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arXiv · 2605.14042

C-Phase-Aware Compilation for Efficient Fault-Tolerant Quantum Execution

Dhanvi Bharadwaj·Siddharth Dangwal·Yuewen Hou·Gokul Subramanian Ravi
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Abstract

Achieving practical quantum advantage on fault-tolerant quantum computers (FTQC) is fundamentally constrained by the substantial spatial and temporal overheads required to map logical operations onto physical hardware. Existing compilation approaches typically adopt coarse-grained, slice-based abstractions that overlook fine-grained microarchitectural effects, such as routing contention, leading to inefficient resource utilization and limited alignment between algorithm structure and hardware capabilities. We introduce Qomet, a microarchitecture-aware compiler that tightly couples algorithmic properties with lattice surgery (LS) execution. By exploiting C-Phase gate commutativity, Qomet translates sequential operations into simultaneous multi-target interactions, natively leveraging LS to eliminate false dependencies and expose instruction-level parallelism. To support this, Qomet employs an adaptive, event-driven scheduler that captures precise spatial and routing constraints to overlap instructions temporally. By minimizing grid idling and routing contention, Qomet achieves a geometric-mean execution speedup of 4.29$\times$ and a maximum speedup of 59.7$\times$ across realistic workloads.

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Dhanvi Bharadwaj, Siddharth Dangwal, Yuewen Hou, Gokul Subramanian Ravi. 2026-05-13. C-Phase-Aware Compilation for Efficient Fault-Tolerant Quantum Execution. https://arxiv.org/abs/2605.14042

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