SC²S Colloquium - July 21, 2010

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Date: July 21
Room: 02.07.023
Time: 16:00 pm, s.t.

Javier Enciso: Tensor Contraction Schemes for 2D Problems in Quantum Simulation

The computation of the ground state, i.e. the eigenvector related to the smallest eigenvalue, plays a key role in quantum simulation. In the variational ansatz, the computation of the smallest eigenvalue leads to the minimization of the Rayleigh quotient. As the problem size grows exponentially in the number of particles one has to look for appropriate representations, which allow efficient computations of matrix-vector products as well as inner products.

In this talk, the speaker will present contraction schemes for the efficient computation of inner products. By usage of these approaches we will be able to tackle problems of higher dimensions efficiently.

Daniel Kleine-Albers: Exascale Computing Technology Challenges

The talk starts with a review of the changes Exascale Computing involves, in particular the much higher level of instructions per second and the increased level of parallelism within the nodes. It then moves on to the challenges that arise from these changes, especially the energy consumption and the bandwidth limitations of interconnects. The last part contains some possible solutions including a different approach to chip design as well as new optical switches to be used for interconnection.