We show theoretically that a lattice of exciton-polaritons can behave as a
life-like cellular automaton when simultaneously excited by a continuous wave
coherent field and a time-periodic sequence of non-resonant pulses. This
provides a mechanism of realizing a range of highly sought spatiotemporal
structures under the same conditions, including: discrete solitons, oscillating
solitons, rotating solitons, breathers, soliton trains, guns, and choatic
behaviour. These structures can survive in the system indefinitely, despite the
presence of dissipation, and allow universal computation.Comment: 6 pages, 5 figure
