8000 cirq.ClassicallyControlledOperation raises "ValueError: Encountered unparseable op" · Issue #571 · quantumlib/qsim · GitHub
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cirq.ClassicallyControlledOperation raises "ValueError: Encountered unparseable op" #571

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rht opened this issue Dec 16, 2022 · 1 comment
Open

cirq.ClassicallyControlledOperation raises "ValueError: Encountered unparseable op" #571

rht opened this issue Dec 16, 2022 · 1 comment
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area/qsimcirq Involves the qsim-Cirq integration layer

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@rht
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rht commented Dec 16, 2022

Minimal reproducer:

import cirq
import qsimcirq

simulator = qsimcirq.QSimSimulator()

q = cirq.NamedQubit("q")
circuit = cirq.Circuit([
    cirq.measure(q, key="c"),
    cirq.ClassicallyControlledOperation(cirq.Z(q), "c")
])

simulator.simulate(circuit)

Traceback:

Traceback (most recent call last):
  File "***/minimal_reproducer.py", line 12, in <module>
    simulator.simulate(circuit)
  File "***/venv/lib/python3.10/site-packages/cirq/sim/simulator.py", line 491, in simulate
    return self.simulate_sweep(
  File "***/venv/lib/python3.10/site-packages/cirq/sim/simulator.py", line 506, in simulate_sweep
    return list(self.simulate_sweep_iter(program, params, qubit_order, initial_state))
  File "***/venv/lib/python3.10/site-packages/qsimcirq/qsim_simulator.py", line 519, in simulate_sweep_iter
    options["c"], _ = self._translate_circuit(
  File "***/venv/lib/python3.10/site-packages/qsimcirq/qsim_simulator.py", line 808, in _translate_circuit
    translated, moment_indices = translator_fn(qubit_order)
  File "***/venv/lib/python3.10/site-packages/qsimcirq/qsim_circuit.py", line 473, in translate_cirq_to_qtrajectory
    raise ValueError(f"Encountered unparseable op: {qsim_op}")
ValueError: Encountered unparseable op: Z(q).with_classical_controls(c)

Version:

cirq-core==1.0.0
qsimcirq==0.14.0

I happened to encounter this unsupported feature by chance. But I think it would be great if there is a comprehensive list of features still not yet supported by qsimcirq.
@95-martin-orion
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See also: #149

@mhucka mhucka added the area/qsimcirq Involves the qsim-Cirq integration layer label May 11, 2025
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@rht @mhucka @95-martin-orion
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