[Aspuru-Guzik group list] Re: Meeting on Wednesday

Dear all, In our group meeting here in Chemistry at Harvard we will have Ken Brown come and talk to us on Thursday at 5.30 PM in Room M114, Mallinckrodt, 12 Oxford street. You are all invited to come. How to get here: http://aspuru.chem.harvard.edu/People/Group%20contact%20information/ A link to our seminars page: http://aspuru.chem.harvard.edu/Seminars/ Ken's title and Abstract: Thursday, September 27th, 5.30 PM Ken Brown, Assistant Professor of Chemistry and Computer Science, Georgia Tech) Limitations of Quantum Simulation Examined by Simulating a Pairing Hamiltonian using Nuclear Magnetic Resonance. Quantum simulation uses a well-known quantum system to predict the behavior of another quantum system. Certain limitations in this technique arise, however, when applied to specific problems, as we demonstrate with a theoretical and experimental study of an algorithm to find the low-lying spectrum of a Hamiltonian. While the number of elementary quantum gates does scale polynomially with the size of the system, it increases inversely to the desired error bound, epsilon. Making such simulations robust to decoherence using fault-tolerance constructs requires an additional factor of 1/epsilon gates. These constraints are illustrated by using a three qubit nuclear magnetic resonance system to simulate a pairing Hamiltonian, following the algorithm proposed by Wu, Byrd, and Lidar. -- Alán Aspuru-Guzik Assistant Professor Department of Chemistry and Chemical Biology 12 Oxford Street Harvard University Cambridge, MA 02138 Tel: (617)384-8188 Group URL: http://aspuru.chem.harvard.edu