LSV Seminar
The LSV seminar takes place on Tuesday at 11:00 AM. The usual location is the conference room at Pavillon des Jardins (venue). If you wish to be informed by e-mail about upcoming seminars, please contact Stéphane Le Roux and Matthias Fuegger.
The seminar is open to public and does not require any form of registration.
Past Seminars
Quantum Digital Physics?
- Date
- Tuesday, June 20 2017 at 11:00AM
- Place
- Salle de Conférence (Pavillon des Jardins)
- Speaker
- Pablo Arrighi (LIF, Université Aix-Marseille)
The 60's 'Digital Physics' program advocates that space may be nothing but a grid, with each cell containing a bounded amount of bits of information, and the whole thing evolving in discrete time steps according to a local rule. Thus according to this somewhat reductionist view the universe is but a cellular automaton. At least two things are wrong with this picture. First, general relativity tells us that the space should at least be a graph, and that this graph should evolve under the local rule. Second, quantum theory tells us that the graph may well evolve into a quantum superposition of graphs, and that this overall evolution should be unitary. This suggests a 2020's 'Quantum Digital Physics' program modelling space as superpostions of graphs, and time-evolution as a unitary causal operator. A theorem shows that such time-evolutions take the form of a quantum circuit of finite depth.