From Paul Bracey
Hans Christian von Baeyer’s piece on the bit and its place in quantum physics
(17 February, p 26),
points out that “The simplest [questions] have yes-or-no
answers: ‘Did the photon arrive here, or not?'”
In fact, the answer to this question is always “yes”, since the photon will
always either arrive or not. The actual “yes/no” question is simply: “did the
photon arrive here?”
Also, it seems to me that the existence of many interpretations of quantum
theory, only one of which (one supposes) will turn out to be the right one, is
itself a very “quantum” phenomenon.
London
