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temperature, which would destroyed the entanglement in the system. It seems that other quantum process is at work to enable the successful implement of Shor's algorithm (to factorize the number 15 into 5 and 3). Someone suggested quantum discord as the explanation. Discord is an obscure measure of quantum correlations first proposed in 2000. It quantifies the degree of disruption during observation of a system. Macroscopic systems have zero discord because they are not affected by observation. But quantum systems are unavoidably affected, since measurement forces them to settle on one of their many superposition values, so any possible quantum correlations including entanglement, give a positive value for discord. A discord-based
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