qoqo.operations.PragmaSetDensityMatrix

class qoqo.operations.PragmaSetDensityMatrix

This PRAGMA operation sets the density matrix of a quantum register.

The Circuit() module automatically initializes the qubits in the |0> state, so this PRAGMA operation allows you to set the state of the qubits by setting a density matrix of your choosing.

Parameters:: density_matrix (a 2d array of complex numbers) – The density matrix that is initialized.

__init__()

Methods

`__init__`()
`density_matrix`()	Return the set density matrix.
`hqslang`()	Return hqslang name of the operation.
`involved_qubits`()	List all involved qubits (here, all).
`is_parametrized`()	Return true when the operation has symbolic parameters.
`remap_qubits`(mapping)	Remap qubits in a clone of the PRAGMA operation.
`substitute_parameters`(substitution_parameters)	Substitute the symbolic parameters in a clone of the PRAGMA operation according to the input.
`tags`()	Return tags classifying the type of the operation.

density_matrix()

Return the set density matrix.

Returns:: The density matrix (2d array) representing the qubit register.
Return type:: np.ndarray

hqslang()

Return hqslang name of the operation.

Returns:: The hqslang name of the operation.
Return type:: str

involved_qubits()

List all involved qubits (here, all).

Returns:: The involved qubits of the PRAGMA operation.
Return type:: set[int]

is_parametrized()

Return true when the operation has symbolic parameters.

Returns:: True if the operation contains symbolic parameters, False if it does not.
Return type:: bool

remap_qubits(mapping)

Remap qubits in a clone of the PRAGMA operation.

Parameters:: mapping (dict[int, int]) – The dictionary containing the {qubit: qubit} mapping to use in the PRAGMA operation.
Returns:: The PRAGMA operation with the qubits remapped.
Return type:: self
Raises:: RuntimeError – The qubit remapping failed.

substitute_parameters(substitution_parameters)

Substitute the symbolic parameters in a clone of the PRAGMA operation according to the input.

Parameters:: substitution_parameters (dict[str, float]) – The dictionary containing the substitutions to use in the PRAGMA operation.
Returns:: The PRAGMA operation with the parameters substituted.
Return type:: self
Raises:: RuntimeError – The parameter substitution failed.

tags()

Return tags classifying the type of the operation.

Used for type based dispatch in ffi interfaces.

Returns:: The tags of the Operation.
Return type:: list[str]