Tackling Coherent Noise in Quantum Computing via Cross-Layer Compiler
  Optimization
Quantum computing hardware is affected by quantum noise that undermine the
quality of results of an executed quantum program. Amongst other quantum
noises, coherent error that caused by parameter drifting and miscalibration,
remains critical. While coherent error mitigation has been studied before,
studies focused either on gate-level or pulse-level -- missing cross-level
optimization opportunities; And most of them only target single-qubit gates --
while multi-qubit gates are also used in practice.
  To address above limitations, this work proposes a cross-layer approach for
coherent error mitigation that considers program-level, gate-level, and
pulse-level compiler optimizations, by leveraging the hidden inverse theory,
and exploiting the structure inside different quantum programs, while also
considering multi-qubit gates. We implemented our approach as compiler
optimization passes, and integrated into IBM Qiskit framework. We tested our
technique on real quantum computer (IBM-Brisbane), and demonstrated up to 92%
fidelity improvements (45% on average), on several benchmarks.
Xiangyu Ren Junjie Wan Zhiding Liang Antonio Barbalace