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Tuesday, October 19, 2010 12:00 pm - 1:00 pm EDT (GMT -04:00)

Nathan Wiebe: Quantum Computer Simulations of Time Dependent Hamiltonians

Nathan Wiebe, University of Calgary

We introduce an efficient quantum algorithm for simulating time-dependent Hamiltonian quantum dynamics on a quantum computer and accounts fully for all computational resources, especially the per-qubit oracle query cost, which has been previously regarded as constant cost per query regardless of the number of qubits accessed.

Thursday, November 4, 2010 12:00 pm - 1:00 pm EDT (GMT -04:00)

Seth Lloyd: Sending a photon backwards in time

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.