Quantum bounds not so quantum after all

  The Researchers performed three classical experiment with that correspond to three famous quantum experiments involved quantum bonds.Quantum bounds are numbers such as 4,6,and 2√2 that naturally appear in quantum experiments, similar to how the number π emerge in circles.
     But just as how π popups in a wide variety of areas beyond of circles ,in a new study physicists have found that quantum bounds are not exclusive to quantum theory but also emerge in purely classical experiments.
    The maximum violation of a quantum inequality is the quantum bound. The quantum bounds arise from probability distribution in the experiment and are specific number for instance ,the Bell inequality has a quantum bound of 2√2 which is known as Tsirelson method.
     The result suggest that attempt to define quantumness should not be concerned with quantum bounds ,since there is nothing inherently quantum about them.