Here are the details of the next Q+ hangout.

Date/time: Tuesday 18th June 2013 2pm BST/UTC+1

Speaker: Bill Wootters (Williams College)

Title: What is the origin of complex probability amplitudes?

Abstract: I begin this presentation with an attempt to explain the origin of probability amplitudes in quantum theory, but the explanation makes sense only if those amplitudes are real. This result provides motivation for studying the real-vector-space variant of quantum theory. I show how a particular model within real-vector-space quantum theory can produce the appearance of complex probability amplitudes. In this model, a special binary subsystem of the universe, called the universal rebit or “ubit,” plays the role of the complex phase factor. In a certain limit the effective theory emerging from the model mimics standard quantum theory, but if we stop short of this limit the model predicts the spontaneous decoherence of isolated systems.

To watch the talk live go to http://gplus.to/qplus at the appointed hour.

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I missed Wooters. Is there a copy of his talk somewhere? There is one that is similar on youtube: http://www.youtube.com/watch?v=rzMkoeb6nHg

The video of Wootters’ talk is available at http://youtu.be/QHhaZMH_PB0

In general, you can find videos of previous Q+ talks at https://sites.google.com/site/plusquant/videos-of-previous-talks where you will also usually find a copy of the speaker’s slides as well.

See Wooters at

http://pirsa.org/displayFlash.php?id=12050007