NEWS.USC.EDU - Aug 26 - Aram Galstyan and Greg Ver Steeg of the USC Information Sciences Institute are applying principles of quantum mechanics to the matchmaking algorithms that run eHarmony. Jonathan Beber, who leads eHarmony's data science, approached the ISI duo with a problem: how to reduce eHarmony's questionnaire; what is the minimum amount of questions eHarmony can ask without losing its predictive compatibility power. What started out with ~500 questions became 145 questions over time. Galstyan and Ver Steeg boiled down the questionnaire with a process called correlation explanation (CorEx). "The idea behind CorEx," Ver Steeg said, "is to ask what are the hidden factors that explain correlations in the data. For example, how different parts of your brain light up at the same time or the way you answer question A always predicts the way you answer question B."