All-Optical Switching in Hot Atoms With Standing-Wave Drive

We propose a scheme of all-optical switching in hot inverse Y-type four-level atoms driven by a strong standing-wave (SW). Two optical blockades are induced by quantum coherence of the strong standing-wave field at individual wavelengths of two travelling-wave (TW) probe fields. The blockade at probe field 2 can be burst when probe field 1 becomes strong and saturated absorption takes effect under keeping two-photon resonance. So the first probe field can switch on or off the second probe field all-optically with different strength in hot standing-wave-dressed atoms. In the other hand, when the second probe field is resonant to the respective atomic transition to create EIT (electromagnetically induced transparency), the system can do one-order temporal differentiate calculation to the first probe field with Gaussian shape. The scheme has potential applications in all-optical transistor in quantum logical circuits.