Claude Shannon

Wednesday, April 26th, 2017

Room 202 in Packard Bldg., Stanford University
Parking Generally Free In Nearby Lots After 4:00 pm

Refreshments and Conversation at 6:00 P.M.
Presentation at 6:30 P.M.

Please register here

Spacetime replication of continuous variable quantum information

Grant Salton
PhD Candidate, Stanford Institute for Theoretical Physics


Are there fundamental restrictions on the flow of information through space and time? What about the flow of quantum information? It is well known that no information can be transmitted faster than light, and it is also known that quantum information cannot be cloned or copied arbitrarily. These two "laws" place restrictions on the transmission of information through spacetime, but are there other limitations? The answer is no: the only such restrictions are (1) no-signalling (faster- than-light communication), and (2) no-cloning of quantum information. This talk will first provide a brief introduction to some fundamentals of quantum information theory (including the no-cloning theorem and quantum error correction), and then will show that any process that transmits information through spacetime without violating (1) or (2) is physically realizable as a so-called spacetime information replication task. In particular, this talk will describe how one can succeed at distributing information in seemingly impossible ways using quantum error correction, and it will showcase new, continuous variable quantum error correcting codes that can efficiently replicate information in spacetime. If time permits, a proposal will be outlined for an optical experiment to realize information replication in the lab.


Photo of Grant Salton Grant Salton is a PhD candidate at the Stanford Institute for Theoretical Physics. His research interests include quantum information theory and quantum gravity, and he is particularly interested in questions at the intersection of the two fields. Grant is a Canadian physicist, with a bachelor's degree from the University of Waterloo, Waterloo, Ontario, and master's degrees from McGill University, Montreal, Quebec and Stanford. He joined the Stanford community in 2013.



  • Grant Salton
  • Website
  • eMail:grant[at]gsalton[d0t]com

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