Interaction

class Interaction(num_modes, u, label=None)

On-site interaction of particles of opposite spin species on the same site.

The generating Hamiltonian of the interaction gate is

\(H = U \sum_{i=1}^{L} n_{i,\uparrow} n_{i,\downarrow}\)

where \(i\) indexes the mode, \(L\) gives the total number of sites and \(U\) is the interaction strength

Initialize interaction gate.

Parameters:

• num_modes (int) – number of modes on which the gate acts

• u (float) – global interaction strength parameter

• label – optional

Raises:

QiskitColdAtomError – If the number of wires the gate acts on is uneven

Attributes

Interaction.condition_bits	Get Clbits in condition.
Interaction.decompositions	Get the decompositions of the instruction from the SessionEquivalenceLibrary.
Interaction.definition	Return definition in terms of other basic gates.
Interaction.duration	Get the duration.
Interaction.generator	The generating Hamiltonian of the interaction gate.
Interaction.label	Return instruction label
Interaction.name	Return the name.
Interaction.num_clbits	Return the number of clbits.
Interaction.num_qubits	Return the number of qubits.
Interaction.params	return instruction params.
Interaction.unit	Get the time unit of duration.

Methods

Interaction.add_decomposition(decomposition)	Add a decomposition of the instruction to the SessionEquivalenceLibrary.
Interaction.assemble()	Assemble a QasmQobjInstruction
Interaction.broadcast_arguments(qargs, cargs)	Validation and handling of the arguments and its relationship.
Interaction.c_if(classical, val)	Set a classical equality condition on this instruction between the register or cbit classical and value val.
Interaction.control([num_ctrl_qubits, ...])	Overwrite control method which is supposed to return a controlled version of the gate.
Interaction.copy([name])	Copy of the instruction.
Interaction.inverse()	Get inverse gate by reversing the sign of the interaction parameter
Interaction.is_parameterized()	Return True .IFF.
Interaction.operator_to_mat(generator, ...)	Compute the matrix representation of the fermion operator.
Interaction.power(exponent)	Creates a fermionic gate as gate^exponent
Interaction.qasm()	Return a default OpenQASM string for the instruction.
Interaction.repeat(n)	Creates an instruction with gate repeated n amount of times.
Interaction.reverse_ops()	For a composite instruction, reverse the order of sub-instructions.
Interaction.soft_compare(other)	Soft comparison between gates.
Interaction.to_matrix([num_species, basis])	Return a Numpy.array for the gate unitary matrix.
Interaction.validate_parameter(parameter)	Gate parameters should be int, float, or ParameterExpression