qiskit/releasenotes/notes/0.18/calibration-builder-no-echo...

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features:
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A new transpiler pass,
:class:`~qiskit.transpiler.passes.RZXCalibrationBuilderNoEcho`, was added
to the :mod:`qiskit.transpiler.passes` module. This pass is similar
to the existing :class:`~qiskit.transpiler.passes.RZXCalibrationBuilder`
in that it creates calibrations for an ``RZXGate(theta)``,
however :class:`~qiskit.transpiler.passes.RZXCalibrationBuilderNoEcho`
does this without inserting the echo pulses in the pulse schedule. This
enables exposing the echo in the cross-resonance sequence as gates so that
the transpiler can simplify them. The
:class:`~qiskit.transpiler.passes.RZXCalibrationBuilderNoEcho` pass only
supports the hardware-native direction of the
:class:`~qiskit.circuit.library.CXGate`.