50 & 100 years ago

Peng Huan-Wu

As the author has the privilege of being associated with Born in Edinburgh during 1938—1941 and 1943—1945,and with Schrdinger in Dublin during 1941—1943 and 1945—1947,the beginning of quantum mechanics 80 years ago is described here with reminiscences,and also with an emphasis on the evolution of scientific ideas.

Arnold Neumaier

The details of the contents and formulations of the Born rule have changed considerably from its inception by Born in 1926 to the present day. This paper traces the early history of the Born rule 100 years ago, its generalization (essential for today's quantum optics and quantum information theory) to POVMs around 50 years ago, and a modern derivation from an intuitive definition of the notion of a quantum detector. Also discussed is the extent to which the various forms of the Born rule have, like any other statement in physics, a restricted domain of validity, which leads to problems when applied outside this domain.

Devon Bowen

Filip Wojcieszyn