U2Gate

Bases: QubitGate, DifferentiableUnitary, CachedClass

The U2 single qubit gate.

It is given by the following parameterized unitary:

$\begin{pmatrix} \frac{\sqrt{2}}{2} & -\exp({i\theta_1})\frac{\sqrt{2}}{2} \\ \exp({i\theta_0})\frac{\sqrt{2}}{2} & \exp({i(\theta_0 + \theta_1)})\frac{\sqrt{2}}{2} \\ \end{pmatrix}$

__init__()

Attributes

`dim`	The matrix dimension for this unitary.
`name`	The name of this gate.
`num_params`	The number of real parameters this unitary-valued function takes.
`num_qudits`	The number of qudits this unitary can act on.
`qasm_name`	The qasm identifier for this gate.
`radixes`	The number of orthogonal states for each qudit.

Methods

`check_parameters`(params)	Check parameters are valid and match the unitary.
`get_grad`([params])	Return the gradient for this gate.
`get_inverse`()	Return the gate's inverse as a gate.
`get_inverse_params`([params])	Return the parameters that invert the gate.
`get_qasm`(params, location)	Returns the qasm string for this gate.
`get_qasm_gate_def`()	Returns a qasm gate definition block for this gate.
`get_unitary`([params])	Return the unitary for this gate, see `Unitary` for more.
`get_unitary_and_grad`([params])	Return a tuple combining the outputs of get_unitary and get_grad.
`is_constant`()	Return true if this unitary doesn't take parameters.
`is_parameterized`()	Return true if this unitary is parameterized.
`is_qubit_only`()	Return true if this unitary can only act on qubits.
`is_qudit_only`(radix)	Return true if this unitary can only act on radix-qudits.
`is_qutrit_only`()	Return true if this unitary can only act on qutrits.
`is_self_inverse`([params])	Checks whether the unitary is its own inverse.
`with_all_frozen_params`(params)	Freeze all of a gate's parameters so they don't change from optimization.
`with_frozen_params`(frozen_params)	Freeze some of a gate's parameters so they don't change from optimization.