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This research demonstrates a specific instance of quantum supremacy by utilizing pre-shared entanglement to compress four input bits into one or two qubits with success rates exceeding classical limits. By establishing optimal probabilities and introducing a verification layer, the study advances semi-device-independent protocols essential for building secure future quantum networks. The work confirms that entanglement-assisted random-access codes offer scalable advantages over standard communication methods in defined physical regimes.
4-to-2 Quantum Code Achieves Supremacy Over Classical Methods

Researchers demonstrated a 4-to-2 entanglement-assisted prepare-measure random-access code, surpassing classical methods and establishing quantum supremacy.
Researchers Rajdeep Paul, Prabuddha Roy, and A. Pan report a specific instance of quantum supremacy using a 4-to-1 code, in which four input bits are compressed into either…
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