Experimental certification of a 4-qubit GHZ state using a device-independent framework, implying enhanced quantum resource authentication.
Authentication of quantum resources is crucial for quantum protocols. We adopt Gocanin et al. [3] protocol to experimentally certify a four-photon GHZ state in a device-independent framework, without assuming identically and independently distributed states. This certification is performed using our compact, high-fidelity entangled photon source.
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Martins et al. (2025) studied this question.
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