qiskit/releasenotes/notes/0.25/gaussian-square-echo-pulse-...

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---
features:
- |
Add new :meth:`~qiskit.pulse.gaussian_square_echo` pulse shape. This pulse
is composed by three :class:`~qiskit.pulse.GaussianSquare` pulses. The
first two are echo pulses with duration half of the total duration and
implement rotary tones. The third pulse is a cancellation tone that lasts
the full duration of the pulse and implements correcting single qubit
rotations.