What should we add?

Pulse builder still supports following commands that inject circuit gate operation into the pulse context:

• qiskit.pulse.builder.call_gate
• qiskit.pulse.builder.cx
• qiskit.pulse.builder.u1
• qiskit.pulse.builder.u2
• qiskit.pulse.builder.u3
• qiskit.pulse.builder.x

These are legacy workflow which we implemented before the pulse gate feature. These command introduce weird cyclic dependency between circuit and pulse program, and must be deprecated before the next release.

In addition, following commands are nice to be deprecated as well.

• qiskit.pulse.builder.active_transpiler_settings
• qiskit.pulse.builder.active_circuit_scheduler_settings
• qiskit.pulse.builder.transpiler_settings

Background

Note that the standard program representation in Qiskit is now QuantumCircuit, and pulse programs exist as a microcode (calibration) of the circuit. The pulse builder is a tool to define such microprograms, and circuit -> pulse conversion must be explicitly done with the circuit scheduler. Injecting circuit instruction in pulse program is indeed an opposite workflow.