SpinCircuitSolver¶

class SpinCircuitSolver(spin=Fraction(1, 2), shots=None, seed=None)[source]¶

Performs numerical simulations of spin systems by exactly computing the time evolution under unitary operations generated by exponentiating spin Hamiltonians.

Initialize a spin circuit solver.

Parameters:

spin (Union[float, Fraction]) – The length of the spin of each wire in the circuit.
shots (Optional[int]) – Amount of shots for the measurement simulation; if not None, measurements are performed.
seed (Optional[int]) – The seed for the RNG for the measurement simulation.

Raises:

QiskitColdAtomError – if the spin is not a positive integer or half-integer.

Attributes

`SpinCircuitSolver.dim`	Return the dimension set by the last quantum circuit on which the solver was called.
`SpinCircuitSolver.ignore_barriers`	Boolean flag that defines how barrier instructions in the circuit are handled.
`SpinCircuitSolver.max_dimension`	The maximal Hilbert space dimension of the simulation.
`SpinCircuitSolver.seed`	The seed for the random number generator of the measurement simulation.

Methods

`SpinCircuitSolver.__call__`(circuit)	Performs the simulation of the circuit: Each operator is converted into a sparse matrix over the basis and is then exponentiated to get the unitary of the gate.
`SpinCircuitSolver.draw_shots`(...)	A helper function to draw counts from a given distribution of measurement outcomes.
`SpinCircuitSolver.get_initial_state`(circuit)	Return the initial state as a sparse column vector.
`SpinCircuitSolver.operator_to_mat`(operator)	Convert a SpinOp describing a gate generator to a sparse matrix.
`SpinCircuitSolver.preprocess_circuit`(circuit)	Compute the Hilbert space dimension of the given quantum circuit as \((2S+1)^N\) where \(S\) is the length of the spin and \(N\) is the number of spins in the quantum circuit.
`SpinCircuitSolver.to_operators`(circuit)	Convert a circuit to a list of second quantized operators that describe the generators of the gates applied to the circuit.
`SpinCircuitSolver.__call__`(circuit)	Performs the simulation of the circuit: Each operator is converted into a sparse matrix over the basis and is then exponentiated to get the unitary of the gate.