Circuit.instantiate

Circuit.instantiate(target, method=None, multistarts=1, seed=None, multistart_gen=None, score_fn_gen=None, **kwargs)[source]

Instantiate the circuit with respect to a target state or unitary.

Attempts to change the parameters of the circuit such that the circuit either implements the target unitary or maps the zero state to the target state.

Parameters:

  • target (StateLike | UnitaryLike | StateSystem) – The target unitary or state. If a unitary is specified, the method changes the circuit’s parameters in an effort to get closer to implementing the target. If a state is specified, the method changes the circuit’s parameters in an effort to get closer to producing the target state when starting from the zero state.

  • method (str | Instantiater | None) – The method with which to instantiate the circuit. Currently, “qfactor” and “minimization” are supported. If left None, attempts to pick best method. You can also pass an Instantiater directly through this.

  • multistarts (int) – The number of starting points to sample instantiation with. (Default: 1)

  • seed (int | None) – The seed for any pseudo-random number generators to use. Note that this is not guaranteed to make this method reproducible.

  • multistart_gen (MultiStartGenerator) – (Deprecated)

  • score_fn_gen (CostFunctionGenerator) – (Deprecated)

  • kwargs (dict[str, Any]) – Method specific options, passed directly to method constructor. For more info, see bqskit.ir.opt.instantiaters.

Returns:

A reference to self is returned

Return type:

Circuit

Raises:

  • ValueError – If method is invalid.

  • ValueError – If circuit is incompatible with any method.

  • ValueError – If target dimension doesn’t match with circuit.

  • ValueError – If multistarts is not a positive integer.

  • ValueError – If seed is not an integer or None