Abstract base class to create gatesets that can be used as targets for compilation.

Inherits From: Gateset

An instance of this type can be passed to transformers like cirq.convert_to_target_gateset, which can transform any given circuit to contain gates accepted by this gateset.

*gates A list of cirq.Gate subclasses / cirq.Gate instances / cirq.GateFamily instances to initialize the Gateset.
name (Optional) Name for the Gateset. Useful for description.
unroll_circuit_op If True, cirq.CircuitOperation is recursively validated by validating the underlying cirq.Circuit.



num_qubits Maximum number of qubits on which a gate from this gateset can act upon.
postprocess_transformers List of transformers which should be run after decomposing individual operations.
preprocess_transformers List of transformers which should be run before decomposing individual operations.



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Method to rewrite the given operation using gates from this gateset.

op cirq.Operation to be rewritten using gates from this gateset.
moment_idx Moment index where the given operation op occurs in a circuit.


  • An equivalent cirq.OP_TREE implementing op using gates from this gateset.
  • None or NotImplemented if does not know how to decompose op.


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Validates gates forming circuit_or_optree should be contained in Gateset.

circuit_or_optree The cirq.Circuit or cirq.OP_TREE to validate.


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Returns a copy of this Gateset with identical gates and new values for named arguments.

If a named argument is None then corresponding value of this Gateset is used instead.

name New name for the Gateset.
unroll_circuit_op If True, new Gateset will recursively validate cirq.CircuitOperation by validating the underlying cirq.Circuit.

self if all new values are None or identical to the values of current Gateset. else a new Gateset with identical gates and new values for named arguments.


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Check for containment of a given Gate/Operation in this Gateset.

Containment checks are handled as follows:

The complexity of the method in terms of the number of gates, n, is

  • O(1) when any default cirq.GateFamily instance accepts the given item, except for an Instance GateFamily trying to match an item with a different global phase.
  • O(n) for all other cases: matching against custom gate families, matching across global phase for the default Instance GateFamily, no match against any underlying gate family.

item The cirq.Gate or cirq.Operation instance to check containment for.


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