---
title: Drag (v1.4)
description: API reference for qiskit.pulse.library.Drag in qiskit v1.4
source: https://eu-de.quantum.cloud.ibm.com/docs/en/api/qiskit/1.4/qiskit.pulse.library.Drag
---

# Drag

*class* `qiskit.pulse.library.Drag(duration, amp, sigma, beta, angle=0.0, name=None, limit_amplitude=None)`

Bases: [`object`](https://docs.python.org/3/library/functions.html#object)

The Derivative Removal by Adiabatic Gate (DRAG) pulse is a standard Gaussian pulse with an additional Gaussian derivative component and lifting applied.

It can be calibrated either to reduce the phase error due to virtual population of the $|2\rangle$ state during the pulse or to reduce the frequency spectrum of a standard Gaussian pulse near the $|1\rangle\leftrightarrow|2\rangle$ transition, reducing the chance of leakage to the $|2\rangle$ state.

$$
\begin{aligned}
g(x) &= \exp\Bigl(-\frac12 \frac{(x - \text{duration}/2)^2}{\text{sigma}^2}\Bigr)\\
g'(x) &= \text{A}\times\frac{g(x)-g(-1)}{1-g(-1)}\\
f(x) &=  g'(x) \times \Bigl(1 + 1j \times \text{beta} \times            \Bigl(-\frac{x - \text{duration}/2}{\text{sigma}^2}\Bigr)  \Bigr),
\quad 0 \le x < \text{duration}
\end{aligned}
$$

where $g(x)$ is a standard unlifted Gaussian waveform, $g'(x)$ is the lifted [`Gaussian`](/docs/api/qiskit/1.4/qiskit.pulse.library.Gaussian "qiskit.pulse.library.Gaussian") waveform, and $\text{A} = \text{amp} \times \exp\left(i\times\text{angle}\right)$.

**References**

1. [*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).*](https://link.aps.org/doi/10.1103/PhysRevA.83.012308)

2. [*F. Motzoi, J. M. Gambetta, P. Rebentrost, and F. K. Wilhelm Phys. Rev. Lett. 103, 110501 – Published 8 September 2009.*](https://link.aps.org/doi/10.1103/PhysRevLett.103.110501)

> **Deprecated since version 1.3**
>
> The class `qiskit.pulse.library.symbolic_pulses.Drag` is deprecated as of Qiskit 1.3. It will be removed in Qiskit 2.0. The entire Qiskit Pulse package has been deprecated.

## Attributes

### alias

Default value: `'Drag'`