Patent ID: 8259377
Filing Date: 2012-09-04
Classification: G02F,H04Q

Abstract:
1. A method for operating a logical gate using at least one or more delayed optical routers comprising a nonlinear optical medium, wherein the nonlinear optical medium comprises two closely spaced ground states such that a transition between the two ground states is dipole forbidden, and an excited state such that two-photon transitions between the two ground states via the excited state are allowed, the method comprising: using at least one of a slow light (S) and a nondegenerate four-wave mixing signal (D) as a result of Boolean algebra, wherein the slow light (S) is appeared by applying, to the nonlinear optical medium, a first laser beam (P) with a first frequency corresponding to a first transition between a first ground state of the two ground states and the excited state and a second laser beam (C) with a second frequency corresponding to a second transition between a second ground state of the two ground states and the excited state, and the nondegenerate four-wave mixing signal (D) is appeared by applying, to the nonlinear optical medium, the first laser beam (P) with the first frequency, the second laser beam (C) with the second frequency and a third laser beam (A) with a third frequency corresponding to the second transition, wherein two serial delayed optical routers are used for a Boolean AND algebra, the using at least one of a slow light (S) and a nondegenerate four-wave mixing signal (D) as a result of Boolean algebra includes: inputting two third laser beams (A) respectively into the two serial delayed optical routers as respective inputs of the Boolean AND algebra, inputting a first nondegenerate four-wave mixing signal (D), which is produced by a first delayed optical router of said two serial delayed optical routers, as a source of a first laser beam (P) of a second delayed optical router of the two serial delayed optical routers, and using a second nondegenerate four-wave mixing signal (D) that is produced by the second delayed optical router as the result of the Boolean AND algebra.