THE concept of probability has always comprised two ideas: that of frequency in an ensemble and that of reasonable expectation. Suppose it is said that in tossing an unbiased coin the probabilities of ...

Measurement postulate is crucial to quantum mechanics. If we measure a quantum system, we can only get one of the eigenvalues of the measured observable, such as position, energy and so on, with a ...

In the double slit experiment, quantum objects such as photons or electrons are beamed through two closely spaced slits. Since we don't know which slit each object passes through, the possibilities ...