Quantum

CSS Circuits: useful quantum circuits that can be simulated with $O(1)$ cost per gate

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 13/11/2026, 07:43:25 UTC.

Briefings

A new quantum circuit simulator was developed for CSS circuits, achieving O(1) work per gate. This simulator proves CSS circuits are ideal for benchmarking quantum error correction against atom loss errors, while Bell inequalities confirm they cannot support Hadamard, CZ, or S gates.

Key points

• CSS circuits are quantum circuits generated by X, Z, M_X, M_Z, and CNOT gates.
• The simulator uses O(1) work per gate and proves CSS circuits cannot support Hadamard, CZ, or S gates via Bell inequalities.

Context

CSS circuits are a restricted class of quantum circuits used for protocols like teleportation and error correction. The new simulator provides a local hidden variable model proof of their computational limits.

Limitations

Evidence is limited to the arXiv preprint v1, which may not reflect final experimental results. The O(1) cost claim is theoretical and does not account for physical implementation overheads.

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