Stephen Paul King (firstname.lastname@example.org)
Fri, 19 Nov 1999 01:06:24 -0500
From: David Deutsch <email@example.com> Date (v1): Tue, 1 Jun 1999 18:06:54 GMT (261kb) Date (revised v2): Fri, 4 Jun 1999 15:29:03 GMT (261kb)
Comments: PostScript version now available: this http URL
All information in quantum systems is, notwithstanding Bell's theorem, localised. Measuring or otherwise interacting with a quantum system S has no effect on distant systems from which S is dynamically isolated, even if they are entangled with S. Using the Heisenberg picture to analyse quantum information processing makes this locality explicit, and reveals that under some circumstances (in particular, in Einstein-Podolski-Rosen experiments and in quantum teleportation) quantum information is transmitted through 'classical' (i.e. decoherent) information channels.
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