Open Quantum Assembly Language
summary
A new OpenQASM version claims to add real-time classical control and pulse-level hardware control while remaining backwards compatible with OpenQASM2 programs. It introduces real-time classical features like variables, loops, counters and measurement feedback for within-qubit-lifetime decisions, gate modifiers (inverse, control, power, global phase), timing/alignment (example: place a U gate one third through a CX), and pulse-level control with phase shifts and custom pulse shapes. The spec reduces built-ins to a single built-in U gate with standard gates provided in a header and supports extern linking to controller/FPGA functions.
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