AccQOC: Accelerating Quantum Optimal Control Based Pulse Generation
Jinglei Cheng, Haoqing Deng, Xuehai Qian
In the last decades, we have witnessed the rapid growth of Quantum Computing.
In the current Noisy Intermediate-Scale Quantum (NISQ) era, the capability of a
quantum machine is limited by the decoherence time, gate fidelity and the
number of Qubits. Current quantum computing applications are far from the real
"quantum supremacy" due to the fragile physical Qubits, which can only be
entangled for a few microseconds. Recent works use quantum optimal control to
reduce the latency of quantum circuits, thereby effectively increasing quantum
volume. However, the key challenge of this technique is the large overhead due
to long compilation time. In this paper, we propose AccQOC, a comprehensive
static/dynamic hybrid workflow to transform gate groups (equivalent to
matrices) to pulses using QOC (Quantum Optimal Control) with a reasonable
compilation time budget. AccQOC is composed of static pre-compilation and
accelerated dynamic compilation. With the methodology of AccQOC, we reached a
balanced point of compilation time and overall latency. The results show that
accelerated compilation based on MST achieves 9.88x compilation speedup
compared to the standard compilation of each group while maintaining an average
2.43x latency reduction compared with gate-based compilation.