pygsti.models.modelconstruction.create_operation

pygsti.models.modelconstruction.create_operation#

create_operation(op_expr, state_space, basis='pp', parameterization='full', evotype='default')#

Build an operation object from an expression.

Parameters:

  • op_expr (string) –

    expression for the gate to build. String is first split into parts delimited by the colon (:) character, which are composed together to create the final gate. Each part takes on of the allowed forms:

    • I(ssl_0, …) = identity operation on one or more state space labels (ssl_i)

    • X(theta, ssl) = x-rotation by theta radians of qubit labeled by ssl

    • Y(theta, ssl) = y-rotation by theta radians of qubit labeled by ssl

    • Z(theta, ssl) = z-rotation by theta radians of qubit labeled by ssl

    • CX(theta, ssl0, ssl1) = controlled x-rotation by theta radians. Acts on qubit labeled by ssl1 with ssl0 being the control.

    • CY(theta, ssl0, ssl1) = controlled y-rotation by theta radians. Acts on qubit labeled by ssl1 with ssl0 being the control.

    • CZ(theta, ssl0, ssl1) = controlled z-rotation by theta radians. Acts on qubit labeled by ssl1 with ssl0 being the control.

    • CNOT(ssl0, ssl1) = standard controlled-not gate. Acts on qubit labeled by ssl1 with ssl0 being the control.

    • CPHASE(ssl0, ssl1) = standard controlled-phase gate. Acts on qubit labeled by ssl1 with ssl0 being the control.

    • LX(theta, i0, i1) = leakage between states i0 and i1. Implemented as an x-rotation between states with integer indices i0 and i1 followed by complete decoherence between the states.

  • state_space (StateSpace) – The state space that the created operation should act upon.

  • basis (str or Basis) – The basis the returned operation should be represented in.

  • parameterization ({"full","TP","static"}, optional) –

    How to parameterize the resulting gate.

    • ”full” = return a FullArbitraryOp.

    • ”TP” = return a FullTPOp.

    • ”static” = return a StaticArbitraryOp.

  • evotype (Evotype or str, optional) – The evolution type of this operation, describing how states are represented. The special value “default” is equivalent to specifying the value of pygsti.evotypes.Evotype.default_evotype.

Returns:

A gate object representing the gate given by op_expr in the desired basis.

Return type:

LinearOperator