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The theorem of Pusey, Barrett, and Rudolph proves that different quantumstates describe different physical realities. Their proof is based on theconstruction of entanglement measurement bases of two, and more than two qbits.In this note, I show that a two-qubit entanglement base is sufficient for ageneral proof.

Simpler proof of the theorem by Pusey, Barrett, and Rudolph on the reality of the quantum state