QUITS: A modular Qldpc code circUIT Simulator

Understand

To achieve quantum fault tolerance with lower overhead, quantum low-density parity-check (QLDPC) codes have emerged as a promising alternative to topological codes such as the surface code, offering higher code rates.

• To support their study, an end-to-end framework for simulating QLDPC codes at the circuit level is needed.
• In this work, we present QUITS, a modular and flexible circuit-level simulator for QLDPC codes.
• Its design allows users to freely combine LDPC code constructions, syndrome extraction circuits, decoding algorithms, and noise models, enabling comprehensive and customizable studies of the performance of QLDPC codes under circuit-level noise.