🚀 go-pugleaf

pearson@angmar.llnl.gov (Peter Pearson) writes:
>An article by R. J. Glauber [1], who has a Harvard address and I gather
>is a highly respected authority in the field of quantum coherence theory,
>deals with exactly the question I asked. He quotes N. Herbert as proposing
>in 1982 [2] that a "laser gain tube" be used to "clone" the photon, making
>many duplicates identical to the original, thereby permitting detailed
>measurements. Glauber, after many pages of assertions and equations
>whose rigor and applicability I am not qualified to judge, but which
>are all explained down to a level tantalizingly close to intelligible,
>concludes that the amplifier will inevitably introduce just enough
>noise (from such things as spontaneous emission) to make sure I get no
>more information than I could have gotten from the original photon.


See also Zurek and Wootters A SINGLE QUANTUM CANNOT BE CLONED
in Nature 299 p802-3 (1982)
Quantum mechanics does NOT require faster than light travell despite
some remarks in the literature. IF the world were classical, then to
mimic quantum results one would (perhaps) need such faster than light
travell, but the world is not classical. ( It's like those people who
persist in believing that the moon is made up of green cheese, which
behaves in a strange manner when picked up by astronauts, so that it
looks like rock. Yes, if you grant the premise then the conclusion
follows but not every premise is valid). Quantum mechanics does not
require faster than light travel. It does however postulate a non-causal
( in the sense of insufficient cause) world, which some, including
Einstein found abhorent. (but then some find the idea of a round earth
abhorent as well.)