Unconditional quantum advantage from a two-round CHSH problem in one dimension
A new relation problem constructed from the CHSH game, called the two-round one-dimensional CHSH problem, is introduced. Its two-round design supplies CHSH questions only after relevant Pauli-frame data have been fixed, which the authors say removes a simple classical strategy. The paper claims this structure yields an unconditional quantum advantage.
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What this could mean
- 0–2 yearsPlausible
The two-round CHSH problem could become a compact benchmark for demonstrating unconditional quantum advantage on existing two-qubit hardware.
CHSH games are already standard for Bell tests and can be implemented with local measurements on current superconducting, trapped-ion, and photonic devices. If the two-round structure reduces loopholes or assumptions, experimental groups could use the relation problem to claim a provable separation without needing large-scale fault-tolerant machines.
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