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Letter: Quantum entanglement we can understand

Published 29 March 2017

From Brian Horton, West Launceston, Tasmania, Australia

Stuart Clark suggests that quantum weirdness is like you and I starting together before parting, then as soon as one of us finds we have odd socks we know that the other, now a long way away, also has odd socks (4 March, p 28). This all makes perfect sense to me.

Imagine we start off with two red and two green socks between us. We become entangled in a dark room, then put on our socks and go our separate ways. As soon as an observer notices I have one red and one green sock, she knows instantly what colour socks you are wearing.

Since this example is so clear, does it mean that I now fully understand quantum theory, or does it mean the analogy is not quite adequate?

Issue no. 3119 published 1 April 2017

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