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This research eliminates the restrictive assumption of symmetric projective maximally entangled (PME) states in robust self-testing protocols for non-local games. By proving that perfect synchronous games apply to all quantum strategies via an operator-algebraic approach, the study significantly broadens the physical relevance and scope of device verification methods. The work also establishes the Quantum Low Degree Test as efficient for n-qubit systems, advancing our ability to assess quantum hardware without idealized constraints.
Quantum self-testing no longer relies on ideal entanglement

New research lifts restrictions on robust self-testing in non-local games, proving any perfect synchronous game certified with PME strategies works for all strategies.
Matthijs Vernooij of Delft Institute of Applied Mathematics and Yuming Zhao of the University of Copenhagen have removed a key limitation in quantum…
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