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Execution of quantum algorithms requires a quantum computer architecture witha dedicated quantum instruction set that is capable of supporting translationof workloads into actual quantum operations acting on the qubits.State-of-the-art qubit control setups typically utilize general purpose testinstruments such as arbitrary waveform generators (AWGs) to generate a limitedset of waveforms or pulses. These waveforms are precomputed and stored prior toexecution, and then used to produce control pulses during execution. Besidestheir prohibitive cost and limited scalability, such instruments suffer frompoor programmability due to the absence of an instruction set architecture(ISA). Limited memory for pulse storage ultimately determines the total numberof supported quantum operations. In this work, we present a scalable qubitcontrol system that enables efficient qubit control using a flexible ISA todrive a direct digital synthesis (DDS) pipeline producing nanosecond-accuratequbit control signals dynamically. The designed qubit controller provides ahigher density of control channels, a scalable design, better programmability,and lower cost compared to state-of-the-art systems. In this work, we discussthe new qubit controller's capabilities, its architecture and instruction set,and present experimental results for coherent qubit control.

A Scalable Microarchitecture for Efficient Instruction-Driven Signal Synthesis and Coherent Qubit Control