Spaces:
Running
Running
File size: 8,061 Bytes
6ce350d |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 |
"""
Syntax Checker - Basic sanity checks for quantum circuits.
Validates gate names, qubit indices, and parameter counts.
"""
from typing import Any
from ...core.exceptions import (
QubitIndexError,
CircuitParseError,
ValidationError,
)
# Valid gate definitions: name -> (num_qubits, num_params)
VALID_GATES: dict[str, tuple[int, int]] = {
# Single qubit gates (no params)
"id": (1, 0), "i": (1, 0),
"x": (1, 0), "y": (1, 0), "z": (1, 0),
"h": (1, 0),
"s": (1, 0), "sdg": (1, 0),
"t": (1, 0), "tdg": (1, 0),
"sx": (1, 0), "sxdg": (1, 0),
# Single qubit gates (1 param)
"rx": (1, 1), "ry": (1, 1), "rz": (1, 1),
"p": (1, 1), "u1": (1, 1),
# Single qubit gates (2 params)
"u2": (1, 2),
# Single qubit gates (3 params)
"u": (1, 3), "u3": (1, 3),
# Two qubit gates (no params)
"cx": (2, 0), "cnot": (2, 0),
"cy": (2, 0), "cz": (2, 0),
"swap": (2, 0), "iswap": (2, 0),
"ch": (2, 0),
# Two qubit gates (1 param)
"cp": (2, 1), "crx": (2, 1), "cry": (2, 1), "crz": (2, 1),
"rxx": (2, 1), "ryy": (2, 1), "rzz": (2, 1),
# Three qubit gates
"ccx": (3, 0), "toffoli": (3, 0),
"cswap": (3, 0), "fredkin": (3, 0),
# Special operations
"measure": (1, 0),
"reset": (1, 0),
"barrier": (-1, 0), # -1 means any number of qubits
}
def check_syntax(circuit_data: dict[str, Any]) -> dict[str, Any]:
"""
Perform comprehensive syntax validation on a circuit.
Args:
circuit_data: Circuit dictionary with gates and metadata
Returns:
Validation result dictionary
"""
errors: list[str] = []
warnings: list[str] = []
num_qubits = circuit_data.get("num_qubits", 0)
num_classical_bits = circuit_data.get("num_classical_bits", 0)
gates = circuit_data.get("gates", [])
# Check basic circuit structure
if num_qubits <= 0:
errors.append("Circuit must have at least 1 qubit")
if not gates:
warnings.append("Circuit has no gates")
# Validate each gate
for idx, gate in enumerate(gates):
gate_errors = _validate_gate(gate, num_qubits, num_classical_bits, idx)
errors.extend(gate_errors)
# Check for potential issues
circuit_warnings = _check_circuit_warnings(gates, num_qubits)
warnings.extend(circuit_warnings)
is_valid = len(errors) == 0
return {
"valid": is_valid,
"errors": errors,
"warnings": warnings,
"gates_checked": len(gates),
"summary": "Circuit syntax is valid" if is_valid else f"Found {len(errors)} syntax error(s)",
}
def _validate_gate(
gate: dict[str, Any],
num_qubits: int,
num_classical_bits: int,
gate_idx: int
) -> list[str]:
"""Validate a single gate."""
errors: list[str] = []
name = gate.get("name", "").lower()
qubits = gate.get("qubits", [])
params = gate.get("params", [])
classical_bits = gate.get("classical_bits", [])
prefix = f"Gate {gate_idx} ({name})"
# Check gate name
if not name:
errors.append(f"{prefix}: Missing gate name")
return errors
if name not in VALID_GATES:
errors.append(f"{prefix}: Unknown gate '{name}'")
return errors
expected_qubits, expected_params = VALID_GATES[name]
# Check qubit count
if expected_qubits > 0 and len(qubits) != expected_qubits:
errors.append(
f"{prefix}: Expected {expected_qubits} qubit(s), got {len(qubits)}"
)
# Check qubit indices
for q in qubits:
if not isinstance(q, int):
errors.append(f"{prefix}: Qubit index must be integer, got {type(q).__name__}")
elif q < 0 or q >= num_qubits:
errors.append(
f"{prefix}: Qubit index {q} out of range (valid: 0-{num_qubits-1})"
)
# Check for duplicate qubits
if len(qubits) != len(set(qubits)):
errors.append(f"{prefix}: Duplicate qubit indices detected")
# Check parameter count
param_count = len([p for p in params if not (isinstance(p, str) and p.startswith("param:"))])
if expected_params > 0 and param_count < expected_params:
# Allow parameterized circuits with symbolic params
if not any(isinstance(p, str) and p.startswith("param:") for p in params):
errors.append(
f"{prefix}: Expected {expected_params} parameter(s), got {param_count}"
)
# Check classical bits for measurements
if name == "measure":
if not classical_bits:
errors.append(f"{prefix}: Measurement requires classical bit(s)")
for c in classical_bits:
if not isinstance(c, int):
errors.append(f"{prefix}: Classical bit index must be integer")
elif c < 0 or c >= num_classical_bits:
errors.append(
f"{prefix}: Classical bit {c} out of range (valid: 0-{num_classical_bits-1})"
)
return errors
def _check_circuit_warnings(gates: list[dict[str, Any]], num_qubits: int) -> list[str]:
"""Check for potential issues in the circuit."""
warnings: list[str] = []
# Track which qubits have been used
used_qubits: set[int] = set()
measured_qubits: set[int] = set()
gates_after_measure: dict[int, int] = {}
for gate in gates:
qubits = gate.get("qubits", [])
name = gate.get("name", "").lower()
for q in qubits:
used_qubits.add(q)
if q in measured_qubits and name not in ("measure", "reset", "barrier"):
gates_after_measure[q] = gates_after_measure.get(q, 0) + 1
if name == "measure":
for q in qubits:
measured_qubits.add(q)
# Warn about unused qubits
unused = set(range(num_qubits)) - used_qubits
if unused:
warnings.append(f"Unused qubits: {sorted(unused)}")
# Warn about gates after measurement
for q, count in gates_after_measure.items():
warnings.append(
f"Qubit {q} has {count} gate(s) after measurement (may collapse state)"
)
return warnings
def validate_qasm_syntax(qasm_string: str) -> dict[str, Any]:
"""
Validate OpenQASM syntax without parsing into circuit.
Args:
qasm_string: QASM code string
Returns:
Validation result
"""
errors: list[str] = []
warnings: list[str] = []
lines = qasm_string.strip().split('\n')
has_openqasm = False
has_include = False
has_qreg = False
for line_num, line in enumerate(lines, 1):
line = line.strip()
if not line or line.startswith('//'):
continue
if line.startswith('OPENQASM'):
has_openqasm = True
if '2.0' not in line and '3.0' not in line:
warnings.append(f"Line {line_num}: Unusual OPENQASM version")
elif line.startswith('include'):
has_include = True
elif line.startswith('qreg'):
has_qreg = True
if '[' not in line or ']' not in line:
errors.append(f"Line {line_num}: Invalid qreg syntax")
elif line.startswith('creg'):
if '[' not in line or ']' not in line:
errors.append(f"Line {line_num}: Invalid creg syntax")
elif not line.endswith(';'):
if not line.startswith('gate ') and not line.startswith('{') and line != '}':
errors.append(f"Line {line_num}: Statement should end with semicolon")
if not has_openqasm:
warnings.append("Missing OPENQASM header")
if not has_qreg:
errors.append("No quantum register defined")
return {
"valid": len(errors) == 0,
"errors": errors,
"warnings": warnings,
"lines_checked": len(lines),
}
|