Thomas Jennewein, IQC
Yutaka Shikano, Tokyo Institute of Technology & Paul Skrzypczyk, University of Bristol
Robert Raussendorf, University of British Columbia
Given two elliptic curves over a finite field having the same cardinality and endomorphism ring, it is known that the curves admit an isogeny (a.k.a. algebraic map) between them, but finding such an isogeny is believed to be computationally difficult. The fastest known classical algorithm for this problem requires exponential time, and prior to our work no faster quantum algorithm was known. We show that this problem can be solved in subexponential time on a quantum computer, assuming the
IQC/QuantumWorks Joint Seminar Eric Luvisotto and Scott Inwood, Waterloo Commercialization Office (”WatCo”)
Patrick Hayden, McGill
Kristan Temme and Maris Ozols will be speaking at this Physics lunch seminar.
Approximation algorithms for classical constraint satisfaction problems are one of the main research areas in theoretical computer science. A natural generalization of constraint satisfaction problems to the quantum setting is the local Hamiltonian problem, which is of significant interest to both complexity theorists and to physicists studying properties of physical systems alike. In this talk, we define a natural approximation version of the local Hamiltonian problem and initiate its study. We present two main results.
Mike Geller, University of Georgia
Seth Lloyd, Massachusetts Institute of Technology
Ever since Einstein, physicists have argued about whether time travel is consistent with the laws of physics, and, if so, how it might be accomplished. This talk presents a new theory of time travel based on quantum teleportation. Unlike previous theories, the theory can be tested experimentally. I report on an experimental realization of the 'grandfather paradox': we send a photon a few billionths of a second backwards in time and have it try to 'kill' its previous self.