Quantum

The GHZ Game in Black and White

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 14/10/2026, 12:17:26 UTC.

Briefings

A new arXiv preprint (2610.14411) demonstrates that three parties can win the GHZ game using only real-valued quantum states, provided each participant holds two physical balls instead of one. This requires six total balls rather than the standard three, as complex number tagging requires a universal qubit that would enable information transfer. The study establishes a method to replace single qubits with local multi-qubit setups for non-locality proofs.

Key points

• Three parties can win the GHZ game using real-valued quantum states with six balls per participant instead of the standard three.
• Complex number tagging requires a universal qubit, which would allow information transfer; thus, local multi-qubit setups are required for non-locality proofs.

Context

This research addresses a fundamental limitation in quantum non-locality proofs by showing that standard quantum formalism can be adapted to real-valued states with increased resource requirements, specifically replacing single qubits with local multi-qubit configurations.

Limitations

The evidence is an unverified arXiv preprint (2610.14411v1) with no peer review or experimental validation. Specific dates, author names, and experimental results are not provided, and the feasibility of the proposed setup remains unconfirmed.

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