Quantum reflections and shunting of polariton condensate wave trains: Implementation of a logic and gate

We study the dynamics of polariton condensate wave trains that propagate along a quasi-one-dimensional waveguide. Through the application of tuneable potential barriers the propagation can be reflected and multiple reflections used to confine and store a propagating state. Energy-relaxation processes allow the delayed relaxation into a long-living coherent ground state. Aside the potential routing of polariton condensate signals, the system forms an AND-type logic gate compatible with incoherent inputsC.A. and J.C. acknowledge financial support from a Spanish FPU scholarship and Marie Curie Project, respectively. P.S. acknowledges Greek GSRT program "ARISTEIA" (1978) and EU ERC "Polaflow" for financial support. Partial support was also obtained from the Spanish MEC MAT2011-22997, CAM (S-2009/ESP-1503) and FP7 ITN's "Clermont4" (235114), "Spin-optronics" (237252) and INDEX (289968) project