Simpler proof of the theorem by Pusey, Barrett, and Rudolph on the   reality of the quantum state
  The theorem of Pusey, Barrett, and Rudolph proves that different quantum states describe different physical realities. Their proof is based on the construction 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 a general proof. 
C. Moseley
quant-ph