# cirq.CCXPowGate¶

class cirq.CCXPowGate(*, exponent: Union[sympy.core.basic.Basic, float] = 1.0, global_shift: float = 0.0)[source]

A Toffoli (doubly-controlled-NOT) that can be raised to a power.

The matrix of CCX**t is an 8x8 identity except the bottom right 2x2 area
is the matrix of X**t.
__init__(*, exponent: Union[sympy.core.basic.Basic, float] = 1.0, global_shift: float = 0.0) → None

Initializes the parameters used to compute the gate’s matrix.

The eigenvalue of each eigenspace of a gate is computed by

1. Starting with an angle in half turns as returned by the gate’s
_eigen_components method:
θ

2. Shifting the angle by global_shift:

θ + s

3. Scaling the angle by exponent:

(θ + s) * e

4. Converting from half turns to a complex number on the unit circle:

exp(i * pi * (θ + s) * e)

Parameters: exponent – The t in gate**t. Determines how much the eigenvalues of the gate are scaled by. For example, eigenvectors phased by -1 when gate**1 is applied will gain a relative phase of e^{i pi exponent} when gate**exponent is applied (relative to eigenvectors unaffected by gate**1). global_shift – Offsets the eigenvalues of the gate at exponent=1. In effect, this controls a global phase factor on the gate’s unitary matrix. The factor is: exp(i * pi * global_shift * exponent) For example, cirq.X**t uses a global_shift of 0 but cirq.Rx(t) uses a global_shift of -0.5, which is why cirq.unitary(cirq.Rx(pi)) equals -iX instead of X.

Methods

 controlled_by(*control_qubits) Returns a controlled version of this gate. num_qubits() The number of qubits this gate acts on. on(*qubits) Returns an application of this gate to the given qubits. qubit_index_to_equivalence_group_key(index) Returns a key that differs between non-interchangeable qubits. validate_args(qubits) Checks if this gate can be applied to the given qubits. wrap_in_linear_combination(coefficient, …)

Attributes