clifft-cirq

clifft-cirq converts parameter-resolved qubit cirq.Circuit instances into Clifft circuit text and provides a small Cirq-style sampler facade on top of Clifft. Parameter-resolved means the circuit has no symbolic parameters left, for example after cirq.resolve_parameters.

See Clifft's front-end integrations guide for how this adapter fits with other Clifft front ends.

import cirq
import clifft_cirq

q0, q1 = cirq.LineQubit.range(2)
circuit = cirq.Circuit(
    cirq.H(q0),
    cirq.CNOT(q0, q1),
    cirq.measure(q0, q1, key="m"),
)

converted = clifft_cirq.to_clifft_text(circuit)
print(converted.clifft_text)

sampler = clifft_cirq.ClifftSampler(seed=123)
result = sampler.run(circuit, repetitions=1000)

The converter returns:

• clifft_text: text accepted by Clifft's parser.
• qubit_map: the deterministic mapping from Cirq qubits to Clifft integer qubits.
• measurement_map: measurement-key metadata used to rebuild a cirq.Result.

Supported

• Qubit circuits with parameter-resolved operations.
• Sampling behavior and measurement distributions up to unconditional global phase.
• Mid-circuit measurements and resets.
• Measurement keys that appear once each.
• Common one-, two-, and three-qubit gates, including H, Pauli gates, special-angle axis powers, CX, CZ, SWAP, ISWAP, CH, CCX, CCZ, and Clifft half-turn rotations such as R_X and R_ZZ.
• Operations that Cirq can decompose into supported operations.

The converter uses rotations instead of same-named Clifft sqrt gates when Clifft and Cirq conventions differ. Unsupported operations raise UnsupportedCirqOperationError with the failing operation.

Unsupported

• Qudits.
• Unresolved symbolic parameters at the to_clifft_text boundary.
• Repeated measurement keys, such as cirq.measure(q0, key="m") followed by cirq.measure(q1, key="m").
• Arbitrary classical control.
• Measurement confusion maps.
• Cirq noise channels.
• Device, timing, calibration, duration, and tag semantics.
• Stochastic noise, leakage, loss, and other noncomputational models.

Development

uv sync --group dev
uv run pytest
uv run ruff check .
uv run ruff format --check .

The package depends on clifft>=0.8 and uses its symbolic compiler and sampler APIs. CI should keep testing both the Cirq floor and the latest allowed cirq-core<2 range.