Stephen Wolfram's: A New Kind of Science | Online
Jump to Page
Look Up in Index

Chapter 7 Notes > Section 3 > Page 970 > Note (a) Previous note-----Next note
Notes for: Mechanisms in Programs and Nature | Randomness from the Environment

*Quantum randomness

It is usually assumed that even if all else fails a quantum process such as radioactive decay will yield perfect randomness. But in practice the most accurate measurements show phenomena such as 1/f noise, presumably as a result of features of the detector and perhaps of electromagnetic fields associated with decay products. Acceptable randomness has however been obtained at rates of tens of bits per second. Recent attempts have also been made to produce quantum randomness at megahertz rates by detecting paths of single photons. (See also page 1064.)


Page image


Pages related to this note:


All notes on this page:

* Electronic randomness
* Quantum randomness
* Randomness in computer systems
* Randomness in biology
* Spinning and tossing [as sources of randomness]
* All notes for this section
* Downloadable programs for this page
* Downloadable images
* Search Forum for this page
* Post a comment
* NKS | Online FAQs
From Stephen Wolfram: A New Kind of Science [citation] Previous note-----Next note