qiskit/releasenotes/notes/0.16/add-pulse-builder-alignment...

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---
features:
- |
Two alignment contexts are added to the pulse builder
(:mod:`qiskit.pulse.builder`) to facilitate writing a repeated pulse
sequence with delays.
* :func:`qiskit.pulse.builder.align_equispaced` inserts delays with
equivalent length in between pulse schedules within the context.
* :func:`qiskit.pulse.builder.align_func` offers more advanced control of
pulse position. This context takes a callable that calculates a fractional
coordinate of i-th pulse and aligns pulses within the context. This makes
coding of dynamical decoupling easy.