], {'qubits': '011', 'clbits': '010'}], ['control: random dynamic 3', [4, 4, [['ccx', 3, 0, 2], ['x_if', 1, 8], ['x_if', 1, 10], ['measure', 0, 3], ['reset', 0], ['measure', 0, 1]]], {'qubits': '0000', 'clbits': '0000'}], ['control: random dynamic 4', [2, 2, [['x', 0], ['measure', 1, 1]]], {'qubits': '01', 'clbits': '00'}], ['control: random dynamic 5', [4, 4, [['x_if', 1, 4], ['reset', 1], ['x_if', 1, 10], ['x', 0], ['measure', 2, 1], ['measure', 1, 0]]], {'qubits': '0001', 'clbits': '0000'}]], [['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['control: random dynamic 6', [2, 2, [['reset', 0], ['x', 1], ['swap', 1, 0], ['reset', 0], ['measure', 1, 0], ['x_if', 0, 1], ['cx', 0, 1], ['swap', 1, 0], ['cx', 1, 0]]], {'qubits': '00', 'clbits': '00'}], ['control: random dynamic 7', [4, 4, [['ccx', 1, 0, 2], ['x_if', 1, 6]]], {'qubits': '0000', 'clbits': '0000'}], ['control: random dynamic 8', [3, 3, [['reset', 2], ['x', 1], ['ccx', 0, 2, 1], ['measure', 1, 1], ['reset', 2]]], {'qubits': '010', 'clbits': '010'}], ['control: random dynamic 9', [2, 2, [['cx', 0, 1], ['cx', 0, 1], ['measure', 0, 0], ['swap', 0, 1], ['measure', 0, 1], ['swap', 0, 1], ['measure', 0, 1], ['measure', 0, 0], ['swap', 1, 0]]], {'qubits': '00', 'clbits': '00'}]], [['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['control: random dynamic 10', [3, 3, [['x', 2], ['measure', 2, 2], ['ccx', 2, 1, 0], ['swap', 0, 2], ['cx', 2, 0], ['x', 1], ['ccx', 2, 0, 1], ['cx', 2, 0], ['x', 1]]], {'qubits': '001', 'clbits': '100'}], ['control: random dynamic 11', [3, 3, [['reset', 2], ['x', 2]]], {'qubits': '100', 'clbits': '000'}], ['control: random dynamic 12', [3, 3, [['x', 1], ['x', 2]]], {'qubits': '110', 'clbits': '000'}], ['control: random dynamic 13', [2, 2, [['x_if', 1, 0], ['x', 0], ['swap', 1, 0], ['x', 1], ['cx', 1, 0], ['x_if', 1, 3], ['measure', 1, 1], ['swap', 1, 0], ['x', 1]]], {'qubits': '00', 'clbits': '00'}]]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"cf83d08b95610b20edadafc927e046146b0a814641a1f07bdf335f6d67b80cc8","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    nq, nc, ops = x\n    q = [0] * nq\n    c = [0] * nc\n    for op in ops:\n        name = op[0]\n        if name == 'x':\n            q[op[1]] ^= 1\n        elif name == 'cx':\n            if q[op[1]]:\n                q[op[2]] ^= 1\n        elif name == 'ccx':\n            if q[op[1]] and q[op[2]]:\n                q[op[3]] ^= 1\n        elif name == 'swap':\n            a, b = op[1], op[2]\n            q[a], q[b] = q[b], q[a]\n        elif name == 'measure':\n            _, qb, cb = op\n            c[cb] = q[qb]\n        elif name == 'reset':\n            q[op[1]] = 0\n        elif name == 'x_if':\n            creg = sum(bit << i for i, bit in enumerate(c))\n            if creg == op[2]:\n                q[op[1]] ^= 1\n    return {'qubits': ''.join(str(b) for b in reversed(q)), 'clbits': ''.join(str(b) for b in reversed(c))}\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['control: reset excited qubit', [1, 1, [['x', 0], ['reset', 0], ['measure', 0, 0]]], {'qubits': '0', 'clbits': '0'}], ['control: toffoli one control', [3, 3, [['x', 0], ['ccx', 0, 1, 2]]], {'qubits': '001', 'clbits': '000'}], ['control: toffoli no controls', [3, 3, [['ccx', 0, 1, 2]]], {'qubits': '000', 'clbits': '000'}], ['control: measure into other clbit', [2, 2, [['x', 0], ['measure', 0, 1]]], {'qubits': '01', 'clbits': '10'}]], [['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['control: swap excitation', [2, 2, [['x', 0], ['swap', 0, 1]]], {'qubits': '10', 'clbits': '00'}], ['control: asymmetric output', [3, 3, [['x', 0], ['measure', 0, 0]]], {'qubits': '001', 'clbits': '001'}], ['control: random dynamic 0', [4, 4, [['cx', 2, 1], ['reset', 2], ['x_if', 1, 5], ['x_if', 3, 6], ['reset', 2], ['cx', 3, 1], ['swap', 1, 2], ['x', 0]]], {'qubits': '0001', 'clbits': '0000'}], ['control: random dynamic 1', [2, 2, [['cx', 1, 0], ['x_if', 0, 2], ['x', 1], ['swap', 0, 1], ['reset', 1], ['cx', 1, 0], ['x', 1]]], {'qubits': '11', 'clbits': '00'}]], [['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['control: random dynamic 2', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 1], ['x', 0], ['x_if', 2, 5], ['reset', 1], ['cx', 2, 0], ['swap', 1, 0], ['cx', 1, 0]]], {'qubits': '011', 'clbits': '010'}], ['control: random dynamic 3', [4, 4, [['ccx', 3, 0, 2], ['x_if', 1, 8], ['x_if', 1, 10], ['measure', 0, 3], ['reset', 0], ['measure', 0, 1]]], {'qubits': '0000', 'clbits': '0000'}], ['control: random dynamic 4', [2, 2, [['x', 0], ['measure', 1, 1]]], {'qubits': '01', 'clbits': '00'}], ['control: random dynamic 5', [4, 4, [['x_if', 1, 4], ['reset', 1], ['x_if', 1, 10], ['x', 0], ['measure', 2, 1], ['measure', 1, 0]]], {'qubits': '0001', 'clbits': '0000'}]], [['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['control: random dynamic 6', [2, 2, [['reset', 0], ['x', 1], ['swap', 1, 0], ['reset', 0], ['measure', 1, 0], ['x_if', 0, 1], ['cx', 0, 1], ['swap', 1, 0], ['cx', 1, 0]]], {'qubits': '00', 'clbits': '00'}], ['control: random dynamic 7', [4, 4, [['ccx', 1, 0, 2], ['x_if', 1, 6]]], {'qubits': '0000', 'clbits': '0000'}], ['control: random dynamic 8', [3, 3, [['reset', 2], ['x', 1], ['ccx', 0, 2, 1], ['measure', 1, 1], ['reset', 2]]], {'qubits': '010', 'clbits': '010'}], ['control: random dynamic 9', [2, 2, [['cx', 0, 1], ['cx', 0, 1], ['measure', 0, 0], ['swap', 0, 1], ['measure', 0, 1], ['swap', 0, 1], ['measure', 0, 1], ['measure', 0, 0], ['swap', 1, 0]]], {'qubits': '00', 'clbits': '00'}]], [['regression: feed-forward on register value 2', [2, 2, [['x', 1], ['measure', 1, 1], ['x_if', 0, 2]]], {'qubits': '11', 'clbits': '10'}], ['regression: random dynamic 59', [3, 3, [['cx', 2, 1], ['x', 1], ['measure', 1, 0], ['x_if', 0, 1], ['reset', 2]]], {'qubits': '011', 'clbits': '001'}], ['control: random dynamic 10', [3, 3, [['x', 2], ['measure', 2, 2], ['ccx', 2, 1, 0], ['swap', 0, 2], ['cx', 2, 0], ['x', 1], ['ccx', 2, 0, 1], ['cx', 2, 0], ['x', 1]]], {'qubits': '001', 'clbits': '100'}], ['control: random dynamic 11', [3, 3, [['reset', 2], ['x', 2]]], {'qubits': '100', 'clbits': '000'}], ['control: random dynamic 12', [3, 3, [['x', 1], ['x', 2]]], {'qubits': '110', 'clbits': '000'}], ['control: random dynamic 13', [2, 2, [['x_if', 1, 0], ['x', 0], ['swap', 1, 0], ['x', 1], ['cx', 1, 0], ['x_if', 1, 3], ['measure', 1, 1], ['swap', 1, 0], ['x', 1]]], {'qubits': '00', 'clbits': '00'}]]]\nfor label, args, expected in fixtures[N-1]:\n    check(label, solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"A deterministic bounded teaching model with a stipulated toy contract; amplitudes are rounded to fixed decimals for strict JSON output. It is not a production quantum SDK and claims no standards conformance. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-quantum_circuit_simulation-dynamic-circuit-basis-register-value-bit-order","generated_at":"2026-09-29T14:51:33.516782+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Feed-forward and reset semantics are central to dynamic circuits; register-value or reset slips change control flow.","repair":"Compute the value as sum(c[i] << i).","root_cause":"The register value is parsed from the clbit list as a binary string with clbit 0 as the most significant bit.","sha256":"c841e03a8cca2623050354024f029f8abbb7a93c9479945591727558d97b1f69","title":"Dynamic circuit condition reads the register big-endian · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":40.343,"exit_code":1,"observations":[{"actual":{"clbits":"10","qubits":"11"},"check":"regression: feed-forward on register value 2","expected":{"clbits":"10","qubits":"11"},"passed":true},{"actual":{"clbits":"001","qubits":"010"},"check":"regression: random dynamic 59","expected":{"clbits":"001","qubits":"011"},"passed":false},{"actual":{"clbits":"0","qubits":"0"},"check":"control: reset excited qubit","expected":{"clbits":"0","qubits":"0"},"passed":true},{"actual":{"clbits":"000","qubits":"001"},"check":"control: toffoli one control","expected":{"clbits":"000","qubits":"001"},"passed":true},{"actual":{"clbits":"000","qubits":"000"},"check":"control: toffoli no controls","expected":{"clbits":"000","qubits":"000"},"passed":true},{"actual":{"clbits":"10","qubits":"01"},"check":"control: measure into other 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\"actual\": {\"qubits\": \"001\", \"clbits\": \"000\"}, \"expected\": {\"qubits\": \"001\", \"clbits\": \"000\"}, \"passed\": true}, {\"check\": \"control: toffoli no controls\", \"actual\": {\"qubits\": \"000\", \"clbits\": \"000\"}, \"expected\": {\"qubits\": \"000\", \"clbits\": \"000\"}, \"passed\": true}, {\"check\": \"control: measure into other clbit\", \"actual\": {\"qubits\": \"01\", \"clbits\": \"10\"}, \"expected\": {\"qubits\": \"01\", \"clbits\": \"10\"}, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}