Drag¶

class Drag(duration, amp, sigma, beta, name=None)[ソース]¶

ベースクラス: qiskit.pulse.library.parametric_pulses.ParametricPulse

The Derivative Removal by Adiabatic Gate (DRAG) pulse is a standard Gaussian pulse with an additional Gaussian derivative component. It is designed to reduce the frequency spectrum of a normal gaussian pulse near the \(|1\rangle\) - \(|2\rangle\) transition, reducing the chance of leakage to the \(|2\rangle\) state.

\[f(x) = Gaussian + 1j * beta * d/dx [Gaussian] = Gaussian + 1j * beta * (-(x - duration/2) / sigma^2) [Gaussian]\]

where 『Gaussian』 is:

\[Gaussian(x, amp, sigma) = amp * exp( -(1/2) * (x - duration/2)^2 / sigma^2) )\]

参照

Gambetta, J. M., Motzoi, F., Merkel, S. T. & Wilhelm, F. K. Analytic control methods for high-fidelity unitary operations in a weakly nonlinear oscillator. Phys. Rev. A 83, 012308 (2011).

F. Motzoi, J. M. Gambetta, P. Rebentrost, and F. K. Wilhelm Phys. Rev. Lett. 103, 110501 – Published 8 September 2009.

Initialize the drag pulse.

パラメータ

duration (Union[int, ParameterExpression]) – Pulse length in terms of the the sampling period dt.
amp (Union[complex, ParameterExpression]) – The amplitude of the Drag envelope.
sigma (Union[float, ParameterExpression]) – A measure of how wide or narrow the Gaussian peak is; described mathematically in the class docstring.
beta (Union[float, ParameterExpression]) – The correction amplitude.
name (Optional[str]) – Display name for this pulse envelope.

Methods

`assign`	Assign one parameter to a value, which can either be numeric or another parameter expression.
`assign_parameters`	Return a new ParametricPulse with parameters assigned.
`draw`	Plot the interpolated envelope of pulse.
`get_waveform`	Return a Waveform with samples filled according to the formula that the pulse represents and the parameter values it contains.
`is_parameterized`	Return True iff the instruction is parameterized.
`validate_parameters`	Validate parameters.

Attributes

amp¶

The Gaussian amplitude.

戻り値の型: Union[complex, ParameterExpression]

beta¶

The weighing factor for the Gaussian derivative component of the waveform.

戻り値の型: Union[float, ParameterExpression]

id¶

Unique identifier for this pulse.

戻り値の型: int

limit_amplitude = True¶

parameters¶

戻り値の型: Dict[str, Any]

sigma¶

The Gaussian standard deviation of the pulse width.

戻り値の型: Union[float, ParameterExpression]