Highly Efficient Coherent Optical Memory Based on Electromagnetically Induced Transparency.

Quantum memory is an important component in the long-distance quantum communication based on the quantum repeater protocol. To outperform the direct transmission of photons with quantum repeaters, it is crucial to develop quantum memories with high fidelity, high efficiency and a long storage time. Here, we achieve a storage efficiency of 92.

Absolute frequency of cesium 6S-6D hyperfine transition with a precision to nuclear magnetic octupole interaction.

We have determined the fundamental frequency of the cesium atom 6S-6D two-photon transition, for the first time, to our knowledge. Moreover, our high-resolution scheme made it possible to address the influence of the nuclear magnetic octupole on the hyperfine structure. We found that the octupole-interaction hyperfine constant deduced from the cesium 6D-level has a value nearly eight times larger than what has been deduced from the 6P-level.

Coherence properties of amplified slow light by four-wave mixing.

We present an experimental study of the coherence properties of amplified slow light by four-wave mixing (FWM) in a three-level electromagnetically induced transparency (EIT) system driven by one additional pump field. High energy gain (up to 19) is obtained with a weak pump field (a few mW/cm2) using optically dense cold atomic gases. A large fraction of the amplified light is found to be phase incoherent to the input signal field.

In vivo effects of Ginkgo biloba extract on interleukin-6 cytokine levels in patients with neurological disorders.

Objective: To evaluate the effect of Ginkgo biloba extract (EGB) on the serum levels of cytokines in patients suffering from chronic, age-related neurological disorders (NDs).

Materials And Methods: Patients received 9.6 mg of EGB twice daily for 8 weeks.

Creation of arbitrary spectra with an acousto-optic modulator and an injection-locked diode laser.

We use a double-passed acousto-optic modulator (AOM), driven by an arbitrary waveform generator to produce multiple frequency components for a laser with arbitrary frequency spacings. A programmed sequence containing various sections of radio-frequency sinusoidal signal at different frequency is applied to drive the AOM. The diffracted light is used to injection-lock a diode laser.