Developing the Deutsch-Hayden approach to quantum mechanics

Details Developing the Deutsch-Hayden approach to quantum mechanics Developing the Deutsch-Hayden approach to quantum mechanics

2006-09-12

arxiv.org/abs/quant-ph/0609085v3

New Journal of Physics 9 No. 5 135 (2007)

Physics

Quantum Physics

14 pages. Added section on entanglement swapping

Scientific paper

10.1088/1367-2630/9/5/135

The formalism of Deutsch and Hayden is a useful tool for describing quantum mechanics explicitly as local and unitary, and therefore quantum information theory as concerning a "flow" of information between systems. In this paper we show that these physical descriptions of flow are unique, and develop the approach further to include the measurement interaction and mixed states. We then give an analysis of entanglement swapping in this approach, showing that it does not in fact contain non-local effects or some form of superluminal signalling.

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