Manipulation of quantum interference requires that the system under control remains coherent, avoiding (or at least postponing) the phase randomization that can ensue from coupling to an uncontrolled environment. We show that closed-loop coherent control can be used to mitigate the rate of quantum dephasing in a gas-phase ensemble of potassium dimers (K2),… (More)
We study and demonstrate a version of spectral phase interferometry for direct electric-field reconstruction (SPIDER) that uses self-referencing homodyne detection. This technique has a higher sensitivity than conventional SPIDER, is self-calibrating, and can be adjusted for a wider range of pulse parameters.
We demonstrate tightly confined interactions with Rb atoms on a chip of silicon nitride nanowires. Optical depths of 2 are observed, and absorption spectroscopy reveals strong effects of transit-time broadening and Van der Waals shifts.
We show 40% all-optical modulation with 1 nW total power via non-degenerate two-photon absorption in Rb vapor confined to a photonic bandgap fiber. This corresponds to 12 photons of switching energy.
We demonstrate an all-optical method for characterizing ultrafast pulses by differential tomography, using four-wave mixing. The technique is used to measure dispersion for various lengths of silica fiber.