München 2004 – scientific programme
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Q: Quantenoptik und Photonik
Q 23: Quanteninformation II
Q 23.2: Talk
Tuesday, March 23, 2004, 16:45–17:00, HS 101
Quantum phase gate using slow polaritons in optical lattices — •Marius Masalas1,2 and Michael Fleischhauer1 — 1Technische Universität Kaiserslautern, Germany — 2Institute of Theoretical Physics and Astronomy, Vilnius University, Lithuania
The quantum state of light propagating in a medium with electromagnetically induced transparency can be mapped onto a matter wave. Using elastic collisions between atoms and slow light techniques one can produce a large and controllable nonlinearity enhanced by an optical lattice. This nonlinearity may be used for a quantum phase gate. The collision problem of two polariton pulses, each containing a single excitation is solved analitically and it is shown that it is possible to achieve phase shift of order of π. The influence of degrading processes such as losses is also discussed.